IS Families/IS110 family

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General

IS110 was originally identified in 1985 in Streptomyces coelicolor A3(2) as an element present in a derivative of bacteriophage phiC31 carrying a selectable viomycin resistance gene. The phage was deleted for its attachment site and therefore unable to lysogenise its host. The presence of IS110 enabled the phage to integrate using homologous recombination with resident IS110 copies in the chromosome [1].

There are over 330 examples of IS110 family members from nearly 130 bacterial and archaeal species. The Tpases of several have been identified in various sequenced bacterial genomes although the ends of most of these elements have not been defined and are therefore not included in ISfinder. Members such as the Mycobacterium paratuberculosis-specific IS900 and IS901 and the Coxiella burnetti IS1111 [2] have been used as a highly specific marker for the precise strain identification (e.g. [3][4][5][6][7][8][9][10][11][12]).

The family includes two subgroups which, it has been suggested, may represent two distinct families [13][14]: IS110 and IS1111. Members of the IS1111 sub-group are distinguished from those of the IS110 group principally by the presence of small (7 to 17 bp) sub-terminal IRs (Fig.IS110.1). Perhaps one of the better studied is the IS110 group member, IS492, from Pseudomonas atalantica originally identified by its activity in extracellular polysaccharide production (eps): inactivating the gene by insertion and reactivating by excision [15][16].

Fig. IS110.1 Organization of IS110 and IS1111 groups and their transposase. Top. Organization of IS110 and IS1111 groups. The figure shows the subterminal inverted repeats typical if IS1111 group members (blue triangles) and their distance from the IS ends. Bottom. Organization of the IS110 DEDD transposase. The figure shows the constellation of the 4 residues, D, E, D and D towards the N-terminal part of the protein (Choi et al., 2003; Tobiason et al., 2001).

Members of the family carry a DEDD transposase and, at present is the only IS family known to encode this type of enzyme. DEDD transposases are related to the RuvC Holliday junction resolvase [17]. The Tpase is closely related to the Piv and MooV invertases from Moraxella lacunata / M. bovis [18][19] and Neisseria gonorrhoeae [20][21][22] (Fig.IS110.2). Piv catalyses inversion of a DNA segment permitting expression of a type IV pilin. Intriguingly, early studies revealed that the transposase of one IS, IS621, clustered within the piv clade (Fig.IS110.2 top) and the IS carries ends with similarities to those of the 26 bp pilin gene inversion sequences [20] (Fig.IS110.2 bottom). It should be noted that several piv-like genes (irg1-8 for invertase-related gene) have been identified in Neisseria gonorrhoeae strain FA1090 [22]. None could complement either the Moraxella lacunata Piv or IS492 transposase and inactivation of all eight genes and overexpression of one copy of each failed to show an effect on pilin variation, DNA transformation or repair. Furthermore, analysis of DNA flanking the coding sequences support the hypothesis that the Piv homologues are indeed transposases for two new IS110 family members, ISNgo2 and ISNgo3. ISNgo2 (irg3, 4, 5, 6 and 8) is present in multiple copies in N. gonorrhoeae while ISNgo3 (irg7 and also closely related to pivNM1) is found in single copy in N. gonorrhoeae and in duplicate copies Neisseria meningitidis [22]. However, neither has yet been formally shown to transpose. Care should therefore be exercised in distinguishing between IS110 family transposases and functional piv genes.

Fig. IS110.2 Relationship between IS110/IS1111 family transposases and the Piv site-specific recombinase. TOP. Piv genes: Shown in red : pivML (M34367, Moraxella lacunata ATCC17956, 969 aa); pivMB (M32345, Moraxella bovis EPP63, 969 aa); pivNG (U65994, Neisseria gonorrhoeae, 963 aa); pivNM1 (AE002505, Neisseria meningitidis MC58 ,957 aa); pivNM2 (AE002525, Neisseria meningitidis MC58, 951 aa); pivNM3 (AL162754, Neisseria meningitidis Z2491, 966 aa); pivEC (AB024946, Escherichia coli plasmid pB171, 828 aa); pivAB (AF282240, Acinetobacter sp. SE19, 975 aa); pivPC (AF011334, Pectobacterium chrysanthemi, 990 aa). ISs: Shown in orange (IS110) and blue (IS1111): IS621 (NC_009800, Escherichia coli ECOR28, 1,279 bp); IS110 (Y00434, Streptomyces coelicolor, 1,558 bp); IS116 (M31716, Streptomyces clavuligerus, 1,421 bp); IS117 (X15942, Streptomyces coelicolor, 2,527 bp); IS492 (M24471, Pseudomonas atlantica, 1,202 bp); IS900 (X16293, Mycobacterium paratuberculosis,1,451 bp); IS901 (X59272, Mycobacterium avium, 1,472 bp); IS902 (X58030, Mycobacterium avium, 1,470 bp); IS1000 (M33159, Thermus thermophilus HB8, 1,196 bp); IS1110 (Z23003, Mycobacterium avium, 1,457 bp); IS1111 (M80806, Coxiella burnetii, 1,450 bp); IS1328 (Z48244, Yersinia enterocolitica, 1,353 bp); IS1533 (M82880, Leptospira borgpetersenii, 1,464 bp); IS1547 (Y16254, Mycobacterium tuberculosis 9504, 1,346 bp); IS1594 (AF047044, Anabaena sp. PCC7120, 1,471 bp); IS1626 (AF071067, Mycobacterium avium, 1,418 bp); IS2112 (AF060871, Rhodococcus rhodochrous, 1,415 bp); IS4321 (U60777, Enterobacter aerogenes plasmid pR751, 1,347 bp); ISNme1143 (AL162755, Neisseria meningitidis Z2491, 1,143 bp); ISH2e (ISfinder: ISMtsp6, Methylobacterium sp.) (AE000092, Rhizobium sp. NGR23, 1,201 bp) (.); ISRm19 (AL603647, Sinorhizobium meliloti, 1,224 bp); ISC1190 (AE006641, Sulfolobus solfataricus P2, 1,187 bp); ISC1229 (AE006641, Sulfolobus solfataricus P2 1,229 bp); ISC1491 (AE006641, Sulfolobus solfataricus P2, 1,488 bp); ISSt1206 (ISfinder: ISSto5) (AP000985, Sulfolobus tokodaii 7, 1,206 bp); ISSt1232 (AP000985, Sulfolobus tokodaii 7, 1,232 bp); ISSt1492 (AP000985, Sulfolobus tokodaii 7, 1,492 bp). Tree was constructed using the neighbor joi-ing method. Scale bar is 0.1. Sequences marked with “??” are not presently available in ISfinder. BOTTOM. Comparison of the inversion recombination sequences of piv (invL and invR) with those of the left (LE and right (RE) end of IS629. The identities are shown in red. Bold CT dinucleotide at both ends indicates a possible 2 nucleotide DR. Data taken from Choi et al., 2003. andredrawn.

One major difference in the organization of IS110 family members and the inversion systems is that in the piv system, the recombinase is located outside the invertible segment, while in the IS110 family, it is located within the IS element [17].

Although the Tpases of the IS110 and IS1111 groups are very similar to each other, more detailed analysis shows that they generally separate into two distinct groups delineating the IS110 members from those of the IS1111 group (Fig.IS110.3) and a segment containing a mixture of both IS subgroups. It is possible that the few IS110 elements found within the IS1111 group and the IS1111 elements within the IS110 group have been misclassified.

Some family members have been reported to generate small Direct Repeats (DRs) while others do not. However, in most cases where flanking DR occur, the data can be interpreted to show that one DR copy is present in the target while the second copy belongs to the IS and is transmitted via a circular transposition intermediate suggesting that integration is sequence-targeted.


Fig. IS110.3. Transposase-based Phylogenetic Tree. All IS110/IS1111 family transposases available in ISfinder (06/2020) are shown. The blue segment indicates IS1111 group IS, the pale orange segment, IS110 group IS and the darker orange segment indicates a clade with a mixture of both. Small blue and pale orange circles show members of the IS1111 group located in the IS110 sector and of IS110 members in the IS1111 sector. Purple lozenges show those IS which have been observed to insert site-specifically into attC integron recombination sites and the green lozenges show IS which insert sire-specifically into REP sequences.


Organization

Members (Fig.IS110.4) vary between 1136 bp and 1558 bp, with most clustered in the 1450 bp size range. The length distribution of the IS110 group is more disperse than that of the IS1111 group. The organization of IS110 family members is quite different from that of IS with DDE transposases: they do not contain the typical terminal IRs of the DDE IS and do not generally generate flanking target DRs on insertion. This implies that their transposition occurs using a different mechanism to that of DDE IS. A single long, relatively well conserved, reading frame is present and shows some clusters of conservation within the N- and C-terminal portions. One characteristic which distinguishes IS110 family members from all other elements whose Tpases exhibit a predicted RNase fold is that the predicted catalytic domain of their DEDD Tpases is located N-terminal to the DNA binding domain [20][23] (Fig.IS110.1). In the DDE Tpases it is generally located downstream towards the C-terminal end of the protein. The alignment shown in Fig.IS110.5, based on 149 IS110 and 187 IS1111 group members, shows that the N-terminal catalytic domain of both IS110 and IS1111 groups share significant identities. The probable C-terminal DNA binding domains of the two groups vary somewhat from each other (Fig.IS110.6). Those of the IS1111 group show significant conservation compared with IS110 group members, perhaps reflecting the different types of ends carried by each group.

Fig. IS110.4. Length Distribution of IS110/IS1111 Family Members. All IS110/IS1111 family transposases available in ISfinder (06/2020) are shown. The number of IS in a given interval is shown at the top of each bin and the length, in base pairs, is shown at the bottom.


Fig. IS110.5. Alignment of the N-terminal catalytic domains of 149 IS110 and 187 IS1111 group transposases. Alignments were performed with Clustal omega using default settings and output used Jalview. Only a handful of alignments from the entire collection are shown. Conserved positions are indicated as different degrees of blue. The conserved positions and consensus sequences are shown below. Common DEDD motifs are indicated between the two panels.


Fig. IS110.6. Alignment of the C-terminal probable DNA binding domains of 149 IS110 and 187 IS1111 group transposases. Alignments were performed with Clustal omega using default settings and output used Jalview. Only a handful of alignments from the entire collection are shown. Conserved positions are indicated as different degrees of blue. The conserved positions and consensus sequences are shown below. The figure illustrates the high conservation of this domain in the IS1111 group


Mechanism

It has proved difficult to determine the activity of these Tpases in detail in vitro. Transposition of IS with DEDD Tpases may be unusual and involve Holliday Junctions (HJ) intermediates [24] which must be resolved using a RuvC-like mechanism [25]. This type of recombination would be consistent with the close relationship between DEDD Tpases and the Piv/MooV invertases which presumably resolve HJ structures during inversion [26]. The difference in domain organization between the DEDD and DDE Tpases reinforces the idea that the two IS types possess a different transposition mechanism.

Few data are available concerning enzymatic activities of the putative Tpases of this family of elements: the IS900 Tpase has been detected by immunological methods in the Mycobacterium paratuberculosis host [27] and IS492 Tpase has been purified and appears to exhibit DNA cleavage activity specific for the ends of the element (Perkins-Balding and Glasgow, pers. comm.) but there yet no published information.

However, several members of this family from both the IS110 and IS1111 groups produce double strand circular transposon intermediates (e.g. IS492:[28][29]; ISPa11 [14]; ISEc11 [30] ; IS117 [31][32]; IS1383 [33]. It should be noted that although, like other IS families, such circles are almost certainly transposition intermediates and, where examined, their formation requires transposase expression, IS110 family transposon circles could simply be generated by site-specific recombination rather than by the copy-out-paste-in mechanism adopted by families such as the IS3 family.

That the circles may be transposition intermediates was suggested by the observation that Streptomyces coelicolor IS117 was initially demonstrated in a circular form which integrates at a frequency two orders of magnitude higher than when cloned as a "linear" copy [31]. For IS117/IS116 (IS110) [31][34][35][36], IS492 (IS110) [28][37], IS1383 (IS1111) [33], ISEc11 (IS1111) [30], IS4321/IS5075 (IS1111) [14] and ISPa11 (IS1111) [14], DNA fragments carrying abutted IS ends were detected by PCR analysis in vivo and the structures confirmed by nucleotide sequencing. Their appearance was dependent on an intact Tpase gene and their nucleotide sequence is consistent with the formation of a circular form of the element.

Henderson et al, 1989[31] were perhaps the first to suggest that this family used site-specific recombination to transpose. IS117, originally identified as a “mini” circle shows a 2/3 base pair identity between the circle junction and its specific site of insertion into the host chromosome [31][34][35] (Fig.IS110.7). Transposition was often found to result in tandem dimer inserts, behavior which might indicate some type of rolling circle insertion mechanism such as observed in the case of the IS91 family elements.

Fig. IS110.7. IS117 (IS110) Insertion and Excision as a Circle. The left (LE) and right (RE) ends of the IS are indicated by horizontal blue arrows directed towards the inside of the IS. A) The empty chromosomal site in Streptomyces coelicolor is shown, with the target sequence indicated in red. (Leskiw et al 1990) B) The result of IS117 insertion with the flanking repeat shown in red. (Leskiw et al 1990) C) The circle junction which includes a single copy of the flanking sequence shown in red. (Henderson et al 1989). D) Secondary integration sites with conserved sequences, shown in red. (Smokvina and Hopwood 1993)

Another member of the IS110 group, IS492, clearly undergoes Tpase dependent precise excision to regenerate a functional eps gene in Pseudomonas atlantica (Fig.IS110.8 A). The inserted IS copy is flanked by 5 bp directly repeated sequences (5’-CTTGT-3’) (Fig.IS110.8 B). The circle junction carries a single copy of this sequence (Fig.IS110.8 C) as does the empty target site. This suggested that one copy is carried by the IS and is required for activity. Sequential deletion of the ends of (Fig.IS110.8 D) clearly showed that the pentanucleotide and/or sequences immediately upstream were required for excision. On the other hand, a sequence 5’-GTTT-3’ located upstream in those insertions analyzed (Fig.IS110.9) was not required for excision. It is possible that they are needed for circle integration.

Fig. IS110.8. IS492 (IS110) Excision as a Circle. The left (LE) and right (RE) ends of the IS are indicated by horizontal blue arrows directed towards the inside of the IS. A) The empty chromosomal site in Pseudomonas atlantica is shown with the target sequence indicated in red. B) The result of IS117 insertion with the flanking repeat shown in red. C) The circle junction, which includes a single copy of the flanking sequence shown in red. D) The effects of deletion towards the IS ends on circle formation (Perkins-Baldwin et al., 1999)
Fig. IS110.9. IS492 (IS110) Excision as a Circle. The left (LE) and right (RE) ends of the IS are indicated by horizontal blue arrows directed towards the inside of the IS. Independent insertions into a plasmid target. Conserved flanking sequences are shown in red. (Perkins-Baldwin et al., 1999)

Similar flanking sequences have also been identified in insertions of IS900, IS901, IS902, IS116, IS1110, and IS2112 (Fig.IS110.10) and IS621 was also shown to have a flanking sequence, in this case a dinucleotide, CT [20].

The ends of IS1111 group members differ from those of the IS110 group by including short subterminal IRs. IS1383 was identified as flanking insertions into each end of the IS5 family member, IS1384 [33][38] and was also shown to generate IS circle junctions (Fig.IS110.11 A). Like most members of this group, IRL is located further from the IS tip than is IRR. In this case IRL is preceded by the sequence 5’-agatgg-3’ (lower case indicates the IS end sequences upstream and downstream of IRL and IRR respectively). The insertions into the ends of IS1384 had occurred into a resident AG(A) sequence and excision to form the circle junction appeared to have occurred by recombination between the resident AG(A) and the terminal aga at the left end of IS1383 [33]. This this is compatible with a site-specific recombination mechanism in IS1383 transposition. A similar arrangement was observed for a second IS1111 group member, ISEc11 [30], where a flanking tetranucleotide AAAT also appeared as part of the circle junction (Fig.IS110.11 B) and it has also been argued that this is compatible with a site (sequence)-specific recombination transposition mechanism [30]. However, in two additional cases from the Hall lab, IS4321/IS5075 and ISPa11, no such “micro-homologies” were detected [14] (Fig.IS110.11 C and D). However, it should be noted that transposon circles are generated in vivo and analyzed by PCR. Since there may be a number of copies of the IS in the host genome, this might compromise the sequence of the PCR product.

The number of fully studied examples of IS1111 group members is limited, it is possible that the flanking “micro-homologies” observed for IS1383 and ISEc11 are chance occurrences and that excision and insertion of IS1111 members is truly mechanistically different from those of IS110 group members and that their division into separate families is justified.

Fig. IS110.10. Insertion Specificity of a Number of IS110 group Members. The left(LE) and right (RE) ends of the IS are boxed and in red. Flanking sequences at RE with total or partial identity to LE are also boxed and shown in red. The conserved sequence int the target upstream of LE is boxed, underlined, and bold. Where available the empty target sequence is shown on the far left. The publications from which the data have been extracted are Green et al 1989 and Doran et al., 1997 (IS900), Kunze et al., 1991 (IS901), Moss et al., 1992 (IS902), Hernandez Perez, et al., 1994 (IS1110), Leskiw et al., 1990 (IS116), Puyang, et al., 1999 (IS1626) and Kulakov, et al., 1999 (IS2112).


Fig. IS110.11. The subterminal inverted repeats IRL and IRR are in uppercase, and the IS sequences external to these in lowercase. A) IS1383 insertion sites and circle junction (Muller et al., 2001; Lauf et al., 1999). The left end sequence similar to that flanking the right end is shown in the circle junction as lowercase bold red. B) ISEc11 insertion site and circle junction (Prosseda et al., 2006). The left end sequence similar to that flanking the right end is shown in the circle junction as lowercase bold red. C) IS4321/IS5075 insertion site and circle junction (Partridge and Hall, 2003). There is no similarity between the left end and the sequences flanking the right end. D) ISPa11 insertion site and circle junction (Partridge and Hall, 2003). There is no similarity between the left end and the sequences flanking the right end.


Transient Promoter Formation: the circle junction

Like many other IS which use double strand circular intermediates, circle formation results in the assembly of a junction promoter formed from a -35 promoter element in the right end oriented outwards and a -10 promoter element in the left end oriented inwards [39][40][41]. For the IS110 family, this was originally identified in circular forms of IS492 [28] (Fig.IS110.12). A list compiled of many IS1111 group IS [14] and in silico construction of IS circle junctions indicated that all had the capacity to generate probable promoters. Due to small variations in the distance of the subterminal IRs from the probable end of the IS, some were separated by 10 bp and some by 9 bp. A notable observation is that while the -35 promoter elements are located entirely within the right IS end, the -10 promoter element was not located entirely within the left end but was composed of sequences from both the left and right ends and was only assembled on circle formation. However, unlike the IS492 junction promoter which appears to be significantly stronger than the lacUV5 promoter [28] and the junction promoters of ISEc11 and a naturally occurring derivative, ISEc11p which are also functional [30], few of these have been examined for activity.

Fig. IS110.12. Transitory promoter assembly at IS1111 family circle junctions. -35 and -10 promoter elements are shown in pink and green boxes respectively, and the subterminal IRs are labeled in pale yellow. Top: IS492 (IS110) was the first of this family to be shown to create a functional promoter (Perkin-Baldwin et al., 1999) Below: A compiled list of IS1111 ends assembled into circle junctions. (data from Partridge and Hall, 2003) Most of these have been assembled in silico but those with published sequenced junctions are marked with a blue circle.
Insertion specificity and target secondary structures

The particular insertion specificities of the IS110 family has been mentioned in the context of the mechanism of transposition and is often one factor in making definition of the IS ends difficult. However, one characteristic of insertion of this family of IS is that they prefer sequences with the propensity to form secondary structures. This is consistent with the fact that the transposases are similar to the RuvC and the RuvC endonuclease is involved in resolving branched Holliday junctions during recombination (e.g.[42]).

For example, IS621 insertions were observed to be flanked by a CT dinucleotide [20]. On further examination this was shown to be a dinucleotide located at the foot of Rep sequences in the host Escherichia coli genome (Fig.IS110.13 A). REP sequences are small Repeated Extragenic Palindromic sequences often present in many hundreds of copies in bacterial genomes and which play a variety of structural and regulatory roles [43][44][45][46][47][48][49]. Both Z1 and Z2 Rep [44][45][46] sequences are used as targets and all 10 copies of IS621 in the E. coli ECO28 genome were found in this position in resident Rep sequences [20].

There are at least six other examples of this type of “structural” insertion specificity (Fig.IS110.2). All 8 copies of ISPpu10 were identified in short REP sequences of Pseudomonas putida KT2440 [50][51] and a cloned ISPpu10 derivative was shown experimentally to transpose into this REP target [50] (Fig.IS110.13 B). Eight (of 8) copies of a related IS, ISPup9, were identified in the same REP sequence at the same position but inserted in the opposite orientation (i.e. on the opposite strand)[52] (Fig.IS110.13 B) while 4/4 examples of ISRm19 were identified in a REP sequence of Rhizobium meliloti (Fig.IS110.13 C). Similarly, ISPa11 of the IS1111 group inserts specifically into a Pseudomonas aeruginosa REP (6 examples) [52] and one example from Partridge and Hall (2003)[14] (Fig.IS110.13 D).

Two types of Insertion have been described [52] are of two types. In type 1, the IS inserts at the same position within the REP whereas type 2 insertions occur adjacent to a REP. Most IS110 family members exhibit type I insertion patterns in all examples identified. However, one IS, ISPsy7 exhibited type II insertion pattern but only in 6/10 examples and a second unspecified IS from Neisseria meningitidis MC58 was also reported to exhibit a type II pattern in 3/5 cases examined [52]. It is possible that this N. meningitidis IS is the same as that described by Skaar et al. [22].

Fig. IS110.13. IS1111 group insertion into REP sequences. Arrows indicate the insertion point. Sequences found at the left and right ends are circled in red. A) IS621 (IS110) Insertion into two REP derivatives Z1 and Z2 as defined by Bachellier et al., 1993 and 1994 (data from Choi et al 2003) B) ISPpu9/ISPpu10 (IS110). Both strands are shown. Each IS inserts into the same position but in opposite orientations. (data from Ramos-Gonzalez et al 2006 and Tobes and Pareja 2006) C) ISRm19 (IS110) (data from Tobes and Pareja 2006) D) ISPa11 (IS1111). Note that there are no sequence similarities between the left and those flanking the right end. (data from Tobes and Pareja 2006 and Partridge and Hall 2003)


At least six different members of the IS1111 subgroup (ISKpn4, ISPa21, ISPst6, ISUnCu1 = ISPa62, ISAvX1 = ISAzvi12 and ISPa25) show a preference for another type of target which can assume structured a configuration, the attC sequences of integrons [53][54]. IS which insert into attC sequences are grouped into a specific clade (Fig.IS110.2) [53]. The integron attC is central to integration of circular integron cassettes [55] and had been called “59 base pair element” [56] but can vary considerably in length [57]. Studies from the Mazel lab have shown that attC sequences form foldback structures (Fig.IS110.14 A) with imperfect matches in which extrahelical bases are involved in driving the direction of the excision and integration reactions [55][57][58][59]. Integration of IS1111 group members appears to occur at a specific position on these attC foldback sequences (Fig.IS110.14 B).

Other IS of this family also appear to insert into conserved target sequences: IS1533 occurs in 84 copies in Leptospira borgpetersenii and inserts into a partially conserved sequence (ttAGACAAAA [IS1533] TATCAGagcc-gtct--aaa); ISRfsp2 from Roseiflexus sp RS-1, present in 40 copies in the host genome, is flanked by the sequence, CTCtGCGaaCGCtGCGc [ISRfsp2] CTCtGCGGtg (Fig.IS110.15) while ISMpa1 from Mycobacterium avium subsp. Paratuberculosis is flanked by the consensus CCAGN0–1CTA [ISMpa1] GCCN0–6GCCG [60].


Fig. IS110.14A. IS1111 group insertion into attC sites. Top: The secondary structures shown have been functionally and structurally identified by the Mazel group (Bouvier et al. 2005; MacDonald et al., 2006; Bouvier et al. 2009). The nomenclature of the repeat sequences are those used by these authors, since this reflects their position in the folded structure. Extra helical bases that are important in regulating the attC-attI recombination process are highlighted in green. The figure underlines the large variation in the length of attC as a result of “linker” DNA located between L’ and L’’.
Fig. IS110. 14B. The position of insertion of different IS1111 group IS in a number of different attC sequences. The genes or identifier to which the particular attC sequence is attached are noted to the left of the figure. The names of the inserted IS are shown on the right. Data from Partridge and Hall 2003 show the complete attC sequence. Those from Tetu and Holmes 2003 show only the left (5’) region.


Fig.IS110.15. An example of a high copy number IS110 group member, ISRfsp2 in the Roseiflexus sp. RS-1 Genome. A map localising the IS on the sequenced genome is shown on the left. The alignment of the insertion sites is shown on the right.


Bibliography

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  13. ↑ Partridge SR, Hall RM . The IS1111 family members IS4321 and IS5075 have subterminal inverted repeats and target the terminal inverted repeats of Tn21 family transposons. - J Bacteriol: 2003 Nov, 185(21);6371-84 [PubMed:14563872] [DOI]
  14. ↑ 14.0 14.1 14.2 14.3 14.4 14.5 14.6 Lauf U, Müller C, Herrmann H . Identification and characterisation of IS1383, a new insertion sequence isolated from Pseudomonas putida strain H. - FEMS Microbiol Lett: 1999 Jan 15, 170(2);407-12 [PubMed:9933934] [DOI]
  15. ↑ Bartlett DH, Wright ME, Silverman M . Variable expression of extracellular polysaccharide in the marine bacterium Pseudomonas atlantica is controlled by genome rearrangement. - Proc Natl Acad Sci U S A: 1988 Jun, 85(11);3923-7 [PubMed:16593937] [DOI]
  16. ↑ Bartlett DH, Silverman M . Nucleotide sequence of IS492, a novel insertion sequence causing variation in extracellular polysaccharide production in the marine bacterium Pseudomonas atlantica. - J Bacteriol: 1989 Mar, 171(3);1763-6 [PubMed:2537827] [DOI]
  17. ↑ 17.0 17.1 Buchner JM, Robertson AE, Poynter DJ, Denniston SS, Karls AC . Piv site-specific invertase requires a DEDD motif analogous to the catalytic center of the RuvC Holliday junction resolvases. - J Bacteriol: 2005 May, 187(10);3431-7 [PubMed:15866929] [DOI]
  18. ↑ Fulks KA, Marrs CF, Stevens SP, Green MR . Sequence analysis of the inversion region containing the pilin genes of Moraxella bovis. - J Bacteriol: 1990 Jan, 172(1);310-6 [PubMed:2403542] [DOI]
  19. ↑ Rozsa FW, Meyer TF, Fussenegger M . Inversion of Moraxella lacunata type 4 pilin gene sequences by a Neisseria gonorrhoeae site-specific recombinase. - J Bacteriol: 1997 Apr, 179(7);2382-8 [PubMed:9079926] [DOI]
  20. ↑ 20.0 20.1 20.2 20.3 20.4 20.5 Choi S, Ohta S, Ohtsubo E . A novel IS element, IS621, of the IS110/IS492 family transposes to a specific site in repetitive extragenic palindromic sequences in Escherichia coli. - J Bacteriol: 2003 Aug, 185(16);4891-900 [PubMed:12897009] [DOI]
  21. ↑ Lenich AG, Glasgow AC . Amino acid sequence homology between Piv, an essential protein in site-specific DNA inversion in Moraxella lacunata, and transposases of an unusual family of insertion elements. - J Bacteriol: 1994 Jul, 176(13);4160-4 [PubMed:8021196] [DOI]
  22. ↑ 22.0 22.1 22.2 22.3 Skaar EP, Lecuyer B, Lenich AG, Lazio MP, Perkins-Balding D, Seifert HS, Karls AC . Analysis of the Piv recombinase-related gene family of Neisseria gonorrhoeae. - J Bacteriol: 2005 Feb, 187(4);1276-86 [PubMed:15687191] [DOI]
  23. ↑ Tobiason DM, Buchner JM, Thiel WH, Gernert KM, Karls AC . Conserved amino acid motifs from the novel Piv/MooV family of transposases and site-specific recombinases are required for catalysis of DNA inversion by Piv. - Mol Microbiol: 2001 Feb, 39(3);641-51 [PubMed:11169105] [DOI]
  24. ↑ Duckett DR, Murchie AI, Diekmann S, von Kitzing E, Kemper B, Lilley DM . The structure of the Holliday junction, and its resolution. - Cell: 1988 Oct 7, 55(1);79-89 [PubMed:3167979] [DOI]
  25. ↑ Ariyoshi M, Vassylyev DG, Iwasaki H, Nakamura H, Shinagawa H, Morikawa K . Atomic structure of the RuvC resolvase: a holliday junction-specific endonuclease from E. coli. - Cell: 1994 Sep 23, 78(6);1063-72 [PubMed:7923356] [DOI]
  26. ↑ Tobiason DM, Lenich AG, Glasgow AC . Multiple DNA binding activities of the novel site-specific recombinase, Piv, from Moraxella lacunata. - J Biol Chem: 1999 Apr 2, 274(14);9698-706 [PubMed:10092658] [DOI]
  27. ↑ Tizard ML, Moss MT, Sanderson JD, Austen BM, Hermon-Taylor J . p43, the protein product of the atypical insertion sequence IS900, is expressed in Mycobacterium paratuberculosis. - J Gen Microbiol: 1992 Aug, 138 Pt 8;1729-36 [PubMed:1326596] [DOI]
  28. ↑ 28.0 28.1 28.2 28.3 Perkins-Balding D, Duval-Valentin G, Glasgow AC . Excision of IS492 requires flanking target sequences and results in circle formation in Pseudoalteromonas atlantica. - J Bacteriol: 1999 Aug, 181(16);4937-48 [PubMed:10438765] [DOI]
  29. ↑ Higgins BP, Carpenter CD, Karls AC . Chromosomal context directs high-frequency precise excision of IS492 in Pseudoalteromonas atlantica. - Proc Natl Acad Sci U S A: 2007 Feb 6, 104(6);1901-6 [PubMed:17264213] [DOI]
  30. ↑ 30.0 30.1 30.2 30.3 30.4 Prosseda G, Latella MC, Casalino M, Nicoletti M, Michienzi S, Colonna B . Plasticity of the P junc promoter of ISEc11, a new insertion sequence of the IS1111 family. - J Bacteriol: 2006 Jul, 188(13);4681-9 [PubMed:16788177] [DOI]
  31. ↑ 31.0 31.1 31.2 31.3 31.4 Henderson DJ, Lydiate DJ, Hopwood DA . Structural and functional analysis of the mini-circle, a transposable element of Streptomyces coelicolor A3(2). - Mol Microbiol: 1989 Oct, 3(10);1307-18 [PubMed:2575701] [DOI]
  32. ↑ Smokvina T, Henderson DJ, Melton RE, Brolle DF, Kieser T, Hopwood DA . Transposition of IS117, the 2.5 kb Streptomyces coelicolor A3(2) 'minicircle': roles of open reading frames and origin of tandem insertions. - Mol Microbiol: 1994 May, 12(3);459-68 [PubMed:8065263] [DOI]
  33. ↑ 33.0 33.1 33.2 33.3 Müller C, Lauf U, Hermann H . The inverted repeats of IS1384, a newly described insertion sequence from Pseudomonas putida strain H, represent the specific target for integration of IS1383. - Mol Genet Genomics: 2001 Aug, 265(6);1004-10 [PubMed:11523772] [DOI]
  34. ↑ 34.0 34.1 Henderson DJ, Brolle DF, Kieser T, Melton RE, Hopwood DA . Transposition of IS117 (the Streptomyces coelicolor A 3 (2) mini-circle) to and from a cloned target site and into secondary chromosomal sites. - Mol Gen Genet: 1990 Oct, 224(1);65-71 [PubMed:2177525] [DOI]
  35. ↑ 35.0 35.1 Smokvina T, Hopwood DA . Analysis of secondary integration sites for IS117 in Streptomyces lividans and their role in the generation of chromosomal deletions. - Mol Gen Genet: 1993 May, 239(1-2);90-6 [PubMed:8389980] [DOI]
  36. ↑ Leskiw BK, Mevarech M, Barritt LS, Jensen SE, Henderson DJ, Hopwood DA, Bruton CJ, Chater KF . Discovery of an insertion sequence, IS116, from Streptomyces clavuligerus and its relatedness to other transposable elements from actinomycetes. - J Gen Microbiol: 1990 Jul, 136(7);1251-8 [PubMed:1700062] [DOI]
  37. ↑ Higgins BP, Popkowski AC, Caruana PR, Karls AC . Site-specific insertion of IS492 in Pseudoalteromonas atlantica. - J Bacteriol: 2009 Oct, 191(20);6408-14 [PubMed:19684137] [DOI]
  38. ↑ Lauf U, Müller C, Herrmann H . Identification and characterisation of IS1383, a new insertion sequence isolated from Pseudomonas putida strain H. - FEMS Microbiol Lett: 1999 Jan 15, 170(2);407-12 [PubMed:9933934] [DOI]
  39. ↑ Duval-Valentin G, Normand C, Khemici V, Marty B, Chandler M . Transient promoter formation: a new feedback mechanism for regulation of IS911 transposition. - EMBO J: 2001 Oct 15, 20(20);5802-11 [PubMed:11598022] [DOI]
  40. ↑ Ton-Hoang B, Bétermier M, Polard P, Chandler M . Assembly of a strong promoter following IS911 circularization and the role of circles in transposition. - EMBO J: 1997 Jun 2, 16(11);3357-71 [PubMed:9214651] [DOI]
  41. ↑ Lyras D, Rood JI . Transposition of Tn4451 and Tn4453 involves a circular intermediate that forms a promoter for the large resolvase, TnpX. - Mol Microbiol: 2000 Nov, 38(3);588-601 [PubMed:11069682] [DOI]
  42. ↑ Fogg JM, Schofield MJ, White MF, Lilley DM . Sequence and functional-group specificity for cleavage of DNA junctions by RuvC of Escherichia coli. - Biochemistry: 1999 Aug 31, 38(35);11349-58 [PubMed:10471285] [DOI]
  43. ↑ He S, Corneloup A, Guynet C, Lavatine L, Caumont-Sarcos A, Siguier P, Marty B, Dyda F, Chandler M, Ton Hoang B . The IS200/IS605 Family and "Peel and Paste" Single-strand Transposition Mechanism. - Microbiol Spectr: 2015 Aug, 3(4); [PubMed:26350330] [DOI]
  44. ↑ 44.0 44.1 Bachellier S, Clément JM, Hofnung M, Gilson E . Bacterial interspersed mosaic elements (BIMEs) are a major source of sequence polymorphism in Escherichia coli intergenic regions including specific associations with a new insertion sequence. - Genetics: 1997 Mar, 145(3);551-62 [PubMed:9055066] [DOI]
  45. ↑ 45.0 45.1 Bachellier S, Perrin D, Hofnung M, Gilson E . Bacterial interspersed mosaic elements (BIMEs) are present in the genome of Klebsiella. - Mol Microbiol: 1993 Feb, 7(4);537-44 [PubMed:8459773] [DOI]
  46. ↑ 46.0 46.1 Bachellier S, Saurin W, Perrin D, Hofnung M, Gilson E . Structural and functional diversity among bacterial interspersed mosaic elements (BIMEs). - Mol Microbiol: 1994 Apr, 12(1);61-70 [PubMed:8057840] [DOI]
  47. ↑ Bachellier S, Clément JM, Hofnung M . Short palindromic repetitive DNA elements in enterobacteria: a survey. - Res Microbiol: 1999 Nov-Dec, 150(9-10);627-39 [PubMed:10673002] [DOI]
  48. ↑ Nunvar J, Huckova T, Licha I . Identification and characterization of repetitive extragenic palindromes (REP)-associated tyrosine transposases: implications for REP evolution and dynamics in bacterial genomes. - BMC Genomics: 2010 Jan 19, 11;44 [PubMed:20085626] [DOI]
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  50. ↑ 50.0 50.1 Ramos-González MI, Campos MJ, Ramos JL, Espinosa-Urgel M . Characterization of the Pseudomonas putida mobile genetic element ISPpu10: an occupant of repetitive extragenic palindromic sequences. - J Bacteriol: 2006 Jan, 188(1);37-44 [PubMed:16352819] [DOI]
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  52. ↑ 52.0 52.1 52.2 52.3 Tobes R, Pareja E . Bacterial repetitive extragenic palindromic sequences are DNA targets for Insertion Sequence elements. - BMC Genomics: 2006 Mar 24, 7;62 [PubMed:16563168] [DOI]
  53. ↑ 53.0 53.1 Tetu SG, Holmes AJ . A family of insertion sequences that impacts integrons by specific targeting of gene cassette recombination sites, the IS1111-attC Group. - J Bacteriol: 2008 Jul, 190(14);4959-70 [PubMed:18487340] [DOI]
  54. ↑ Post V, Hall RM . Insertion sequences in the IS1111 family that target the attC recombination sites of integron-associated gene cassettes. - FEMS Microbiol Lett: 2009 Jan, 290(2);182-7 [PubMed:19025573] [DOI]
  55. ↑ 55.0 55.1 Mazel D . Integrons: agents of bacterial evolution. - Nat Rev Microbiol: 2006 Aug, 4(8);608-20 [PubMed:16845431] [DOI]
  56. ↑ Hall RM, Brookes DE, Stokes HW . Site-specific insertion of genes into integrons: role of the 59-base element and determination of the recombination cross-over point. - Mol Microbiol: 1991 Aug, 5(8);1941-59 [PubMed:1662753] [DOI]
  57. ↑ 57.0 57.1 Bouvier M, Ducos-Galand M, Loot C, Bikard D, Mazel D . Structural features of single-stranded integron cassette attC sites and their role in strand selection. - PLoS Genet: 2009 Sep, 5(9);e1000632 [PubMed:19730680] [DOI]
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  59. ↑ MacDonald D, Demarre G, Bouvier M, Mazel D, Gopaul DN . Structural basis for broad DNA-specificity in integron recombination. - Nature: 2006 Apr 27, 440(7088);1157-62 [PubMed:16641988] [DOI]
  60. ↑ Olsen I, Johansen TB, Billman-Jacobe H, Nilsen SF, Djønne B . A novel IS element, ISMpa1, in Mycobacterium avium subsp. paratuberculosis. - Vet Microbiol: 2004 Mar 5, 98(3-4);297-306 [PubMed:15036538] [DOI]


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