Comparison of the conserved structure of streptococcal ICEs. ICE names or host strain names are mentioned on the right. ORFs location and orientation of each ICE are indicated by arrowed boxes. Above, ORF names are abbreviated with the corresponding letter or number. The pattern of the arrowed boxes depicts the related ORFs, homologs to ICESt3 regulation and conjugation genes deduced from functional analyses or from BLAST comparisons. The grey areas indicate closely related sequences between GIs (> 70% nucleotide identity); the identity percentage between pairs of GIs is given. Homologous ORFs of unknown function and unrelated ORFs are represented by black or white arrowed boxes, respectively. The identity percentage indicated on right goes until and includes the orfA conjugation gene. The angled arrows and the lollipops indicate the promoters and rho-independent transcription terminators experimentally demonstrated (black) or predicted from in silico analysis (white). Sequences used for this analysis are from the putative ICE ICESpn8140 of S. pneumoniae [GenBank:FR671412 and from the partially or completely sequenced genomes of S. parasanguinis ATCC15912 [GeneBank:NZ_ADVN00000000] and F0405 [GenBank:NZ_AEKM00000000], S. infantis ATCC 700779 [GeneBank:NZ_AEVD00000000] and S. australis ATCC700641 [GeneBank:NZ_AEQR00000000].
Carraro et al. BMC Microbiology 2011 11:238 doi:10.1186/1471-2180-11-238