Skip to main content
. 2009 Sep 3;4(9):e6859. doi: 10.1371/journal.pone.0006859

Figure 4. Neighbor-joining tree of Helicobacter Xer (tyrosine recombinase) protein sequences with bootstrap values.

Figure 4

Most H. pylori strains contain two divergent xer genes of 356 codons on average, one chromosomal (xerH) and one in TnPZ (xerT) (protein identity about 26%) [see multiple alignments, Fig. S10). TnPZ xerT genes can be subdivided into three allele types that correspond to TnPZ type (1, 1b and 2), with protein identities between them of about 53%. Note that jhp0941 is a mosaic of 90 codons of tfs3 orfB sequence and 241 codons of type 2 xerT sequence. Only the 241 codon xerT component of jhp0941 was used in this analysis. The two or more types of TnPZ xerT genes found in a few strains reflect the presence of one remnant plus a full length TnPZ (PeCan18B) or of multiple TnPZ remnants (26695, J99) in them. Orfs marked with an asterisk are pseudogenes that have been inactivated by point mutation (frameshift, internal stop), insertion or deletion.