Figure 3

The MTA nucleosidase / MTR kinase pathway in B. subtilis and K. aeruginosa. When the methionine salvage pathway exists, while the organism does not code for a MTA phosphorylase, the combination of MTA nucleosidase and MTR kinase produce MTR-1-P from MTA (Figure 1). B. subtilis (BACSU) and K. pneumoniae (KLEPN) possess this pathway, while E. coli (ESCCO) has only the nucleosidase. Conservative replacements are shown in blue following Dayhoff's rule [54]. The short protein that may be a truncated MtnK in X. fastidiosa is shown for comparison (identities with the B. subtilis sequence in orange, and similarities in violet).