Abstract
A genomic region containing the fatty acid biosynthetic (fab) genes was isolated from the sugarcane leaf-scald pathogen Xanthomonas albilineans. The order and predicted products of fabG (β-ketoacyl reductase), acpP (acyl carrier protein), fabF (ketoacyl synthase II) and downstream genes in X. albilineans are very similar to those in Escherichia coli, with one exception. Sequence analysis, confirmed by insertional knockout and specific substrate feeding experiments, shows that the position occupied by pabC (encoding aminodeoxychorismate lyase) in other bacteria is occupied instead by pabB (encoding aminodeoxychorismate synthase component I) in X. albilineans. Downstream of pabB, X. albilineans resumes the arrangement common to characterized Gram-negative bacteria, with three transcriptionally coupled genes, encoding an ORF340 protein of undefined function, thymidylate kinase and δ′ subunit of DNA polymerase III holoenzyme (HolB). Different species may obtain a common advantage from coordinated regulation of the same biosynthetic pathways using different genes in this region.
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