Abstract
In recent studies carried through by our group involving proteins of the ABC transport systems from Xanthomonas axonopodis pv. citri (X. axonopodis), we identified by amino acid sequence homology, a set of proteins that supposedly would form the "cys regulon" for sulphur assimilation, well characterized in Escherichia coli. Despite of the economic importance of X. axonopodis, a phytopatho…