Ferric enterochelin transport in Yersinia enterocolitica: molecular and evolutionary aspects.
Yersinia enterocolitica is well equipped for siderophore piracy, encompassing the utilization of siderophores such as ferrioxamine, ferrichrome, and ferrienterochelin. In this study, we report on the molecular and functional characterization of the Yersinia fep-fes gene cluster orthologous to the Escherichia coli ferrienterochelin transport genes (fepA, fepDGC, and fepB) and the esterase gene fes. In vitro transcription-translation analysis identified polypeptides of 30 and 35 kDa encoded by fepC and fes, respectively. A frameshift mutation within the fepA gene led to expression of a truncated polypeptide of 40 kDa. The fepD, fepG, and fes genes of Y. enterocolitica were shown to complement corresponding E. coli mutants. Insertional mutagenesis of fepD or fes genes abrogates enterochelin-supported growth of Y. enterocolitica on iron-chelated media. In contrast to E. coli, the fep-fes gene cluster in Y. enterocolitica consists solely of genes required for uptake and utilization of enterochelin (fep) and not of enterochelin synthesis genes such as entF. By Southern hybridization, fepDGC and fes sequences could be detected in Y. enterocolitica biotypes IB, IA, and II but not in biotype IV strains, Yersinia pestis, and Yersinia pseudotuberculosis strains. According to sequence alignment data and the coherent structure of the Yersinia fep-fes gene cluster, we suggest early genetic divergence of ferrienterochelin uptake determinants among species of the family Enterobacteriaceae.
Schubert
S
S
Max von Pettenkofer-Institut, 80336 Munich, Germany.
Fischer
D
D
Heesemann
J
J
D001483:Base Sequence; D001692:Biological Transport / Q000235:genetics; D002265:Carboxylic Ester Hydrolases / Q000235:genetics; D016384:Consensus Sequence; D004758:Enterobactin / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D019143:Evolution, Molecular; D005290:Ferric Compounds / Q000378:metabolism*; D016368:Frameshift Mutation; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D015698:Genomic Library; D008969:Molecular Sequence Data; D005810:Multigene Family; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D012703:Serotyping; D015008:Yersinia enterocolitica / Q000145:classification / Q000235:genetics*; D015010:Yersinia pestis / Q000235:genetics; D015011:Yersinia pseudotuberculosis / Q000235:genetics
D029968:Escherichia coli Proteins; D005290:Ferric Compounds; D004758:Enterobactin; C014554:ferrienterochelin; D002265:Carboxylic Ester Hydrolases; C075139:ferric enterobactin esterase, E coli