title: Roles of VioG and VioQ in the incorporation and modification of the Capreomycidine residue in the peptide antibiotic viomycin.
abstract: The nonproteinogenic amino acid capreomycidine is the signature residue found in the tuberactinomycin family of antitubercular peptide antibiotics and an important element of the pharmacophore. Recombinant VioG, a single-module peptide synthetase from the viomycin gene cluster cloned from Streptomyces vinaceus (ATCC11861), specifically activates capreomycidine for incorporation into viomycin (tuberactinomycin B). Insertional disruption of the putative hydroxylase gene vioQ resulted in a mutant that accumulated tuberactinomycin O, suggesting that hydroxylation at C-5 of the capreomycidine residue is a post-assembly event. The inactivated chromosomal copy of vioQ could be complemented with a wild-type copy of the gene to restore viomycin production.
authors.affiliation: Program in Molecular and Cellular Biology and Department of Pharmaceutical Sciences, Oregon State University, Corvallis, Oregon 97331-3507, USA.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Fei
authors.forename: Xihou
authors.initials: X
authors.lastname: Yin
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: T Mark
authors.initials: TM
authors.lastname: Zabriskie
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D001483:Base Sequence; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D005798:Genes, Bacterial / Q000502:physiology*; D015394:Molecular Structure; D010453:Peptide Synthases / Q000235:genetics / Q000378:metabolism*; D013302:Streptomyces / Q000737:chemistry* / Q000235:genetics; D014756:Viomycin / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D010453:Peptide Synthases; C104385:non-ribosomal peptide synthase; D014756:Viomycin