title: A nonessential signal peptidase II (Lsp) of Myxococcus xanthus might be involved in biosynthesis of the polyketide antibiotic TA.
abstract: Myxococcus xanthus is a gram-negative soil bacterium that produces the polyketide antibiotic TA. In this study, we describe the analysis of an M. xanthus gene which encodes a homologue of the prolipoprotein signal peptidase II (SPase II; lsp). Overexpression of the M. xanthus SPase II in Escherichia coli confers high levels of globomycin resistance, confirming its function as an SPase II. The M. xanthus gene encoding the lsp homologue is nonessential for growth, as determined by specific gene disruption. It has been mapped to the antibiotic TA gene cluster, and the disrupted mutants do not produce the antibiotic, indicating a probable involvement in TA production. These results suggest the existence of more than one SPase II protein in M. xanthus, where one is a system-specific SPase II (for TA biosynthesis).
authors.affiliation: Department of Molecular Microbiology and Biotechnology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Israel.
authors.forename: Y
authors.initials: Y
authors.lastname: Paitan
authors.forename: E
authors.initials: E
authors.lastname: Orr
authors.forename: E Z
authors.initials: EZ
authors.lastname: Ron
authors.forename: E
authors.initials: E
authors.lastname: Rosenberg
mesh_terms: D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000096:biosynthesis* / Q000494:pharmacology; D016282:Aspartic Acid Endopeptidases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D001426:Bacterial Proteins; D002462:Cell Membrane / Q000201:enzymology / Q000648:ultrastructure; D003001:Cloning, Molecular; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics; D017353:Gene Deletion; D005798:Genes, Bacterial; D005816:Genetic Complementation Test; D018942:Macrolides; D008958:Models, Molecular; D008969:Molecular Sequence Data; D005810:Multigene Family; D016941:Myxococcus xanthus / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D010455:Peptides; D016133:Polymerase Chain Reaction; D017433:Protein Structure, Secondary; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D018942:Macrolides; D010455:Peptides; C035536:Myxococcus xanthus antibiotic TA; C017339:globomycin; D016282:Aspartic Acid Endopeptidases; C095652:signal peptidase II