title: An unusual beta-ketoacyl:acyl carrier protein synthase and acyltransferase motifs in TaK, a putative protein required for biosynthesis of the antibiotic TA in Myxococcus xanthus.
abstract: The antibiotic TA of Myxococcus xanthus is produced by a type-I polyketide synthase mechanism. Previous studies have indicated that TA genes are clustered within a 36-kb region. The chemical structure of TA indicates the need for several post-modification steps, which are introduced to form the final bioactive molecule. These include three C-methylations, an O-methylation and a specific hydroxylation. In this study, we describe the genetic analysis of taK, encoding a specific polyketide beta-ketoacyl:acyl carrier protein synthase, which contains an unusual beta-ketoacyl synthase and acyltransferase motifs and is likely to be involved in antibiotic TA post-modification. Functional analysis of this beta-ketoacyl:acyl carrier protein synthase by specific gene disruption suggests that it is essential for the production of an active TA molecule.
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: D015099:3-Oxoacyl-(Acyl-Carrier-Protein) Synthase / Q000235:genetics / Q000378:metabolism*; D000217:Acyltransferases / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism; D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D001426:Bacterial Proteins; D005798:Genes, Bacterial; D018942:Macrolides; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000737:chemistry* / Q000235:genetics* / Q000378:metabolism*; D016941:Myxococcus xanthus / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D048630:Polyketide Synthases; D017422:Sequence Analysis, DNA
chemical_list: D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D018942:Macrolides; D009097:Multienzyme Complexes; C439542:TaK protein, Myxococcus xanthus; C035536:Myxococcus xanthus antibiotic TA; D048630:Polyketide Synthases; D000217:Acyltransferases; C087193:polyketide beta-ketoacylsynthase; D015099:3-Oxoacyl-(Acyl-Carrier-Protein) Synthase