title: Pulvomycin, an inhibitor of protein biosynthesis preventing ternary complex formation between elongation factor Tu, GTP, and aminoacyl-tRNA.
abstract: Pulvomycin and the synonymous antibiotics labilomycin and 1063-Z are shown to inhibit prokaryotic protein synthesis by acting on elongation factor Tu (EF-Tu): in the presence of the antibiotic, the affinity of EF-Tu for guanine nucleotides is altered, the EF-Tu.GDP/GTP exchange is catalyzed, and the formation of the EF-Tu.GTP complex is stimulated. Hydrolysis of GTP by EF-Tu, induced by aminoacyl-tRNA, ribosomes, and mRNA or by kirromycin, is inhibited by pulvomycin. As shown by Millipore filtration, chromatographic analysis, and hydrolysis protection experiments, pulvomycin prevents interaction between aminoacyl-tRNA and EF-Tu.GTP to yield the ternary complex aminoacyl-tRNA.EF-Tu.GTP. Thus, enzymatic binding of aminoacyl-tRNA to ribosomes is blocked.
mesh_terms: D000617:Aminoglycosides; D000935:Antifungal Agents / Q000494:pharmacology*; D004926:Escherichia coli / Q000378:metabolism; D006027:Glycosides / Q000494:pharmacology; D006160:Guanosine Triphosphate / Q000378:metabolism*; D007700:Kinetics; D010441:Peptide Chain Elongation, Translational / Q000187:drug effects*; D010445:Peptide Elongation Factors / Q000378:metabolism*; D011485:Protein Binding; D012346:RNA, Transfer, Amino Acyl / Q000378:metabolism*; D012270:Ribosomes / Q000187:drug effects / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D000617:Aminoglycosides; D000935:Antifungal Agents; D006027:Glycosides; D010445:Peptide Elongation Factors; D012346:RNA, Transfer, Amino Acyl; C012521:pulvomycin; D006160:Guanosine Triphosphate