Structural highlights
Function[CPT_STRVL] Inactivates chloramphenicol by catalyzing the transfer of the gamma-phosphate of ATP to the antibiotic's C-3' hydroxyl group. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedStreptomyces venezuelae synthesizes chloramphenicol (Cm), an inhibitor of ribosomal peptidyl transferase activity, thereby inhibiting bacterial growth. The producer escapes autoinhibition by its own secondary metabolite through phosphorylation of Cm by chloramphenicol phosphotransferase (CPT). In addition to active site binding, CPT binds its product 3-phosphoryl-Cm, in an alternate product binding site. To address the mechanisms of Cm tolerance of the producer, the crystal structures of CPT were determined in complex with either the nonchlorinated Cm (2-N-Ac-Cm) at 3.1 A resolution or the antibiotic's immediate precursor, the p-amino analog p-NH(2)-Cm, at 2.9 A resolution. Surprisingly, p-NH(2)-Cm binds CPT in a novel fashion. Additionally, neither 2-N-Ac-Cm nor p-NH(2)-Cm binds to the secondary product binding site. Structural basis for chloramphenicol tolerance in Streptomyces venezuelae by chloramphenicol phosphotransferase activity.,Izard T Protein Sci. 2001 Aug;10(8):1508-13. PMID:11468347[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences | ||||||||||||||||||||
This page was last modified 14:52, 25 December 2014.