Structural highlights
Function[DAC_STRSR] Catalyzes distinct carboxypeptidation and transpeptidation reactions during the last stages of wall peptidoglycan synthesis. Mistaking a beta-lactam antibiotic molecule for a normal substrate (i.e. a D-alanyl-D-alanine-terminated peptide), it becomes immobilized in the form of a long-lived, serine-ester-linked acyl enzyme and thus behave as penicillin-binding protein (PBP). 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 PubMedN-Acyl-beta-sultams are time-dependent, irreversible active site-directed inhibitors of Streptomyces R61 DD-peptidase. The rate of inactivation is first order with respect to beta-sultam concentration, and the second-order rate constants show a dependence on pH similar to that for the hydrolysis of a substrate. Inactivation is due to the formation of a stable 1:1 enzyme-inhibitor complex as a result of the active site serine being sulfonylated by the beta-sultam as shown by ESI-MS analysis and by X-ray crystallography. A striking feature of the sulfonyl enzyme is that the inhibitor is not bound to the oxyanion hole but interacts extensively with the "roof" of the active site where the Arg 285 is located. Inactivation of bacterial DD-peptidase by beta-sultams.,Llinas A, Ahmed N, Cordaro M, Laws AP, Frere JM, Delmarcelle M, Silvaggi NR, Kelly JA, Page MI Biochemistry. 2005 May 31;44(21):7738-46. PMID:15909988[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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This page was last modified 06:37, 25 April 2018.