6k26 | pdb_00006k26
Crystal structure of Vibrio cholerae methionine aminopeptidase
Structural highlights
FunctionQ9KPV1_VIBCH Removes the N-terminal methionine from nascent proteins. The N-terminal methionine is often cleaved when the second residue in the primary sequence is small and uncharged (Met-Ala-, Cys, Gly, Pro, Ser, Thr, or Val). Requires deformylation of the N(alpha)-formylated initiator methionine before it can be hydrolyzed.[ARBA:ARBA00002521][HAMAP-Rule:MF_01974] Publication Abstract from PubMedMethionine aminopeptidases (MetAPs) have been recognized as drug targets and have been extensively studied for discovery of selective inhibitors. MetAPs are essential enzymes in all living cells. While most prokaryotes contain a single gene, some prokaryotes and all eukaryotes including human have redundancy. Due to the similarity in the active sites of the MetAP enzyme between the pathogens and human limited the success of discovering selective inhibitors. We recently have discovered that MetAPs with small inserts within the catalytic domain to have different susceptibilities against some inhibitors compared to those that do not have. Using this clue we used bioinformatic tools to identify new variants of MetAPs with inserts in pathogenic species. Two new isoforms were identified in Vibrio species with two and three inserts in addition to an isoform without any insert. Multiple sequence alignment suggested that inserts are conserved in several of the Vibrio species. Two of the three inserts are common between two and three insert isoforms. One of the inserts is identified to have "NNKNN" motif that is similar to well-characterized quorum sensing peptide, "NNWNN". Another insert is predicted to have a posttranslational modification site. Three Vibrio proteins were cloned, expressed, purified, enzyme kinetics established and inhibitor screening has been performed. Several of the pyridinylpyrimidine derivatives selectively inhibited MetAPs with inserts compared to those that do not have, including the human enzyme. Crystal structure and molecular modeling studies provide the molecular basis for selective inhibition. Methionine aminopeptidases with short sequence inserts within the catalytic domain are differentially inhibited: Structural and biochemical studies of three proteins from Vibrio spp.,Pillalamarri V, Reddy CG, Bala SC, Jangam A, Kutty VV, Addlagatta A Eur J Med Chem. 2021 Jan 1;209:112883. doi: 10.1016/j.ejmech.2020.112883. Epub , 2020 Sep 28. PMID:33035924[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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