2gtx

Structural Basis of Catalysis by Mononuclear Methionine Aminopeptidase

spinqualitylabelsall models 2gtx, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2gtx is a 2 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MN, NA, NLP Related: 2gu4, 2gu5, 2gu6, 2gu7 Gene: map ("Bacillus coli" Migula 1895) Activity: Methionyl aminopeptidase, with EC number 3.4.11.18 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [AMPM_ECOLI] Removes the N-terminal methionine from nascent proteins. 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 PubMed Methionine aminopeptidase (MetAP) removes the amino-terminal methionine residue from newly synthesized proteins, and it is a target for the development of antibacterial and anticancer agents. Available x-ray structures of MetAP, as well as other metalloaminopeptidases, show an active site containing two adjacent divalent metal ions bridged by a water molecule or hydroxide ion. The predominance of dimetalated structures leads naturally to proposed mechanisms of catalysis involving both metal ions. However, kinetic studies indicate that in many cases, only a single metal ion is required for full activity. By limiting the amount of metal ion present during crystal growth, we have now obtained a crystal structure for a complex of Escherichia coli MetAP with norleucine phosphonate, a transition-state analog, and only a single Mn(II) ion bound at the active site in the position designated M1, and three related structures of the same complex that show the transition from the mono-Mn(II) form to the di-Mn(II) form. An unliganded structure was also solved. In view of the full kinetic competence of the monometalated MetAP, the much weaker binding constant for occupancy of the M2 site compared with the M1 site, and the newly determined structures, we propose a revised mechanism of peptide bond hydrolysis by E. coli MetAP. We also suggest that the crystallization of dimetalated forms of metallohydrolases may, in some cases, be a misleading experimental artifact, and caution must be taken when structures are generated to aid in elucidation of reaction mechanisms or to support structure-aided drug design efforts. Structural basis of catalysis by monometalated methionine aminopeptidase.,Ye QZ, Xie SX, Ma ZQ, Huang M, Hanzlik RP Proc Natl Acad Sci U S A. 2006 Jun 20;103(25):9470-5. Epub 2006 Jun 12. PMID:16769889 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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