1p04 | pdb_00001p04

STRUCTURE ANALYSIS OF SPECIFICITY. ALPHA-LYTIC PROTEASE COMPLEXES WITH ANALOGUES OF REACTION INTERMEDIATES

spinqualitylabelsall models 1p04, resolution 2.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1p04 is a 2 chain structure with sequence from Atcc 29487. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SO4 NonStd Res: B2I, MSU Activity: Alpha-lytic endopeptidase, with EC number 3.4.21.12 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 To better understand the structural basis of enzyme specificity, the structures of complexes formed between alpha-lytic protease, an extracellular serine protease of Lysobacter enzymogenes, and five inhibitory peptide boronic acids (R2-boroX, where R2 is methoxysuccinyl-Ala-Ala-Pro- and boroX is the alpha-aminoboronic acid analogue of Ala, Val, Ile, Norleu, or Phe) have been studied at high resolution by X-ray crystallography. The enzyme has primary specificity for Ala in the P1 position of peptide substrates with catalytic efficiency decreasing with increasing side-chain volume. Enzyme affinity for inhibitors with boroVal, boroIle, and boroPhe residues is much higher than expected on the basis of the catalytic efficiencies of homologous substrates. Covalent tetrahedral adducts are formed between the active-site serine and the boronic acid moieties of R2-boroAla, R2-boroVal R2-boroIle, and R2-boroNorleu. Though R2-boroVal is a slowly bound inhibitor and R2-boroAla is rapidly bound [Kettner, C. A., Bone, R., Agard, D. A., & Bachovchin, W. W. (1988) Biochemistry 27, 7682-7688], there appear to be no structural differences that could account for slow binding. The removal from solution of 20% more hydrophobic surface on binding accounts for the improved affinity of alpha-lytic protease for R2-boroVal relative to R2-boroAla. The high affinity of the enzyme for R2-boroIle derives from the selective binding of the L-allo stereoisomer of the boroIle residue, which can avoid bad steric interactions in the binding pocket.(ABSTRACT TRUNCATED AT 250 WORDS) Structural analysis of specificity: alpha-lytic protease complexes with analogues of reaction intermediates.,Bone R, Frank D, Kettner CA, Agard DA Biochemistry. 1989 Sep 19;28(19):7600-9. PMID:2611204 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Alpha-lytic protease

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