1p03

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[[Image:1p03.gif|left|200px]]
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{{STRUCTURE_1p03| PDB=1p03 | SCENE= }}
{{STRUCTURE_1p03| PDB=1p03 | SCENE= }}
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'''STRUCTURE ANALYSIS OF SPECIFICITY. ALPHA-LYTIC PROTEASE COMPLEXES WITH ANALOGUES OF REACTION INTERMEDIATES'''
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===STRUCTURE ANALYSIS OF SPECIFICITY. ALPHA-LYTIC PROTEASE COMPLEXES WITH ANALOGUES OF REACTION INTERMEDIATES===
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==Overview==
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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., &amp; 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)
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(as it appears on PubMed at http://www.pubmed.gov), where 2611204 is the PubMed ID number.
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{{ABSTRACT_PUBMED_2611204}}
==About this Structure==
==About this Structure==
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[[Category: Agard, D A.]]
[[Category: Agard, D A.]]
[[Category: Bone, R.]]
[[Category: Bone, R.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 00:36:15 2008''

Revision as of 21:36, 27 July 2008

Image:1p03.png

Template:STRUCTURE 1p03

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

Template:ABSTRACT PUBMED 2611204

About this Structure

1P03 is a Single protein structure. Full crystallographic information is available from OCA.

Reference

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

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