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3apr

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[[Image:3apr.jpg|left|200px]]
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{{STRUCTURE_3apr| PDB=3apr | SCENE= }}
{{STRUCTURE_3apr| PDB=3apr | SCENE= }}
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'''BINDING OF A REDUCED PEPTIDE INHIBITOR TO THE ASPARTIC PROTEINASE FROM RHIZOPUS CHINENSIS. IMPLICATIONS FOR A MECHANISM OF ACTION'''
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===BINDING OF A REDUCED PEPTIDE INHIBITOR TO THE ASPARTIC PROTEINASE FROM RHIZOPUS CHINENSIS. IMPLICATIONS FOR A MECHANISM OF ACTION===
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==Overview==
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A peptide inhibitor, having the sequence D-His-Pro-Phe-His-Phe psi [CH2-NH]Phe-Val-Tyr, with a reduced bond between the two adjacent phenylalanines, has been diffused into crystals of the aspartic proteinase from Rhizopus chinensis (rhizopuspepsin, EC 3.4.23.6). X-ray diffraction data to 1.8-A resolution have been collected on the complex, which has been subjected to restrained least-squares refinement to an R-factor (R equals the sum of the absolute value of the difference between the observed and calculated structure factor amplitudes divided by the sum of the observed structure factor amplitudes) of 14.7%. The inhibitor lies within the major groove of the enzyme and is clearly defined with the exception of the amino-terminal D-histidine and the carboxyl-terminal tyrosine. The reduced peptide bond is located in the active site with close contacts to the two catalytic aspartyl groups. The active-site water molecule that is held between the two carboxyl groups is displaced by the inhibitor, as are a number of other water molecules seen in the binding groove of the native enzyme. A mechanism of action for this class of enzymes is proposed from these results.
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(as it appears on PubMed at http://www.pubmed.gov), where 3313384 is the PubMed ID number.
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{{ABSTRACT_PUBMED_3313384}}
==About this Structure==
==About this Structure==
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[[Category: Davies, D R.]]
[[Category: Davies, D R.]]
[[Category: Suguna, K.]]
[[Category: Suguna, K.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 20:19:43 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 12:32:52 2008''

Revision as of 09:32, 28 July 2008

Image:3apr.png

Template:STRUCTURE 3apr

BINDING OF A REDUCED PEPTIDE INHIBITOR TO THE ASPARTIC PROTEINASE FROM RHIZOPUS CHINENSIS. IMPLICATIONS FOR A MECHANISM OF ACTION

Template:ABSTRACT PUBMED 3313384

About this Structure

3APR is a Single protein structure. Full crystallographic information is available from OCA.

Reference

Binding of a reduced peptide inhibitor to the aspartic proteinase from Rhizopus chinensis: implications for a mechanism of action., Suguna K, Padlan EA, Smith CW, Carlson WD, Davies DR, Proc Natl Acad Sci U S A. 1987 Oct;84(20):7009-13. PMID:3313384

Page seeded by OCA on Mon Jul 28 12:32:52 2008

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