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3er5

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[[Image:3er5.jpg|left|200px]]
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[[Image:3er5.png|left|200px]]
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{{STRUCTURE_3er5| PDB=3er5 | SCENE= }}
{{STRUCTURE_3er5| PDB=3er5 | SCENE= }}
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'''THE ACTIVE SITE OF ASPARTIC PROTEINASES'''
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===THE ACTIVE SITE OF ASPARTIC PROTEINASES===
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==Overview==
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H-189, a synthetic human renin inhibitor, and pepstatin A, a naturally occurring inhibitor of aspartic proteinases, have been co-crystallized with the fungal aspartic proteinase endothiapepsin (EC 3.4.23.6). H-189 [Pro-His-Pro-Phe-His-Sta-(statyl)-Val-Ile-His-Lys] is an analogue of human angiotensinogen. Pepstatin A [Iva(isovaleryl)-Val-Val-Sta-Ala-Sta] is a blocked pentapeptide which inhibits many aspartic proteinases. The structures of the complexes have been determined by X-ray diffraction and refined to crystallographic R-factors of 0.15 and 0.16 at resolutions of 0.18 nm (1.8 A) and 0.2 nm (2.0 A) respectively. H-189 is in an extended conformation, in which the statine residue is a dipeptide analogue of P1 and P'1 as indicated by the conformation and network of contacts and hydrogen bonds. Pepstatin A has an extended conformation to the P'2 alanine residue, but the leucyl side chain of the terminal statine residue binds back into the S'1 subsite, and an inverse gamma-turn occurs between P'1 and P'3. The hydroxy moiety of the statine at P1 in both complexes displaces the solvent molecule that hydrogen-bonds with the catalytic aspartate residues (32 and 215) in the native enzyme. Solvent molecules originally present in the native structure at the active site are displaced on inhibitor binding (12 when pepstatin A binds; 16 when H-189 binds).
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(as it appears on PubMed at http://www.pubmed.gov), where 8424781 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8424781}}
==About this Structure==
==About this Structure==
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[[Category: Szelke, M.]]
[[Category: Szelke, M.]]
[[Category: Veerapandian, B.]]
[[Category: Veerapandian, B.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:00:59 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 04:35:39 2008''

Revision as of 01:35, 28 July 2008

Image:3er5.png

Template:STRUCTURE 3er5

THE ACTIVE SITE OF ASPARTIC PROTEINASES

Template:ABSTRACT PUBMED 8424781

About this Structure

3ER5 is a Protein complex structure of sequences from Cryphonectria parasitica. Full crystallographic information is available from OCA.

Reference

X-ray-crystallographic studies of complexes of pepstatin A and a statine-containing human renin inhibitor with endothiapepsin., Bailey D, Cooper JB, Veerapandian B, Blundell TL, Atrash B, Jones DM, Szelke M, Biochem J. 1993 Jan 15;289 ( Pt 2):363-71. PMID:8424781

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