1pjp: Difference between revisions
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[[Image:1pjp.gif|left|200px]] | [[Image:1pjp.gif|left|200px]] | ||
'''THE 2.2 A CRYSTAL STRUCTURE OF HUMAN CHYMASE IN COMPLEX WITH SUCCINYL-ALA-ALA-PRO-PHE-CHLOROMETHYLKETONE''' | {{Structure | ||
|PDB= 1pjp |SIZE=350|CAPTION= <scene name='initialview01'>1pjp</scene>, resolution 2.2Å | |||
|SITE= | |||
|LIGAND= <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene> and <scene name='pdbligand=ZN:ZINC ION'>ZN</scene> | |||
|ACTIVITY= [http://en.wikipedia.org/wiki/Chymase Chymase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.39 3.4.21.39] | |||
|GENE= | |||
}} | |||
'''THE 2.2 A CRYSTAL STRUCTURE OF HUMAN CHYMASE IN COMPLEX WITH SUCCINYL-ALA-ALA-PRO-PHE-CHLOROMETHYLKETONE''' | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
1PJP is a [ | 1PJP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PJP OCA]. | ||
==Reference== | ==Reference== | ||
The 2.2 A crystal structure of human chymase in complex with succinyl-Ala-Ala-Pro-Phe-chloromethylketone: structural explanation for its dipeptidyl carboxypeptidase specificity., Pereira PJ, Wang ZM, Rubin H, Huber R, Bode W, Schechter NM, Strobl S, J Mol Biol. 1999 Feb 12;286(1):163-73. PMID:[http:// | The 2.2 A crystal structure of human chymase in complex with succinyl-Ala-Ala-Pro-Phe-chloromethylketone: structural explanation for its dipeptidyl carboxypeptidase specificity., Pereira PJ, Wang ZM, Rubin H, Huber R, Bode W, Schechter NM, Strobl S, J Mol Biol. 1999 Feb 12;286(1):163-73. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9931257 9931257] | ||
[[Category: Chymase]] | [[Category: Chymase]] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
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[[Category: serine proteinase]] | [[Category: serine proteinase]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:25:18 2008'' | ||
Revision as of 11:25, 20 March 2008
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| 1pjp, resolution 2.2Å | |||||||||||||
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| Ligands: | NAG and ZN | ||||||||||||
| Activity: | Chymase, with EC number 3.4.21.39 | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
THE 2.2 A CRYSTAL STRUCTURE OF HUMAN CHYMASE IN COMPLEX WITH SUCCINYL-ALA-ALA-PRO-PHE-CHLOROMETHYLKETONE
Overview
Human chymase (HC) is a chymotrypsin-like serine proteinase expressed by mast cells. The 2.2 A crystal structure of HC complexed to the peptidyl inhibitor, succinyl-Ala-Ala-Pro-Phe-chloromethylketone (CMK), was solved and refined to a crystallographic R-factor of 18.4 %. The HC structure exhibits the typical folding pattern of a chymotrypsin-like serine proteinase, and shows particularly similarity to rat chymase 2 (rat mast cell proteinase II) and human cathepsin G. The peptidyl-CMK inhibitor is covalently bound to the active-site residues Ser195 and His57; the peptidyl moiety juxtaposes the S1 entrance frame segment 214-217 by forming a short antiparallel beta-sheet. HC is a highly efficient angiotensin-converting enzyme. Modeling of the chymase-angiotensin I interaction guided by the geometry of the bound chloromethylketone inhibitor indicates that the extended substrate binding site contains features that may generate the dipeptidyl carboxypeptidase-like activity needed for efficient cleavage and activation of the hormone. The C-terminal carboxylate group of angiotensin I docked into the active-site cleft, with the last two residues extending beyond the active site, is perfectly localized to make a favorable hydrogen bond and salt bridge with the amide nitrogen of the Lys40-Phe41 peptide bond and with the epsilon-ammonium group of the Lys40 side-chain. This amide positioning is unique to the chymase-related proteinases, and only chymases from primates possess a Lys residue at position 40. Thus, the structure conveniently explains the preferred conversion of angiotensin I to angiotensin II by human chymase.
About this Structure
1PJP is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
The 2.2 A crystal structure of human chymase in complex with succinyl-Ala-Ala-Pro-Phe-chloromethylketone: structural explanation for its dipeptidyl carboxypeptidase specificity., Pereira PJ, Wang ZM, Rubin H, Huber R, Bode W, Schechter NM, Strobl S, J Mol Biol. 1999 Feb 12;286(1):163-73. PMID:9931257
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