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.
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.
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2.2 人食糜酶与琥珀酰-Ala-Ala-Pro-Phe-氯甲基酮复合物的晶体结构:其二肽基羧肽酶特异性的结构解释。
DOI:
10.1006/jmbi.1998.2462
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发表时间:
1999
期刊:
影响因子:
--
通讯作者:
Strobl,S
中科院分区:
文献类型:
--
作者:
Pereira,PJ;Wang,ZM;Rubin,H;Huber,R;Bode,W;Schechter,NM;Strobl,S
Human chymase (HC) is a chymotrypsin-like serine proteinase expressed by mast cells. The 2.2 Å 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 β-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 ϵ-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.
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DOI:
10.1515/bchm3.1995.376.11.681
发表时间:
1995
期刊:
Biological chemistry Hoppe-Seyler
影响因子:
--
作者:
Wang,ZM;Rubin,H;Schechter,NM
通讯作者:
Schechter,NM
影响因子:
2.9
作者:
M. Mcgrath;T. Mirzadegan;B. Schmidt
通讯作者:
B. Schmidt
影响因子:
5.6
作者:
Wolfram Bode;P. Schwager
通讯作者:
P. Schwager
影响因子:
27.4
作者:
BROMLEY, M;FISHER, WD;WOOLLEY, DE
通讯作者:
WOOLLEY, DE
影响因子:
4.8
作者:
R. Blevins;A. Tulinsky
通讯作者:
A. Tulinsky