1PPB

THE REFINED 1.9 ANGSTROMS CRYSTAL STRUCTURE OF HUMAN ALPHA-THROMBIN: INTERACTION WITH D-PHE-PRO-ARG CHLOROMETHYLKETONE AND SIGNIFICANCE OF THE TYR-PRO-PRO-TRP INSERTION SEGMENT

1PPB の概要

• エントリーDOI: 10.2210/pdb1ppb/pdb
• 関連するBIRD辞書のPRD_ID: PRD_000020
• 分子名称: ALPHA-THROMBIN (SMALL SUBUNIT), ALPHA-THROMBIN (LARGE SUBUNIT), D-phenylalanyl-N-[(2S,3S)-6-{[amino(iminio)methyl]amino}-1-chloro-2-hydroxyhexan-3-yl]-L-prolinamide, ... (4 entities in total)
• 機能のキーワード: serine proteinase, hydrolase-hydrolase inhibitor complex, hydrolase/hydrolase inhibitor
• 由来する生物種: Homo sapiens (human); 詳細
• 細胞内の位置: Secreted, extracellular space: P00734 P00734
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 34330.74

構造登録者

Bode, W. (登録日: 1991-10-24, 公開日: 1994-01-31, 最終更新日: 2024-11-20)

主引用文献

Bode, W.,Mayr, I.,Baumann, U.,Huber, R.,Stone, S.R.,Hofsteenge, J.
The refined 1.9 A crystal structure of human alpha-thrombin: interaction with D-Phe-Pro-Arg chloromethylketone and significance of the Tyr-Pro-Pro-Trp insertion segment.
EMBO J., 8:3467-3475, 1989

PubMed Abstract: A stoichiometric complex formed between human alpha-thrombin and D-Phe-Pro-Arg chloromethylketone was crystallized in an orthorhombic crystal form. Orientation and position of a starting model derived from homologous modelling were determined by Patterson search methods. The thrombin model was completed in a cyclic modelling-crystallographic refinement procedure to a final R-value of 0.171 for X-ray data to 1.92 A. The structure is in full agreement with published cDNA sequence data. The A-chain, ordered only in its central part, is positioned along the molecular surface opposite to the active site. The B-chain exhibits the characteristic polypeptide fold of trypsin-like proteinases. Several extended insertions form, however, large protuberances; most important for interaction with macromolecular substrates is the characteristic thrombin loop around Tyr60A-Pro60B-Pro60C-Trp60D (chymotrypsinogen numbering) and the enlarged loop around the unique Trp148. The former considerably restricts the active site cleft and seems likely to be responsible for poor binding of most natural proteinase inhibitors to thrombin. The exceptional specificity of D-Phe-Pro-Arg chloromethylketone can be explained by a hydrophobic cage formed by Ile174, Trp215, Leu99, His57, Tyr60A and Trp60D. The narrow active site cleft, with a more polar base and hydrophobic rims, extends towards the arginine-rich surface of loop Lys70-Glu80 that probably represents part of the anionic binding region for hirudin and fibrinogen.

PubMed: 2583108

実験手法

X-RAY DIFFRACTION (1.92 Å)