1QF1

THERMOLYSIN (E.C.3.4.24.27) COMPLEXED WITH (2-SULPHANYLHEPTANOYL)-PHE-ALA. PARAMETERS FOR ZN-BIDENTATION OF MERCAPTOACYLDIPEPTIDES IN METALLOENDOPEPTIDASE

1QF1 の概要

• エントリーDOI: 10.2210/pdb1qf1/pdb
• 分子名称: PROTEIN (THERMOLYSIN), ZINC ION, CALCIUM ION, ... (6 entities in total)
• 機能のキーワード: neutral endopeptidase, zn metallopeptidase, hydrolase
• 由来する生物種: Bacillus thermoproteolyticus
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 35124.79

構造登録者

Gaucher, J.-F.,Selkti, M.,Tiraboschi, G.,Prange, T.,Roques, B.P.,Tomas, A.,Fournie-Zaluski, M.C. (登録日: 1999-04-06, 公開日: 1999-12-29, 最終更新日: 2023-08-16)

主引用文献

Gaucher, J.F.,Selkti, M.,Tiraboschi, G.,Prange, T.,Roques, B.P.,Tomas, A.,Fournie-Zaluski, M.C.
Crystal structures of alpha-mercaptoacyldipeptides in the thermolysin active site: structural parameters for a Zn monodentation or bidentation in metalloendopeptidases.
Biochemistry, 38:12569-12576, 1999

PubMed Abstract: Three alpha-mercaptoacyldipeptides differing essentially in the size of their C-terminal residues have been crystallized in the thermolysin active site. A new mode of binding was observed for 3 [HS-CH(CH(2)Ph)CO-Phe-Tyr] and 4 [HS-CH((CH(2))(4)CH(3))CO-Phe-Ala], in which the mercaptoacyl moieties act as bidentates with Zn-S and Zn-O distances of 2.3 and 2.4 A, respectively, the side chains fitting the S(1), S(1)', and S(2)' pockets. Moreover, a distance of 3.1 A between the sulfur atom and the OE1 of Glu(143) suggests that they are H-bonded and that one of these atoms is protonated. This H-bond network involving Glu(143), the mercaptoacyl group of the inhibitor, and the Zn ion could be considered a "modified" transition state mimic of the peptide bond hydrolysis. Due to the presence of the hindering (5-phenyl)proline, the inhibitor HS-CH(CH(2)Ph)CO-Gly-(5-Ph)Pro (2) interacts through the usual Zn monodentation via the thiol group and occupancy of S(1)' and S(2)' subsites by the aromatic moieties, the proline ring being outside the active site. The inhibitory potencies are consistent with these structural data, with higher affinities for 3 (4.2 x 10(-)(8) M) and 4 (4.8 x 10(-)(8) M) than for 2 (1.2 x 10(-)(6) M). The extension of the results, obtained with thermolysin being considered as the model of physiological zinc metallopeptidases, allows inhibitor-recognition modes for other peptidases, such as angiotensin converting enzyme and neutral endopeptidase, to be proposed and opens interesting possibilities for the design of new classes of inhibitors.

PubMed: 10504225
DOI: 10.1021/bi991043z

実験手法

X-RAY DIFFRACTION (2 Å)