1CAN

CRYSTALLOGRAPHIC STUDIES OF THE BINDING OF PROTONATED AND UNPROTONATED INHIBITORS TO CARBONIC ANHYDRASE USING HYDROGEN SULPHIDE AND NITRATE ANIONS

1CAN の概要

• エントリーDOI: 10.2210/pdb1can/pdb
• 分子名称: CARBONIC ANHYDRASE II, MERCURY (II) ION, NITRATE ION, ... (4 entities in total)
• 機能のキーワード: lyase(oxo-acid)
• 由来する生物種: Homo sapiens (human)
• 細胞内の位置: Cytoplasm : P00918
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 29647.09

構造登録者

Mangani, S.,Hakansson, K. (登録日: 1992-07-02, 公開日: 1994-01-31, 最終更新日: 2024-10-16)

主引用文献

Mangani, S.,Hakansson, K.
Crystallographic studies of the binding of protonated and unprotonated inhibitors to carbonic anhydrase using hydrogen sulphide and nitrate anions.
Eur.J.Biochem., 210:867-871, 1992

PubMed Abstract: The structures of human carbonic-anhydrase-II complexes with the anionic inhibitors hydrogen sulphide (HS-) and nitrate (NO3-) have been determined by X-ray diffraction at 0.19-nm resolution from crystals soaked at pH 7.8 and 6.0, respectively. The modes of binding of these two anions differ markedly from each other. The strong inhibitor HS- replaces the native zinc-bound water/hydroxide (Wat263) leaving the tetrahedral metal geometry unaltered and acts as a hydrogen-bonding donor towards Thr199 gamma. The weak NO3- inhibitor does not displace Wat263 from the metal coordination but occupies a fifth binding site changing the zinc coordination polyhedron into a slightly distorted trigonal bipyramid. The interaction of NO3- with the metal is weak; the nearest of its oxygen atoms being at a distance of 0.28 nm from the zinc ion. The binding of nitrate to the enzyme is completed by a hydrogen bond to the metal coordinated Wat263 and a second one to a water molecule of the active-site cavity. The structures of the two complexes help to rationalize the binding of anionic inhibitors to carbonic anhydrase and the binding mode displayed by NO39 may be relevant to the catalytic mechanism.

PubMed: 1336460
DOI: 10.1111/j.1432-1033.1992.tb17490.x

実験手法

X-RAY DIFFRACTION (1.9 Å)