3BOC

Carbonic anhydrase from marine diatom Thalassiosira weissflogii- zinc bound domain 2 (CDCA1-R2)

3BOC の概要

• エントリーDOI: 10.2210/pdb3boc/pdb
• 関連するPDBエントリー: 3BOB
• 分子名称: Cadmium-specific carbonic anhydrase, ZINC ION (3 entities in total)
• 機能のキーワード: carbonic anhydrase, marine diatom, zinc-bound, lyase
• 由来する生物種: Thalassiosira weissflogii
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 22497.86

構造登録者

Xu, Y.,Feng, L.,Jeffrey, P.D.,Shi, Y.,Morel, F.M.M. (登録日: 2007-12-17, 公開日: 2008-01-22, 最終更新日: 2024-02-21)

主引用文献

Xu, Y.,Feng, L.,Jeffrey, P.D.,Shi, Y.,Morel, F.M.
Structure and metal exchange in the cadmium carbonic anhydrase of marine diatoms.
Nature, 452:56-61, 2008

PubMed Abstract: Carbonic anhydrase, a zinc enzyme found in organisms from all kingdoms, catalyses the reversible hydration of carbon dioxide and is used for inorganic carbon acquisition by phytoplankton. In the oceans, where zinc is nearly depleted, diatoms use cadmium as a catalytic metal atom in cadmium carbonic anhydrase (CDCA). Here we report the crystal structures of CDCA in four distinct forms: cadmium-bound, zinc-bound, metal-free and acetate-bound. Despite lack of sequence homology, CDCA is a structural mimic of a functional beta-carbonic anhydrase dimer, with striking similarity in the spatial organization of the active site residues. CDCA readily exchanges cadmium and zinc at its active site--an apparently unique adaptation to oceanic life that is explained by a stable opening of the metal coordinating site in the absence of metal. Given the central role of diatoms in exporting carbon to the deep sea, their use of cadmium in an enzyme critical for carbon acquisition establishes a remarkable link between the global cycles of cadmium and carbon.

PubMed: 18322527
DOI: 10.1038/nature06636

実験手法

X-RAY DIFFRACTION (1.8 Å)