3TEN

Holo form of carbon disulfide hydrolase

3TEN の概要

• エントリーDOI: 10.2210/pdb3ten/pdb
• 関連するPDBエントリー: 3TEO
• 分子名称: CS2 hydrolase, ZINC ION (3 entities in total)
• 機能のキーワード: none, beta carbonic anhydrase fold, carbon disulfide hydrolysis, hydrolase
• 由来する生物種: Acidianus sp. A1-3
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 189403.46

構造登録者

Smeulders, M.J.,Barends, T.R.M.B.,Pol, A.,Scherer, A.,Zandvoort, M.H.,Udvarhelyi, A.,Khadem, A.,Menzel, A.,Hermans, J.,Shoeman, R.L.,Wessels, H.J.C.T.,van den Heuvel, L.P.,Russ, L.,Schlichting, I.,Jetten, M.S.M.,Op den Camp, H.J.M. (登録日: 2011-08-15, 公開日: 2011-10-19, 最終更新日: 2024-02-28)

主引用文献

Smeulders, M.J.,Barends, T.R.,Pol, A.,Scherer, A.,Zandvoort, M.H.,Udvarhelyi, A.,Khadem, A.F.,Menzel, A.,Hermans, J.,Shoeman, R.L.,Wessels, H.J.,van den Heuvel, L.P.,Russ, L.,Schlichting, I.,Jetten, M.S.,Op den Camp, H.J.
Evolution of a new enzyme for carbon disulphide conversion by an acidothermophilic archaeon.
Nature, 478:412-416, 2011

PubMed Abstract: Extremophilic organisms require specialized enzymes for their exotic metabolisms. Acid-loving thermophilic Archaea that live in the mudpots of volcanic solfataras obtain their energy from reduced sulphur compounds such as hydrogen sulphide (H(2)S) and carbon disulphide (CS(2)). The oxidation of these compounds into sulphuric acid creates the extremely acidic environment that characterizes solfataras. The hyperthermophilic Acidianus strain A1-3, which was isolated from the fumarolic, ancient sauna building at the Solfatara volcano (Naples, Italy), was shown to rapidly convert CS(2) into H(2)S and carbon dioxide (CO(2)), but nothing has been known about the modes of action and the evolution of the enzyme(s) involved. Here we describe the structure, the proposed mechanism and evolution of a CS(2) hydrolase from Acidianus A1-3. The enzyme monomer displays a typical β-carbonic anhydrase fold and active site, yet CO(2) is not one of its substrates. Owing to large carboxy- and amino-terminal arms, an unusual hexadecameric catenane oligomer has evolved. This structure results in the blocking of the entrance to the active site that is found in canonical β-carbonic anhydrases and the formation of a single 15-Å-long, highly hydrophobic tunnel that functions as a specificity filter. The tunnel determines the enzyme's substrate specificity for CS(2), which is hydrophobic. The transposon sequences that surround the gene encoding this CS(2) hydrolase point to horizontal gene transfer as a mechanism for its acquisition during evolution. Our results show how the ancient β-carbonic anhydrase, which is central to global carbon metabolism, was transformed by divergent evolution into a crucial enzyme in CS(2) metabolism.

PubMed: 22012399
DOI: 10.1038/nature10464

実験手法

X-RAY DIFFRACTION (2.6 Å)