1VDC

STRUCTURE OF NADPH DEPENDENT THIOREDOXIN REDUCTASE

1VDC の概要

• エントリーDOI: 10.2210/pdb1vdc/pdb
• 分子名称: NADPH DEPENDENT THIOREDOXIN REDUCTASE, SULFATE ION, FLAVIN-ADENINE DINUCLEOTIDE, ... (4 entities in total)
• 機能のキーワード: hypothetical protein, redox-active center, oxidoreductase, disulfide oxidoreductase, thioredoxin reductase, flavin adenine dinuleotide
• 由来する生物種: Arabidopsis thaliana (thale cress)
• 細胞内の位置: Cytoplasm: Q39243
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 36301.67

構造登録者

Dai, S.,Eklund, H. (登録日: 1996-09-22, 公開日: 1997-03-12, 最終更新日: 2024-10-16)

主引用文献

Dai, S.,Saarinen, M.,Ramaswamy, S.,Meyer, Y.,Jacquot, J.P.,Eklund, H.
Crystal structure of Arabidopsis thaliana NADPH dependent thioredoxin reductase at 2.5 A resolution.
J.Mol.Biol., 264:1044-1057, 1996

PubMed Abstract: Thioredoxin exists in all organisms and is responsible for the hydrogen transfer to important enzymes for ribonucleotide reduction and the reduction of methionine sulphoxide and sulphate. Thioredoxins have also been shown to regulate enzyme activity in plants and are also involved in the regulation of transcription factors and several other regulatory activities. Thioredoxin is reduced by the flavoenzyme thioredoxin reductase using NADPH. We have now determined the first structure of a eukaryotic thioredoxin reductase, from the plant Arabidopsis thaliana, at 2.5 A resolution. The dimeric A. thaliana thioredoxin reductase is structurally similar to that of the Escherichia coli enzyme, and most differences occur in the loops. Because the plant and E. coli enzymes have the same architecture, with the same dimeric structure and the same position of the redox active disulphide bond, a similar mechanism that involves very large domain rotations is likely for the two enzymes. The subunit is divided into two domains, one that binds FAD and one that binds NADPH. The relative positions of the domains in A. thaliana thioredoxin reductase differ from those of the E. coli reductase. When the FAD domains are superimposed, the NADPH domain of A. thaliana thioredoxin reductase must be rotated by 8 degrees to superimpose on the corresponding domain of the E. coli enzyme. The domain rotation we now observe is much smaller than necessary for the thioredoxin reduction cycle.

PubMed: 9000629
DOI: 10.1006/jmbi.1996.0695

実験手法

X-RAY DIFFRACTION (2.5 Å)