6FW2

Crystal Structure of human mARC1

6FW2 の概要

• エントリーDOI: 10.2210/pdb6fw2/pdb
• 分子名称: Mitochondrial amidoxime-reducing component 1,Endolysin,Mitochondrial amidoxime-reducing component 1, PHOSPHONIC ACIDMONO-(2-AMINO-5,6-DIMERCAPTO-4-OXO-3,7,8A,9,10,10A-HEXAHYDRO-4H-8-OXA-1,3,9,10-TETRAAZA-ANTHRACEN-7-YLMETHYL)ESTER, oxidanyl(oxidanylidene)molybdenum, ... (7 entities in total)
• 機能のキーワード: marc, mosc, molybdenum cofactor, moco, n-reduction, oxidoreductase
• 由来する生物種: Homo sapiens (Human); 詳細
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 53386.78

構造登録者

Kubitza, C.,Scheidig, A. (登録日: 2018-03-05, 公開日: 2018-10-31, 最終更新日: 2024-05-08)

主引用文献

Kubitza, C.,Bittner, F.,Ginsel, C.,Havemeyer, A.,Clement, B.,Scheidig, A.J.
Crystal structure of human mARC1 reveals its exceptional position among eukaryotic molybdenum enzymes.
Proc. Natl. Acad. Sci. U.S.A., 115:11958-11963, 2018

PubMed Abstract: Biotransformation enzymes ensure a viable homeostasis by regulating reversible cycles of oxidative and reductive reactions. The metabolism of nitrogen-containing compounds is of high pharmaceutical and toxicological relevance because N-oxygenated metabolites derived from reactions mediated by cytochrome P450 enzymes or flavin-dependent monooxygenases are in some cases highly toxic or mutagenic. The molybdenum-dependent mitochondrial amidoxime-reducing component (mARC) was found to be an extremely efficient counterpart, which is able to reduce the full range of N-oxygenated compounds and thereby mediates detoxification reactions. However, the 3D structure of this enzyme was unknown. Here we present the high-resolution crystal structure of human mARC. We give detailed insight into the coordination of its molybdenum cofactor (Moco), the catalytic mechanism, and its ability to reduce a wide range of N-oxygenated compounds. The identification of two key residues will allow future discrimination between mARC paralogs and ensure correct annotation. Since our structural findings contradict in silico predictions that are currently made by online databases, we propose domain definitions for members of the superfamily of Moco sulfurase C-terminal (MOSC) domain-containing proteins. Furthermore, we present evidence for an evolutionary role of mARC for the emergence of the xanthine oxidase protein superfamily. We anticipate the hereby presented crystal structure to be a starting point for future descriptions of MOSC proteins, which are currently poorly structurally characterized.

PubMed: 30397129
DOI: 10.1073/pnas.1808576115

実験手法

X-RAY DIFFRACTION (1.78 Å)