7KLB

X-ray Counterpart to Neutron Structure of Reduced Human MnSOD

7KLB の概要

• エントリーDOI: 10.2210/pdb7klb/pdb
• 関連するPDBエントリー: 7KKS 7KKU 7KKW
• 分子名称: Superoxide dismutase [Mn], mitochondrial, MANGANESE (II) ION, POTASSIUM ION, ... (5 entities in total)
• 機能のキーワード: antioxidant, oxidoreductase, sod, superoxide
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 45163.53

構造登録者

Azadmanesh, J.,Lutz, W.E.,Coates, L.,Weiss, K.L.,Borgstahl, G.E.O. (登録日: 2020-10-29, 公開日: 2021-04-21, 最終更新日: 2023-11-15)

主引用文献

Azadmanesh, J.,Lutz, W.E.,Coates, L.,Weiss, K.L.,Borgstahl, G.E.O.
Direct detection of coupled proton and electron transfers in human manganese superoxide dismutase.
Nat Commun, 12:2079-2079, 2021

PubMed Abstract: Human manganese superoxide dismutase is a critical oxidoreductase found in the mitochondrial matrix. Concerted proton and electron transfers are used by the enzyme to rid the mitochondria of O. The mechanisms of concerted transfer enzymes are typically unknown due to the difficulties in detecting the protonation states of specific residues and solvent molecules at particular redox states. Here, neutron diffraction of two redox-controlled manganese superoxide dismutase crystals reveal the all-atom structures of Mn and Mn enzyme forms. The structures deliver direct data on protonation changes between oxidation states of the metal. Observations include glutamine deprotonation, the involvement of tyrosine and histidine with altered pKs, and four unusual strong-short hydrogen bonds, including a low barrier hydrogen bond. We report a concerted proton and electron transfer mechanism for human manganese superoxide dismutase from the direct visualization of active site protons in Mn and Mn redox states.

PubMed: 33824320
DOI: 10.1038/s41467-021-22290-1

実験手法

X-RAY DIFFRACTION (2.16 Å)