8RB8

Cryo-EM structure of the NADH:ferredoxin oxidoreductase RNF from Azotobacter vinelandii, purified with 2-ME/TCEP, NADH added

8RB8 の概要

• エントリーDOI: 10.2210/pdb8rb8/pdb
• EMDBエントリー: 19028
• 分子名称: Ion-translocating oxidoreductase complex subunit A, FLAVIN MONONUCLEOTIDE, IRON/SULFUR CLUSTER, ... (12 entities in total)
• 機能のキーワード: nadh:ferredoxin oxidoreductase, membrane protein
• 由来する生物種: Azotobacter vinelandii DJ; 詳細
• タンパク質・核酸の鎖数: 7
• 化学式量合計: 200189.58

構造登録者

Zhang, L.,Einsle, O. (登録日: 2023-12-03, 公開日: 2024-06-26, 最終更新日: 2025-07-09)

主引用文献

Zhang, L.,Einsle, O.
Architecture of the RNF1 complex that drives biological nitrogen fixation.
Nat.Chem.Biol., 20:1078-1085, 2024

PubMed Abstract: Biological nitrogen fixation requires substantial metabolic energy in form of ATP as well as low-potential electrons that must derive from central metabolism. During aerobic growth, the free-living soil diazotroph Azotobacter vinelandii transfers electrons from the key metabolite NADH to the low-potential ferredoxin FdxA that serves as a direct electron donor to the dinitrogenase reductases. This process is mediated by the RNF complex that exploits the proton motive force over the cytoplasmic membrane to lower the midpoint potential of the transferred electron. Here we report the cryogenic electron microscopy structure of the nitrogenase-associated RNF complex of A. vinelandii, a seven-subunit membrane protein assembly that contains four flavin cofactors and six iron-sulfur centers. Its function requires the strict coupling of electron and proton transfer but also involves major conformational changes within the assembly that can be traced with a combination of electron microscopy and modeling.

PubMed: 38890433
DOI: 10.1038/s41589-024-01641-1

実験手法

ELECTRON MICROSCOPY (3.41 Å)