1FP6

THE NITROGENASE FE PROTEIN FROM AZOTOBACTER VINELANDII COMPLEXED WITH MGADP

1FP6 の概要

• エントリーDOI: 10.2210/pdb1fp6/pdb
• 分子名称: NITROGENASE IRON PROTEIN, MAGNESIUM ION, IRON/SULFUR CLUSTER, ... (5 entities in total)
• 機能のキーワード: nitrogenase, nitrogen fixation, nuclotide, mgadp, fe protein, av2, oxidoreductase
• 由来する生物種: Azotobacter vinelandii
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 128177.48

構造登録者

Jang, S.B.,Seefeldt, L.C.,Peters, J.W. (登録日: 2000-08-30, 公開日: 2001-01-17, 最終更新日: 2024-02-07)

主引用文献

Jang, S.B.,Seefeldt, L.C.,Peters, J.W.
Insights into nucleotide signal transduction in nitrogenase: structure of an iron protein with MgADP bound.
Biochemistry, 39:14745-14752, 2000

PubMed Abstract: Coupling the energy of nucleoside triphosphate binding and hydrolysis to conformational changes is a common mechanism for a number of proteins with disparate cellular functions, including those involved in DNA replication, protein synthesis, and cell differentiation. Unique to this class of proteins is the dimeric Fe protein component of nitrogenase in which the binding and hydrolysis of MgATP controls intermolecular electron transfer and reduction of nitrogen to ammonia. In the work presented here, the MgADP-bound (or "off") conformational state of the nitrogenase Fe protein has been captured and a 2.15 A resolution X-ray crystal structure is presented. The structure described herein reveals likely mechanisms for long-range communication from the nucleotide-binding sites for controlling the affinity of association with the MoFe protein component. Two pathways, termed switches I and II, appear to be integral to this nucleotide signal transduction mechanism. In addition, the structure provides the basis for the changes in the biophysical properties of the [4Fe-4S] cluster observed when Fe protein binds nucleotides. The structure of the MgADP-bound Fe protein provides important insights into the respective contributions of nucleotide interaction and complex formation in defining the conformational states that are the keys to nitrogenase catalysis.

PubMed: 11101289
DOI: 10.1021/bi001705g

実験手法

X-RAY DIFFRACTION (2.15 Å)