1G6B

CRYSTAL STRUCTURE OF P47S MUTANT OF FERREDOXIN I

1G6B の概要

• エントリーDOI: 10.2210/pdb1g6b/pdb
• 関連するPDBエントリー: 7FD1
• 分子名称: 7FE FERREDOXIN I, IRON/SULFUR CLUSTER, FE3-S4 CLUSTER, ... (4 entities in total)
• 機能のキーワード: iron-sulfur clusters, ferredoxin, electron transport
• 由来する生物種: Azotobacter vinelandii
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 12696.93

構造登録者

Stout, C.D.,Burgess, B.K.,Bonagura, C.A.,Jung, Y.S. (登録日: 2000-11-03, 公開日: 2000-11-22, 最終更新日: 2023-08-09)

主引用文献

Chen, K.,Jung, Y.S.,Bonagura, C.A.,Tilley, G.J.,Prasad, G.S.,Sridhar, V.,Armstrong, F.A.,Stout, C.D.,Burgess, B.K.
Azotobacter vinelandii ferredoxin I: a sequence and structure comparison approach to alteration of [4Fe-4S]2+/+ reduction potential.
J.Biol.Chem., 277:5603-5610, 2002

PubMed Abstract: The reduction potential (E(0)') of the [4Fe-4S](2+/+) cluster of Azotobacter vinelandii ferredoxin I (AvFdI) and related ferredoxins is approximately 200 mV more negative than the corresponding clusters of Peptostreptococcus asaccharolyticus ferredoxin and related ferredoxins. Previous studies have shown that these differences in E(0)' do not result from the presence or absence of negatively charged surface residues or in differences in the types of hydrophobic residues found close to the [4Fe-4S](2+/+) clusters. Recently, a third, quite distinct class of ferredoxins (represented by the structurally characterized Chromatium vinosum ferredoxin) was shown to have a [4Fe-4S](2+/+) cluster with a very negative E(0)' similar to that of AvFdI. The observation that the sequences and structures surrounding the very negative E(0)' clusters in quite dissimilar proteins were almost identical inspired the construction of three additional mutations in the region of the [4Fe-4S](2+/+) cluster of AvFdI. The three mutations, V19E, P47S, and L44S, that incorporated residues found in the higher E(0)' P. asaccharolyticus ferredoxin all led to increases in E(0)' for a total of 130 mV with a 94-mV increase in the case of L44S. The results are interpreted in terms of x-ray structures of the FdI variants and show that the major determinant for the large increase in L44S is the introduction of an OH-S bond between the introduced Ser side chain and the Sgamma atom of Cys ligand 42 and an accompanying movement of water.

PubMed: 11704670
DOI: 10.1074/jbc.M108916200

実験手法

X-RAY DIFFRACTION (1.9 Å)