1W35

FERREDOXIN-NADP+ REDUCTASE (MUTATION: Y 303 W)

1W35 の概要

• エントリーDOI: 10.2210/pdb1w35/pdb
• 関連するPDBエントリー: 1B2R 1BJK 1BQE 1E62 1E63 1E64 1EWY 1GJR 1GO2 1GR1 1H42 1H85 1OGI 1OGJ 1QGY 1QGZ 1QH0 1QUE 1QUF 1W34
• 分子名称: FERREDOXIN-NADP+ REDUCTASE, FLAVIN-ADENINE DINUCLEOTIDE, SULFATE ION, ... (4 entities in total)
• 機能のキーワード: oxidoreductase, flavoprotein, nadp, fad, fnr, nadp reductase
• 由来する生物種: ANABAENA PCC7119
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 35077.52

構造登録者

Hermoso, J.A.,Perez-Dorado, I.,Medina, M.,Julvez, M.M.,Sanz-Aparicio, J.,Gomez-Moreno, C. (登録日: 2004-07-13, 公開日: 2005-07-26, 最終更新日: 2023-12-13)

主引用文献

Tejero, J.,Perez-Dorado, I.,Maya, C.,Julvez, M.M.,Sanz-Aparicio, J.,Gomez-Moreno, C.,Hermoso, J.A.,Medina, M.
C-Terminal Tyrosine of Ferredoxin-Nadp(+) Reductase in Hydride Transfer Processes with Nad(P)(+)/H.
Biochemistry, 44:13477-, 2005

PubMed Abstract: Ferredoxin-NADP+ reductase (FNR) catalyzes the reduction of NADP+ to NADPH in an overall reversible reaction, showing some differences in the mechanisms between cyanobacterial and higher plant FNRs. During hydride transfer it is proposed that the FNR C-terminal Tyr is displaced by the nicotinamide. Thus, this C-terminal Tyr might be involved not only in modulating the flavin redox properties, as already shown, but also in nicotinamide binding and hydride transfer. FNR variants from the cyanobacterium Anabaena in which the C-terminal Tyr has been replaced by Trp, Phe, or Ser have been produced. All FNR variants show enhanced NADP+ and NAD+ binding, especially Tyr303Ser, which correlates with a noticeable improvement of NADH-dependent reactions. Nevertheless, the Tyr303Ser variant shows a decrease in the steady-state kcat value with NADPH. Fast kinetic analysis of the hydride transfer shows that the low efficiency observed for this mutant FNR under steady-state conditions is not due to a lack of catalytic ability but rather to the strong enzyme-coenzyme interaction. Three-dimensional structures for Tyr303Ser and Tyr303Trp variants and its complexes with NADP+ show significant differences between plant and cyanobacterial FNRs. Our results suggest that modulation of coenzyme affinity is highly influenced by the strength of the C-terminus-FAD interaction and that subtle changes between plant and cyanobacterial structures are able to modify the energy of that interaction. Additionally, it is shown that the C-terminal Tyr of FNR lowers the affinity for NADP+/H to levels compatible with steady-state turnover during the catalytic cycle, but it is not involved in the hydride transfer itself.

PubMed: 16216071
DOI: 10.1021/BI051278C

実験手法

X-RAY DIFFRACTION (1.9 Å)