1Q39

Crystal structure of the DNA repair enzyme endonuclease-VIII (Nei) from E. coli: The WT enzyme at 2.8 resolution.

1Q39 の概要

• エントリーDOI: 10.2210/pdb1q39/pdb
• 関連するPDBエントリー: 1Q3B 1Q3C
• 分子名称: Endonuclease VIII, ZINC ION, CALCIUM ION, ... (4 entities in total)
• 機能のキーワード: hydrolase
• 由来する生物種: Escherichia coli
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 30000.64

構造登録者

Golan, G.,Zharkov, D.O.,Feinberg, H.,Fernandes, A.S.,Zaika, E.I.,Kycia, J.H.,Grollman, A.P.,Shoham, G. (登録日: 2003-07-29, 公開日: 2004-08-03, 最終更新日: 2023-08-16)

主引用文献

Golan, G.,Zharkov, D.O.,Feinberg, H.,Fernandes, A.S.,Zaika, E.I.,Kycia, J.H.,Grollman, A.P.,Shoham, G.
Structure of the uncomplexed DNA repair enzyme endonuclease VIII indicates significant interdomain flexibility.
Nucleic Acids Res., 33:5006-5016, 2005

PubMed Abstract: Escherichia coli endonuclease VIII (Nei) excises oxidized pyrimidines from DNA. It shares significant sequence homology and similar mechanism with Fpg, a bacterial 8-oxoguanine glycosylase. The structure of a covalent Nei-DNA complex has been recently determined, revealing critical amino acid residues which are important for DNA binding and catalysis. Several Fpg structures have also been reported; however, analysis of structural dynamics of Fpg/Nei family proteins has been hindered by the lack of structures of uncomplexed and DNA-bound enzymes from the same source. We report a 2.8 A resolution structure of free wild-type Nei and two structures of its inactive mutants, Nei-E2A (2.3 A) and Nei-R252A (2.05 A). All three structures are virtually identical, demonstrating that the mutations did not affect the overall conformation of the protein in its free state. The structures show a significant conformational change compared with the Nei structure in its complex with DNA, reflecting a approximately 50 degrees rotation of the two main domains of the enzyme. Such interdomain flexibility has not been reported previously for any DNA glycosylase and may present the first evidence for a global DNA-induced conformational change in this class of enzymes. Several local but functionally relevant structural changes are also evident in other parts of the enzyme.

PubMed: 16145054
DOI: 10.1093/nar/gki796

実験手法

X-RAY DIFFRACTION (2.8 Å)