3JR5

MutM lesion recognition control complex with N174C crosslinking site

3JR5 の概要

• エントリーDOI: 10.2210/pdb3jr5/pdb
• 関連するPDBエントリー: 3JR4
• 分子名称: DNA glycosylase, DNA (5'-D(*AP*GP*GP*TP*AP*GP*AP*CP*TP*CP*GP*GP*AP*CP*GP*C)-3'), DNA (5'-D(*TP*GP*CP*GP*TP*CP*CP*(OGX)P*AP*GP*TP*CP*TP*AP*CP*C)-3'), ... (6 entities in total)
• 機能のキーワード: dna glycosylase, dna repair, damage search, base extrusion, disulfide crosslinking, dna damage, dna-binding, glycosidase, hydrolase, lyase, metal-binding, multifunctional enzyme, zinc-finger, lyase-dna complex, lyase/dna
• 由来する生物種: Geobacillus stearothermophilus (Geobacillus stearothermophilus)
• タンパク質・核酸の鎖数: 3
• 化学式量合計: 40627.37

構造登録者

Qi, Y.,Spong, M.C.,Verdine, G.L. (登録日: 2009-09-08, 公開日: 2009-11-03, 最終更新日: 2024-11-20)

主引用文献

Qi, Y.,Spong, M.C.,Nam, K.,Karplus, M.,Verdine, G.L.
Entrapment and structure of an extrahelical guanine attempting to enter the active site of a bacterial DNA glycosylase, MutM.
J.Biol.Chem., 285:1468-1478, 2010

PubMed Abstract: MutM, a bacterial DNA glycosylase, protects genome integrity by catalyzing glycosidic bond cleavage of 8-oxoguanine (oxoG) lesions, thereby initiating base excision DNA repair. The process of searching for and locating oxoG lesions is especially challenging, because of the close structural resemblance of oxoG to its million-fold more abundant progenitor, G. Extrusion of the target nucleobase from the DNA double helix to an extrahelical position is an essential step in lesion recognition and catalysis by MutM. Although the interactions between the extruded oxoG and the active site of MutM have been well characterized, little is known in structural detail regarding the interrogation of extruded normal DNA bases by MutM. Here we report the capture and structural elucidation of a complex in which MutM is attempting to present an undamaged G to its active site. The structure of this MutM-extrahelical G complex provides insights into the mechanism MutM employs to discriminate against extrahelical normal DNA bases and into the base extrusion process in general.

PubMed: 19889642
DOI: 10.1074/jbc.M109.069799

実験手法

X-RAY DIFFRACTION (1.704 Å)