7KTG

DNA Polymerase Mu, 8-oxodGTP:Ct Product State Ternary Complex, 50 mM Mg2+ (960min)

7KTG の概要

• エントリーDOI: 10.2210/pdb7ktg/pdb
• 分子名称: DNA-directed DNA/RNA polymerase mu, 4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID, GLYCOLIC ACID, ... (12 entities in total)
• 機能のキーワード: time-lapse crystallography, oxidized nucleotide insertion, dna polymerase mu, double strand break repair, replication
• 由来する生物種: Homo sapiens (Human); 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 46447.14

構造登録者

Jamsen, J.A.,Wilson, S.H. (登録日: 2020-11-24, 公開日: 2021-12-15, 最終更新日: 2023-11-15)

主引用文献

Jamsen, J.A.,Sassa, A.,Shock, D.D.,Beard, W.A.,Wilson, S.H.
Watching a double strand break repair polymerase insert a pro-mutagenic oxidized nucleotide.
Nat Commun, 12:2059-2059, 2021

PubMed Abstract: Oxidized dGTP (8-oxo-7,8-dihydro-2´-deoxyguanosine triphosphate, 8-oxodGTP) insertion by DNA polymerases strongly promotes cancer and human disease. How DNA polymerases discriminate against oxidized and undamaged nucleotides, especially in error-prone double strand break (DSB) repair, is poorly understood. High-resolution time-lapse X-ray crystallography snapshots of DSB repair polymerase μ undergoing DNA synthesis reveal that a third active site metal promotes insertion of oxidized and undamaged dGTP in the canonical anti-conformation opposite template cytosine. The product metal bridged O8 with product oxygens, and was not observed in the syn-conformation opposite template adenine (A). Rotation of A into the syn-conformation enabled undamaged dGTP misinsertion. Exploiting metal and substrate dynamics in a rigid active site allows 8-oxodGTP to circumvent polymerase fidelity safeguards to promote pro-mutagenic double strand break repair.

PubMed: 33824325
DOI: 10.1038/s41467-021-21354-6

実験手法

X-RAY DIFFRACTION (1.445 Å)