3U7F

Crystal structure of mPNKP catalytic fragment (D170A) bound to single-stranded DNA (TCCTCp)

3U7F の概要

• エントリーDOI: 10.2210/pdb3u7f/pdb
• 関連するPDBエントリー: 1YJ5 3U7E 3U7g 3U7h
• 分子名称: Bifunctional polynucleotide phosphatase/kinase, DNA, MAGNESIUM ION, ... (6 entities in total)
• 機能のキーワード: protein-dna complex, had family, pnkp, dna repair, phosphatase, hydrolase, transferase-dna complex, transferase/dna
• 由来する生物種: Mus musculus (mouse); 詳細
• 細胞内の位置: Nucleus : Q9JLV6
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 44392.30

構造登録者

Coquelle, N.,Havali, Z.,Bernstein, N.,Green, R.,Glover, J.N.M. (登録日: 2011-10-13, 公開日: 2011-12-14, 最終更新日: 2024-11-06)

主引用文献

Coquelle, N.,Havali-Shahriari, Z.,Bernstein, N.,Green, R.,Glover, J.N.
Structural basis for the phosphatase activity of polynucleotide kinase/phosphatase on single- and double-stranded DNA substrates.
Proc.Natl.Acad.Sci.USA, 108:21022-21027, 2011

PubMed Abstract: Polynucleotide kinase/phosphatase (PNKP) is a critical mammalian DNA repair enzyme that generates 5'-phosphate and 3'-hydroxyl groups at damaged DNA termini that are required for subsequent processing by DNA ligases and polymerases. The PNKP phosphatase domain recognizes 3'-phosphate termini within DNA nicks, gaps, or at double- or single-strand breaks. Here we present a mechanistic rationale for the recognition of damaged DNA termini by the PNKP phosphatase domain. The crystal structures of PNKP bound to single-stranded DNA substrates reveals a narrow active site cleft that accommodates a single-stranded substrate in a sequence-independent manner. Biochemical studies suggest that the terminal base pairs of double-stranded substrates near the 3'-phosphate are destabilized by PNKP to allow substrate access to the active site. A positively charged surface distinct from the active site specifically facilitates interactions with double-stranded substrates, providing a complex DNA binding surface that enables the recognition of diverse substrates.

PubMed: 22171004
DOI: 10.1073/pnas.1112036108

実験手法

X-RAY DIFFRACTION (1.8 Å)