5ZOD

Crystal Structure of hFen1 in apo form

5ZOD の概要

• エントリーDOI: 10.2210/pdb5zod/pdb
• 関連するPDBエントリー: 5UM9
• 分子名称: Flap endonuclease 1, MAGNESIUM ION, POTASSIUM ION, ... (4 entities in total)
• 機能のキーワード: flap endonuclease: gap endonuclease: methylation: posttranslational modification, dna binding protein, hydrolase
• 由来する生物種: Homo sapiens (Human)
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 37872.29

構造登録者

Han, W.,Hua, Y.,Zhao, Y. (登録日: 2018-04-13, 公開日: 2019-01-30, 最終更新日: 2023-11-22)

主引用文献

Xu, H.,Shi, R.,Han, W.,Cheng, J.,Xu, X.,Cheng, K.,Wang, L.,Tian, B.,Zheng, L.,Shen, B.,Hua, Y.,Zhao, Y.
Structural basis of 5' flap recognition and protein-protein interactions of human flap endonuclease 1.
Nucleic Acids Res., 46:11315-11325, 2018

PubMed Abstract: Human flap endonuclease 1 (hFEN1) is a structure-specific nuclease essential for DNA replication and repair processes. hFEN1 has 5' flap removal activity, as well as gap endonuclease activity that is critical for restarting stalled replication forks. Here, we report the crystal structures of wild-type and mutant hFEN1 proteins in complex with DNA substrates, followed by mutagenesis studies that provide mechanistic insight into the protein-protein interactions of hFEN1. We found that in an α-helix forming the helical gateway of hFEN1 recognizes the 5' flap prior to its threading into the active site for cleavage. We also found that the β-pin region is rigidified into a short helix in R192F hFEN1-DNA structures, suppressing its gap endonuclease activity and cycle-dependent kinase interactions. Our findings suggest that a single mutation at the primary methylation site can alter the function of hFEN1 and provide insight into the role of the β-pin region in hFEN1 protein interactions that are essential for DNA replication and repair.

PubMed: 30295841
DOI: 10.1093/nar/gky911

実験手法

X-RAY DIFFRACTION (1.9 Å)