8B9C

S. cerevisiae pol alpha - replisome complex

これはPDB形式変換不可エントリーです。

8B9C の概要

• エントリーDOI: 10.2210/pdb8b9c/pdb
• EMDBエントリー: 15924
• 分子名称: DNA replication licensing factor MCM2, DNA replication complex GINS protein PSF2, DNA replication complex GINS protein PSF3, ... (23 entities in total)
• 機能のキーワード: replication, helicase, polymerase, pol alpha, priming, replisome
• 由来する生物種: Saccharomyces cerevisiae (baker's yeast); 詳細
• タンパク質・核酸の鎖数: 20
• 化学式量合計: 1518163.43

構造登録者

Jones, M.L.,Yeeles, J.T.P. (登録日: 2022-10-05, 公開日: 2023-08-09, 最終更新日: 2023-08-30)

主引用文献

Jones, M.L.,Aria, V.,Baris, Y.,Yeeles, J.T.P.
How Pol alpha-primase is targeted to replisomes to prime eukaryotic DNA replication.
Mol.Cell, 83:2911-, 2023

PubMed Abstract: During eukaryotic DNA replication, Pol α-primase generates primers at replication origins to start leading-strand synthesis and every few hundred nucleotides during discontinuous lagging-strand replication. How Pol α-primase is targeted to replication forks to prime DNA synthesis is not fully understood. Here, by determining cryoelectron microscopy (cryo-EM) structures of budding yeast and human replisomes containing Pol α-primase, we reveal a conserved mechanism for the coordination of priming by the replisome. Pol α-primase binds directly to the leading edge of the CMG (CDC45-MCM-GINS) replicative helicase via a complex interaction network. The non-catalytic PRIM2/Pri2 subunit forms two interfaces with CMG that are critical for in vitro DNA replication and yeast cell growth. These interactions position the primase catalytic subunit PRIM1/Pri1 directly above the exit channel for lagging-strand template single-stranded DNA (ssDNA), revealing why priming occurs efficiently only on the lagging-strand template and elucidating a mechanism for Pol α-primase to overcome competition from RPA to initiate primer synthesis.

PubMed: 37506699
DOI: 10.1016/j.molcel.2023.06.035

実験手法

ELECTRON MICROSCOPY (4.6 Å)