Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA.
Gerstner Sloan Kettering Graduate School of Biomedical Sciences, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA.
Genes Dev. 2023 Feb 1;37(3-4):74-79. doi: 10.1101/gad.350054.122. Epub 2023 Jan 26.
Pol2 is the leading-strand DNA polymerase in budding yeast. Here we describe an antagonism between its conserved POPS (Pol2 family-specific catalytic core peripheral subdomain) and exonuclease domain and the importance of this antagonism in genome replication. We show that multiple defects caused by POPS mutations, including impaired growth and DNA synthesis, genome instability, and reliance on other genome maintenance factors, were rescued by exonuclease inactivation. Single-molecule data revealed that the rescue stemmed from allowing sister replication forks to progress at equal rates. Our data suggest that balanced activity of Pol2's POPS and exonuclease domains is vital for genome replication and stability.
Pol2 是芽殖酵母中领头链 DNA 聚合酶。在此,我们描述了其保守的 POPS(Pol2 家族特异性催化核心外围亚结构域)与外切酶结构域之间的拮抗作用,以及该拮抗作用在基因组复制中的重要性。我们发现,POPS 突变导致的多种缺陷,包括生长和 DNA 合成受损、基因组不稳定性以及对其他基因组维护因子的依赖,在外切酶失活后得到了挽救。单分子数据显示,挽救源于允许姐妹复制叉以相等的速度前进。我们的数据表明,Pol2 的 POPS 和外切酶结构域的平衡活性对于基因组复制和稳定性至关重要。