Site directed mutagenesis reveals functional importance of conserved amino acid residues within the N-terminal domain of Dpb2 in budding yeast

IF 2.3 3区 生物学 Q3 MICROBIOLOGY
Huma Shaz, Prakash Nandi, Sugopa Sengupta
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引用次数: 0

Abstract

In spite of being dispensable for catalysis, Dpb2, the second largest subunit of leading strand DNA polymerase (Polymerase ε) is essential for cell survival in budding yeast. Dpb2 physically connects polymerase epsilon with the replicative helicase (CMG,Cdc45-Mcm-GINS) by interacting with its Psf1 subunit. Dpb2-Psf1 interaction has been shown to be critical for incorporating polymerase ε into the replisome. Site-directed mutagenesis studies on conserved amino acid residues within the N-terminal domain of Dpb2 led to identification of key amino acid residues involved in interaction with Psf1 subunit of GINS. These amino acid residues are found to be well conserved among Dpb2 orthologues in higher eukaryotes thereby indicating the protein-protein interaction to be evolutionarily conserved. Replicating cells are known to mount a strong replicative stress response and DNA damage response upon exposure to diverse range of stressors. Here, we show that the absence of the N-terminal domain of Dpb2 increases the vulnerability of the budding yeast cells towards the cytotoxic effects of hydroxyurea (HU) and methyl methane sulphonate (MMS). Our results illustrate the importance of N-terminal domain of Dpb2 not only during replisome assembly but also in coordinating stress response in budding yeast. Considering high degree of sequence conservation across eukaryotes, Dpb2 subunit of leading-strand DNA polymerase appears to have important implications in maintenance of genome integrity.

Abstract Image

Dpb2 是前导链 DNA 聚合酶(聚合酶ε)的第二大亚基,尽管它对催化起着不可或缺的作用,但它对芽殖酵母细胞的存活却至关重要。Dpb2 通过与其 Psf1 亚基相互作用,将聚合酶ε与复制螺旋酶(CMG,Cdc45-Mcm-GINS)物理连接起来。Dpb2-Psf1 相互作用已被证明是将聚合酶ε纳入复制体的关键。通过对 Dpb2 N 端结构域中的保守氨基酸残基进行定点突变研究,发现了与 GINS 的 Psf1 亚基相互作用的关键氨基酸残基。这些氨基酸残基在高等真核生物中的 Dpb2 同源物之间有很好的保守性,从而表明蛋白质之间的相互作用在进化上是保守的。众所周知,复制细胞在暴露于各种应激源时会产生强烈的复制应激反应和 DNA 损伤反应。在这里,我们发现 Dpb2 N 端结构域的缺失增加了芽殖酵母细胞对羟基脲(HU)和甲基磺酸甲酯(MMS)细胞毒性作用的脆弱性。我们的研究结果表明,Dpb2 的 N 端结构域不仅在复制体组装过程中非常重要,而且在协调芽殖酵母的应激反应过程中也非常重要。考虑到真核生物之间高度的序列保守性,前导链 DNA 聚合酶的 Dpb2 亚基似乎在维护基因组完整性方面具有重要意义。
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来源期刊
Archives of Microbiology
Archives of Microbiology 生物-微生物学
CiteScore
4.90
自引率
3.60%
发文量
601
审稿时长
3 months
期刊介绍: Research papers must make a significant and original contribution to microbiology and be of interest to a broad readership. The results of any experimental approach that meets these objectives are welcome, particularly biochemical, molecular genetic, physiological, and/or physical investigations into microbial cells and their interactions with their environments, including their eukaryotic hosts. Mini-reviews in areas of special topical interest and papers on medical microbiology, ecology and systematics, including description of novel taxa, are also published. Theoretical papers and those that report on the analysis or ''mining'' of data are acceptable in principle if new information, interpretations, or hypotheses emerge.
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