Molecular architecture and oligomerization of Candida glabrata Cdc13 underpin its telomeric DNA-binding and unfolding activity.

Molecular architecture and oligomerization of Candida glabrata Cdc13 underpin its telomeric DNA-binding and unfolding activity.
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念珠菌CDC13的分子结构和寡聚的基础是其端粒DNA结合和展开活性。

DOI:
10.1093/nar/gkac1261
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发表时间:
2023-01-25
影响因子:
14.9
通讯作者:
Llorca, Oscar
Llorca, Oscar
中科院分区:
生物学2区
文献类型:
--
作者:
Coloma, Javier;Gonzalez-Rodriguez, Nayim;Balaguer, Francisco A.;Gmurczyk, Karolina;Aicart-Ramos, Clara;Nuero, oscar M.;Luque-Ortega, Juan Roman;Calugaru, Kimberly;Lue, Neal F.;Moreno-Herrero, Fernando;Llorca, Oscar

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CST 复合体是端粒复制和稳定性的关键参与者,在酵母中由 Cdc13、Stn1 和 Ten1 组成。虽然 Stn1 和 Ten1 在物种间非常保守,但 Cdc13 在序列或结构域组织上与哺乳动物对应物 CTC1 并不相似,并且 Cdc13 而不是 CTC1 显示独立于 CST 其余部分的功能。尽管人类 CTC1 和 CST 的结构已确定,但 Cdc13 的分子组织仍知之甚少。在这里,我们剖析了光滑念珠菌 Cdc13 的分子结构,并展示了它如何调节与端粒序列的结合。 Cdc13 通过 OB 折叠 2 (OB2) 结构域之间的相互作用形成二聚体。二聚化刺激 OB3 与端粒序列的结合,导致 ssDNA 二级结构的展开。一旦与 DNA 结合,Cdc13 就会通过涉及所有结构域的机制阻止 ssDNA 的重折叠。 OB1 也会寡聚化,在体外诱导 Cdc13 的高阶复合物。 OB1 截短会破坏这些复合物,影响 ssDNA 展开并缩短光滑 C. 端粒长度。总之,我们的结果揭示了光滑 C. glabrata Cdc13 的分子组织以及它如何调节 DNA 的结合和结构,并表明酵母物种进化出了具有一些共同原理的独特 Cdc13 结构。
The CST complex is a key player in telomere replication and stability, which in yeast comprises Cdc13, Stn1 and Ten1. While Stn1 and Ten1 are very well conserved across species, Cdc13 does not resemble its mammalian counterpart CTC1 either in sequence or domain organization, and Cdc13 but not CTC1 displays functions independently of the rest of CST. Whereas the structures of human CTC1 and CST have been determined, the molecular organization of Cdc13 remains poorly understood. Here, we dissect the molecular architecture of Candida glabrata Cdc13 and show how it regulates binding to telomeric sequences. Cdc13 forms dimers through the interaction between OB-fold 2 (OB2) domains. Dimerization stimulates binding of OB3 to telomeric sequences, resulting in the unfolding of ssDNA secondary structure. Once bound to DNA, Cdc13 prevents the refolding of ssDNA by mechanisms involving all domains. OB1 also oligomerizes, inducing higher-order complexes of Cdc13 in vitro. OB1 truncation disrupts these complexes, affects ssDNA unfolding and reduces telomere length in C. glabrata. Together, our results reveal the molecular organization of C. glabrata Cdc13 and how this regulates the binding and the structure of DNA, and suggest that yeast species evolved distinct architectures of Cdc13 that share some common principles.
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