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-Structure paper
タイトル | Structures of the human CST-Polα-primase complex bound to telomere templates. |
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ジャーナル・号・ページ | Nature, Vol. 608, Issue 7924, Page 826-832, Year 2022 |
掲載日 | 2022年7月13日 |
著者 | Qixiang He / Xiuhua Lin / Bianca L Chavez / Sourav Agrawal / Benjamin L Lusk / Ci Ji Lim / |
PubMed 要旨 | The mammalian DNA polymerase-α-primase (Polα-primase) complex is essential for DNA metabolism, providing the de novo RNA-DNA primer for several DNA replication pathways such as lagging-strand ...The mammalian DNA polymerase-α-primase (Polα-primase) complex is essential for DNA metabolism, providing the de novo RNA-DNA primer for several DNA replication pathways such as lagging-strand synthesis and telomere C-strand fill-in. The physical mechanism underlying how Polα-primase, alone or in partnership with accessory proteins, performs its complicated multistep primer synthesis function is unknown. Here we show that CST, a single-stranded DNA-binding accessory protein complex for Polα-primase, physically organizes the enzyme for efficient primer synthesis. Cryogenic electron microscopy structures of the CST-Polα-primase preinitiation complex (PIC) bound to various types of telomere overhang reveal that template-bound CST partitions the DNA and RNA catalytic centres of Polα-primase into two separate domains and effectively arranges them in RNA-DNA synthesis order. The architecture of the PIC provides a single solution for the multiple structural requirements for the synthesis of RNA-DNA primers by Polα-primase. Several insights into the template-binding specificity of CST, template requirement for assembly of the CST-Polα-primase PIC and activation are also revealed in this study. |
リンク | Nature / PubMed:35830881 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 3.43 - 4.27 Å |
構造データ | EMDB-27097: Human CST-DNA polymerase alpha/primase preinitiation complex bound to 3xTEL template EMDB-27099: Human CST-DNA polymerase alpha/primase preinitiation complex bound to 3xTEL template - local refined domains and merged EMDB-27104, PDB-8d0b: EMDB-27107, PDB-8d0k: EMDB-27109: Human CST-DNA polymerase alpha/primase preinitiation complex bound to 6xTEL DNA template |
由来 |
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キーワード | REPLICATION/DNA / telomere / C-strand / complex / 4xTEL-foldback DNA template / REPLICATION-DNA complex / PRIM2C |