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-Structure paper
タイトル | Structures and operating principles of the replisome. |
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ジャーナル・号・ページ | Science, Vol. 363, Issue 6429, Year 2019 |
掲載日 | 2019年2月22日 |
![]() | Yang Gao / Yanxiang Cui / Tara Fox / Shiqiang Lin / Huaibin Wang / Natalia de Val / Z Hong Zhou / Wei Yang / ![]() |
PubMed 要旨 | Visualization in atomic detail of the replisome that performs concerted leading- and lagging-DNA strand synthesis at a replication fork has not been reported. Using bacteriophage T7 as a model ...Visualization in atomic detail of the replisome that performs concerted leading- and lagging-DNA strand synthesis at a replication fork has not been reported. Using bacteriophage T7 as a model system, we determined cryo-electron microscopy structures up to 3.2-angstroms resolution of helicase translocating along DNA and of helicase-polymerase-primase complexes engaging in synthesis of both DNA strands. Each domain of the spiral-shaped hexameric helicase translocates sequentially hand-over-hand along a single-stranded DNA coil, akin to the way AAA+ ATPases (adenosine triphosphatases) unfold peptides. Two lagging-strand polymerases are attached to the primase, ready for Okazaki fragment synthesis in tandem. A β hairpin from the leading-strand polymerase separates two parental DNA strands into a T-shaped fork, thus enabling the closely coupled helicase to advance perpendicular to the downstream DNA duplex. These structures reveal the molecular organization and operating principles of a replisome. |
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手法 | EM (単粒子) |
解像度 | 3.2 - 13.8 Å |
構造データ | EMDB-0357, PDB-6n7i: EMDB-0359, PDB-6n7n: EMDB-0362, PDB-6n7s: EMDB-0363, PDB-6n7t: EMDB-0364, PDB-6n7v: EMDB-0365, PDB-6n7w: EMDB-0379, PDB-6n9u: EMDB-0380, PDB-6n9v: EMDB-0381, PDB-6n9w: EMDB-0382, PDB-6n9x: ![]() EMDB-0386: ![]() EMDB-0387: ![]() EMDB-0388: ![]() EMDB-0389: ![]() EMDB-0390: ![]() EMDB-0391: ![]() EMDB-0392: ![]() EMDB-0393: ![]() EMDB-0394: ![]() EMDB-0395: |
化合物 | ![]() ChemComp-TTP: ![]() ChemComp-MG: ![]() ChemComp-HOH: ![]() ChemComp-ZN: |
由来 |
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![]() | HYDROLASE / TRANSFERASE/DNA / helicase / ATPase / hexamer / DNA replication / TRANSFERASE-DNA complex / DNA polymerase / replisome / primase |