Structural and dynamic basis of DNA capture and translocation by mitochondrial Twinkle helicase.
Structural and dynamic basis of DNA capture and translocation by mitochondrial Twinkle helicase.
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DOI:
10.1093/nar/gkac1089
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发表时间:
2022-11-11
影响因子:
14.9
通讯作者:
Gao, Yang
中科院分区:
文献类型:
--
作者:
Li, Zhuo;Kaur, Parminder;Lo, Chen-Yu;Chopra, Neil;Smith, Jamie;Wang, Hong;Gao, Yang
Twinkle is a mitochondrial replicative helicase which can self-load onto and unwind mitochondrial DNA. Nearly 60 mutations on Twinkle have been linked to human mitochondrial diseases. Using cryo-electron microscopy (cryo-EM) and high-speed atomic force microscopy (HS-AFM), we obtained the atomic-resolution structure of a vertebrate Twinkle homolog with DNA and captured in real-time how Twinkle is self-loaded onto DNA. Our data highlight the important role of the non-catalytic N-terminal domain of Twinkle. The N-terminal domain directly contacts the C-terminal helicase domain, and the contact interface is a hotspot for disease-related mutations. Mutations at the interface destabilize Twinkle hexamer and reduce helicase activity. With HS-AFM, we observed that a highly dynamic Twinkle domain, which is likely to be the N-terminal domain, can protrude ∼5 nm to transiently capture nearby DNA and initialize Twinkle loading onto DNA. Moreover, structural analysis and subunit doping experiments suggest that Twinkle hydrolyzes ATP stochastically, which is distinct from related helicases from bacteriophages.
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影响因子:
64.8
作者:
Jumper J;Evans R;Pritzel A;Green T;Figurnov M;Ronneberger O;Tunyasuvunakool K;Bates R;Žídek A;Potapenko A;Bridgland A;Meyer C;Kohl SAA;Ballard AJ;Cowie A;Romera-Paredes B;Nikolov S;Jain R;Adler J;Back T;Petersen S;Reiman D;Clancy E;Zielinski M;Steinegger M;Pacholska M;Berghammer T;Bodenstein S;Silver D;Vinyals O;Senior AW;Kavukcuoglu K;Kohli P;Hassabis D
通讯作者:
Hassabis D
影响因子:
8.8
作者:
Eickhoff, Patrik;Kose, Hazal B.;Costa, Alessandro
通讯作者:
Costa, Alessandro
影响因子:
56.9
作者:
Gao, Yang;Cui, Yanxiang;Yang, Wei
通讯作者:
Yang, Wei
DOI:
10.1107/s2059798318006551
发表时间:
2018-06-01
期刊:
Acta crystallographica. Section D, Structural biology
影响因子:
--
作者:
Afonine PV;Poon BK;Read RJ;Sobolev OV;Terwilliger TC;Urzhumtsev A;Adams PD
通讯作者:
Adams PD
影响因子:
16
作者:
Fuste, Javier Miralles;Wanrooij, Sjoerd;Falkenberg, Maria
通讯作者:
Falkenberg, Maria