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The vaccinia virus DNA helicase structure from combined single-particle cryo-electron microscopy and AlphaFold2 prediction
Please always quote using this URN: urn:nbn:de:bvb:20-opus-290523
- Poxviruses are large DNA viruses with a linear double-stranded DNA genome circularized at the extremities. The helicase-primase D5, composed of six identical 90 kDa subunits, is required for DNA replication. D5 consists of a primase fragment flexibly attached to the hexameric C-terminal polypeptide (res. 323–785) with confirmed nucleotide hydrolase and DNA-binding activity but an elusive helicase activity. We determined its structure by single-particle cryo-electron microscopy. It displays an AAA+ helicase core flanked by N- and C-terminalPoxviruses are large DNA viruses with a linear double-stranded DNA genome circularized at the extremities. The helicase-primase D5, composed of six identical 90 kDa subunits, is required for DNA replication. D5 consists of a primase fragment flexibly attached to the hexameric C-terminal polypeptide (res. 323–785) with confirmed nucleotide hydrolase and DNA-binding activity but an elusive helicase activity. We determined its structure by single-particle cryo-electron microscopy. It displays an AAA+ helicase core flanked by N- and C-terminal domains. Model building was greatly helped by the predicted structure of D5 using AlphaFold2. The 3.9 Å structure of the N-terminal domain forms a well-defined tight ring while the resolution decreases towards the C-terminus, still allowing the fit of the predicted structure. The N-terminal domain is partially present in papillomavirus E1 and polyomavirus LTA helicases, as well as in a bacteriophage NrS-1 helicase domain, which is also closely related to the AAA+ helicase domain of D5. Using the Pfam domain database, a D5_N domain followed by DUF5906 and Pox_D5 domains could be assigned to the cryo-EM structure, providing the first 3D structures for D5_N and Pox_D5 domains. The same domain organization has been identified in a family of putative helicases from large DNA viruses, bacteriophages, and selfish DNA elements.…
Author: | Stephanie Hutin, Wai Li Ling, Nicolas Tarbouriech, Guy Schoehn, Clemens Grimm, Utz Fischer, Wim P. Burmeister |
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URN: | urn:nbn:de:bvb:20-opus-290523 |
Document Type: | Journal article |
Faculties: | Fakultät für Biologie / Theodor-Boveri-Institut für Biowissenschaften |
Language: | English |
Parent Title (English): | Viruses |
ISSN: | 1999-4915 |
Year of Completion: | 2022 |
Volume: | 14 |
Issue: | 10 |
Article Number: | 2206 |
Source: | Viruses (2022) 14:10, 2206. https://doi.org/10.3390/v14102206 |
DOI: | https://doi.org/10.3390/v14102206 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Tag: | DNA helicase; DNA replication; Pfam domain; SF3 helicase; cryo-electron microscopy; helicase; orthopoxvirus; poxvirus; structure prediction |
Release Date: | 2023/09/22 |
Date of first Publication: | 2022/10/07 |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |