Structures of minute virus of mice replication initiator protein N-terminal domain: Insights into DNA nicking and origin binding.Tewary, S.K., Liang, L., Lin, Z., Lynn, A., Cotmore, S.F., Tattersall, P., Zhao, H., Tang, L.
(2014) Virology 476C: 61-71
- PubMed: 25528417
- DOI: https://doi.org/10.1016/j.virol.2014.11.022
- Primary Citation of Related Structures:
3WRN, 3WRO, 3WRQ, 3WRR, 3WRS, 4PP4, 4R94
- PubMed Abstract:
Members of the Parvoviridae family all encode a non-structural protein 1 (NS1) that directs replication of single-stranded viral DNA, packages viral DNA into capsid, and serves as a potent transcriptional activator. Here we report the X-ray structure of the minute virus of mice (MVM) NS1 N-terminal domain at 1.45Å resolution, showing that sites for dsDNA binding, ssDNA binding and cleavage, nuclear localization, and other functions are integrated on a canonical fold of the histidine-hydrophobic-histidine superfamily of nucleases, including elements specific for this Protoparvovirus but distinct from its Bocaparvovirus or Dependoparvovirus orthologs. High resolution structural analysis reveals a nickase active site with an architecture that allows highly versatile metal ligand binding. The structures support a unified mechanism of replication origin recognition for homotelomeric and heterotelomeric parvoviruses, mediated by a basic-residue-rich hairpin and an adjacent helix in the initiator proteins and by tandem tetranucleotide motifs in the replication origins.
Departments of Laboratory Medicine, Yale University Medical School, New Haven, CT 06510, USA; Departments of Genetics, Yale University Medical School, New Haven, CT 06510, USA.