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• W2000986727 abstract "Background: The dsDNA bacteriophage PRD1 has a membrane inside its icosahedral capsid. While its large size (66 MDa) hinders the study of the complete virion at atomic resolution, a 1.65-Å crystallographic structure of its major coat protein, P3, is available. Cryo-electron microscopy (cryo-EM) and three-dimensional reconstruction have shown the capsid at 20–28 Å resolution. Striking architectural similarities between PRD1 and the mammalian adenovirus indicate a common ancestor.Results: The P3 atomic structure has been fitted into improved cryo-EM reconstructions for three types of PRD1 particles: the wild-type virion, a packaging mutant without DNA, and a P3-shell lacking the membrane and the vertices. Establishing the absolute EM scale was crucial for an accurate match. The resulting “quasi-atomic” models of the capsid define the residues involved in the major P3 interactions, within the quasi-equivalent interfaces and with the membrane, and show how these are altered upon DNA packaging.Conclusions: The new cryo-EM reconstructions reveal the structure of the PRD1 vertex and the concentric packing of DNA. The capsid is essentially unchanged upon DNA packaging, with alterations limited to those P3 residues involved in membrane contacts. These are restricted to a few of the N termini along the icosahedral edges in the empty particle; DNA packaging leads to a 4-fold increase in the number of contacts, including almost all copies of the N terminus and the loop between the two β barrels. Analysis of the P3 residues in each quasi-equivalent interface suggests two sites for minor proteins in the capsid edges, analogous to those in adenovirus." @default.
• W2000986727 created "2016-06-24" @default.
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• W2000986727 date "2001-10-01" @default.
• W2000986727 modified "2023-10-18" @default.
• W2000986727 title "Combined EM/X-Ray Imaging Yields a Quasi-Atomic Model of the Adenovirus-Related Bacteriophage PRD1 and Shows Key Capsid and Membrane Interactions" @default.
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• W2000986727 doi "https://doi.org/10.1016/s0969-2126(01)00642-6" @default.
• W2000986727 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11591347" @default.
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