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Bovine papillomavirus type 1 outer capsidBovine papillomavirus type 1 outer capsid
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Structural highlights
Function[VL1_BPV1] Forms an icosahedral capsid with a T=7 symmetry and about 55 nm diameter. The capsid is composed of 72 pentamers linked to each other by disulfide bonds and associated with L2 proteins. The capsid encapsulates the genomic DNA, but does not bind DNA. Essential for the initial attachment to the host cell (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedPapillomaviruses, members of a group of dsDNA viruses associated with epithelial growths and tumors, have compact capsids assembled from 72 pentamers of the protein L1. We have determined the structure of bovine papillomavirus by electron cryomicrosopy (cryoEM), at approximately 3.6 A resolution. The density map, obtained from single-particle analysis of approximately 4,000 particle images, shows the trace of the L1 polypeptide chain and reveals how the N- and C-terminal "arms" of a subunit (extensions from its beta-jelly-roll core) associate with a neighboring pentamer. Critical contacts come from the C-terminal arm, which loops out from the core of the subunit, forms contacts (including a disulfide) with two subunits in a neighboring pentamer, and reinserts into the pentamer from which it emanates. This trace corrects one feature of an earlier model. We discuss implications of the structure for virion assembly and for pathways of infectious viral entry. We suggest that it should be possible to obtain image reconstructions of comparable resolution from cryoEM images of asymmetric particles. From the work on papillomavirus described here, we estimate that such a reconstruction will require about 1.5 million images to achieve the same number of averaged asymmetric units; structural variability will increase this number substantially. Subunit interactions in bovine papillomavirus.,Wolf M, Garcea RL, Grigorieff N, Harrison SC Proc Natl Acad Sci U S A. 2010 Apr 6;107(14):6298-303. Epub 2010 Mar 22. PMID:20308582[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences | |||||||||||||||