The crystallographic structure of brome mosaic virus

Journal of Molecular Biology
Robert W LucasA McPherson

Abstract

The structure of brome mosaic virus (BMV), the type member of the bromoviridae family, has been determined from a single rhombohedral crystal by X-ray diffraction, and refined to an R value of 0.237 for data in the range 3.4-40.0 A. The structure, which represents the native, compact form at pH 5.2 in the presence of 0.1 M Mg(2+), was solved by molecular replacement using the model of cowpea chlorotic mottle virus (CCMV), which BMV closely resembles. The BMV model contains amino acid residues 41-189 for the pentameric capsid A subunits, and residues 25-189 and 1-189 for the B and C subunits, respectively, which compose the hexameric capsomeres. In the model there are two Mg ions and one molecule of polyethylene glycol (PEG). The first 25 amino acid residues of the C subunit are modeled as polyalanine. The coat protein has the canonical "jellyroll" beta-barrel topology with extended amino-terminal polypeptides as seen in other icosahedral plant viruses. Mass spectrometry shows that in native BMV virions, a significant fraction of the amino-terminal peptides are apparently cleaved. No recognizable nucleic acid residue is visible in the electron density maps except at low resolution where it appears to exhibit a layered arrangemen...Continue Reading

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