Neutron and Light Scattering Studies of Brome Mosaic Virus and its Protein
Brome Mosaic Virus (BMV; MW 4.6 106) is a small spherical plant virus of 133 Å radius which possesses a divided genome of single-stranded RNA (MW about 106) contained in a protein capsid which is composed of 180 copies of a single polypeptide of MW 20,300. The proteins are located at quasiequivalent crystallographic sites on an icosahedron of triangulation number T = 3: twelve pentamers form the vertices and twenty hexamers the faces of the icosahedron. The surface structure is occasionally visible on electron micrographs of negatively stained virus, and has been analyzed to 25 Å by image reconstruction of two-dimensional arrays1 of the closely related Cowpea Chlorotic Mottle Virus (Figure 1; Figure 2 shows a schematic view of the central protein arrangement visible in Figure 1).
KeywordsSmall Angle Neutron SCATTERING2 Protein Shell Sedimentation Equilibrium Molecular Weight Subunit Brome Mosaic Virus
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- 6.B. Jacrot and G. Zaccai, Biopolymers, in press.Google Scholar