The T = 3 capsid of southern bean mosaic virus is analyzed in detail. The beta-sheets of the beta-barrel folding motif that form the subunits show a high degree of twist, generated by several beta-bulges. Only 34 water molecules were identified in association with the three quasi-equivalent subunits, most of them on the external viral surface ...
The T = 3 capsid of southern bean mosaic virus is analyzed in detail. The beta-sheets of the beta-barrel folding motif that form the subunits show a high degree of twist, generated by several beta-bulges. Only 34 water molecules were identified in association with the three quasi-equivalent subunits, most of them on the external viral surface. Subunit contacts related by quasi-3-fold axes are similar, are dominated by polar interactions and have almost identical calcium binding sites. There is no metal ion on the quasi-3-fold axis, as previously reported. Subunits related by quasi-2-fold and icosahedral 2-fold axes have different contacts but nevertheless display almost identical interactions between the antiparallel helices alpha A. A dipole-dipole type interaction between these helices may produce an energetically stable hinge that allows two types of dimers in a T = 3 assembly. The temperature factor distribution, the hydrogen-bonding pattern, and the contacts across the icosahedral 2-fold axes suggest that one of the dimer types is present in the intact virion and probably also in solution; the other is produced only during capsid assembly. Interactions along the 5-fold axes are mainly polar and possibly form an ion channel. The beta-sheet structures of the three subunits can be superimposed with considerable precision. Significant relative distortions between quasi-equivalent subunits occur mainly in helices and loops. The two dimeric forms and the subunit distortions are the consequence of the non-equivalent subunit environments in the capsid.
Structural Comparisons of Small Spherical Plant Viruses Rossmann, M.G., Abad-Zapatero, C., Murthy, M.R., Liljas, L., Jones, T.A., Strandberg, B. (1983) J Mol Biol 165: 711
Amino Acid Sequence of Southern Bean Mosaic Virus Coat Protein and its Relation to the Three-Dimensional Structure of the Virus Hermodson, M.A., Abad-Zapatero, C., Abdel-Meguid, S.S., Pundak, S., Rossmann, M.G., Tremaine, J.H. (1982) Virology 119: 133
A Description of Techniques Used in the Structure Determination of Southern Bean Mosaic Virus at 2.8 Angstroms Resolution Abad-Zapatero, C., Abdel-Meguid, S.S., Johnson, J.E., Leslie, A.G.W., Rayment, I., Rossmann, M.G., Suck, D., Tsukihara, T. (1981) Acta Crystallogr B 37: 2002
Southern Bean Mosaic Virus at 2.8 Angstroms Resolution Abad-Zapatero, C., Abdel-Meguid, S.S., Johnson, J.E., Leslie, A.G.W., Rayment, I., Rossmann, M.G., Suck, D., Tsukihara, T. (1980) Nature 286: 33
The Structure of Southern Bean Mosaic Virus at 5 Angstroms Resolution Suck, D., Rayment, I., Johnson, J.E., Rossmann, M.G. (1978) Virology 85: 187
An 11 Angstroms-Resolution Electron Density Map of Southern Bean Mosaic Virus Rayment, I., Johnson, J.E., Suck, D., Akimoto, T., Rossmann, M.G., Lonberg-Holm, K., Korant, B.D. (1978) Acta Crystallogr B 34: 567
The Structure of Southern Bean Mosaic Virus at 22.5 Angstroms Resolution Johnson, J.E., Akimoto, T., Suck, D., Rayment, I., Rossmann, M.G. (1976) Virology 75: 394
Organizational Affiliation:
Departamento de Fisica, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Argentina.
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