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Circular Dichroism Studies on Southern Bean Mosaic Virus

Department of Chemical Sciences University of East Anglia, Norwich, U.K.
¹ John Innes Institute, Colney Lane, Norwich, U.K.

Circular dichroism spectra showed that the RNA of southern bean mosaic virus (SBMV) has considerable base pairing and that the protein subunit has a higher proportion of -structure than of -helix. A specific feature of the circular dichroism (CD) spectra of SBMV at 230 nm appears to be related to the binding of divalent cations to the virion; Ca²⁺ affects this CD spectral feature at a lower concentration than does Mg²⁺ or Sr²⁺. The CD spectra are compared with those of turnip rosette virus (TRosV), another member of the SBMV group.

Received 16 June 1980; accepted 14 November 1980.