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J Virol. 1968 July; 2(7): 738-744
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Physicochemical Properties of Tipula Iridescent Virus ¹

Department of Microbiology, The University of British Columbia, and Canada Department of Agriculture Research Station, Vancouver, British Columbia, Canada

ABSTRACT

The molecular weight of Tipula iridescent virus, based on sedimentation and diffusion coefficients, was 5.51 x 10⁸, with hydration of 0.57 g of water per g of virus. Deoxyribonucleic acid content, based on total inorganic phosphorus liberated, was 19 ± 0.2%. At 260 mµ, the virus gave an uncorrected absorbance of 18.2 cm²/mg of virus and a light-scattering corrected absorbance of 9.8 cm²/mg of virus. Amino acid analyses of the virus protein revealed a remarkable similarity to Sericesthis iridescent virus. The possibility is discussed that the four iridescent insect viruses reported to date bear a strain relationship.

¹ Joint publication, Department of Microbiology, University of British Columbia, and Contribution no. 144, Canada Department of Agriculture Research Station, Vancouver, B.C., Canada. Taken in part from a thesis submitted to the Department of Microbiology, University of British Columbia, in partial fulfillment of the requirements for the Ph.D. degree.