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Nucleic Acids Research, 1978, Vol. 5, No. 11 3977-3992
© 1978

Articles

Studies on spin labeled ribonucleic acids encapsulated by viral proteins

Ann Thomas Powell*,, Milton P. Gordon, William J. Caspary, James J. Greene and Paul O.P. Ts'o

Department of Biochemistry, University of Washington Seattle, WA, 98195, USA Division of Biophysics, The Johns Hopkins University 615 N.Wolfe Street, Baltimore, MD 21205, USA

Received October 10, 1978.

Spin labeled poly rA (sl-poly rA) was encapsulated by the coat proteins of two plant viruses having different morphologies: TMV, a rigid rod and CCMV, an icosahedral sphere. Electron microscopy showed that the resultant particles were morphologically similar to the parent virus from which the coat protein was obtained. Encapsulation produced progressive immobi1ization of the spin label. The motion of the spin label attached to TMV-sl-poly rA appears anisotropic with a correlation time about the long axis of approximately 5 x 10–6 sec. Exogenous nuclease had no effect on the epr spectrum of this nucleo-protein complex. The epr spectrum of CCMV-sl-poly rA was isotropic with a correlation time less than 5 x 10–7. CCMV-sl-poly rA was partially degraded by T2 ribonuclease. Theoretical calculations of correlation times for the motion of the nucleo-protein particles were similar to the experimentally derived values suggesting that the nucleo-protein particles are tightly packed with little potential for internal motion.

*Section of Infectious Disease, Kovler Viral Oncology Building, University of Chicago, 910 E.58th Street, Chicago, IL 60637, USA.


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