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Conformational Studies on Particles of Turnip Yellow Mosaic Virus

P. Piazzolla

D. Gallitelli

^* Istituto di Chimica analitica, Università di Padova, and Centro per lo Studio della Stabilità e Reattività dei Composti di Coordinazione, C.N.R.
Istituto di Patologia Vegetale, Università di Bari, Italy

Circular dichroism studies (CD) of turnip yellow mosaic virus (TYMV) nucleoprotein and of its isolated RNA and capsid revealed that: (i) the nucleic acid structure, which comprises a considerable amount of base pairing and/or stacking, remains essentially unchanged irrespective of whether the RNA is encapsidated or free; (ii) the secondary structure of the protein component is mainly accounted for by - and irregular forms without appreciable amounts of -helix; (iii) the interaction of capsid protein and RNA induces some conformational changes in the protein probably involving a decrease of -structure and a perturbation of the microenvironment of some aromatic residues. The influence of temperature on the CD spectra of virus nucleoprotein, RNA and capsid was also investigated. The results are discussed in connection with particle stability.

Received 21 October 1977; accepted 1 March 1978.