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Nucleotide Sequence of RNA 2 of a Czechoslovakian Isolate of Red Clover Necrotic Mosaic Virus

A. C. Marriott

Department of Biology, Imperial College of Science, Technology and Medicine, London SW7 2BB, U.K.

The complete nucleotide sequence (1448 nucleotides) of RNA 2 of a Czechoslovakian isolate TpM-34 of red clover necrotic mosaic virus (RCNMV-TpM-34) has been determined. The sequence contained one major open reading frame (ORF) with the potential to encode a protein of 326 amino acids (M_r 35755), designated P2. The nucleotide sequence of RNA 2 of RCNMV-TpM-34 and the previously published sequence of RNA 2 of an Australian isolate of the virus (RCNMV-Aus) were 83% identical and there was 80% amino acid sequence identity between the P2 proteins of these isolates. However the N-terminal two-thirds of the P2 proteins shared a higher degree of similarity than the C-terminal regions which were predicted to have a more flexible structure. An ORF in the 3' portion of RNA 2 of RCNMV-Aus, which could encode a protein of M_r 5000, was not present in RNA 2 of RCNMV-TpM-34. RNAs 1 and 2 of RCNMV-TpM-34 and RCNMV-Aus are bilaterally compatible.

Present address: NERC Institute of Virology and Environmental Microbiology, Mansfield Road, Oxford OX1 3SR, U.K.

Received 16 July 1990; accepted 12 October 1990.