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N-Acetyl-tyrosine at the 3' End of Brome Mosaic Virus RNA has Little Effect on Infectivity

Paula A. Kiberstis

Biophysics Laboratory of the Graduate School, University of Wisconsin, Madison, Wisconsin 53706, U.S.A.

Digestion of the N-acetylated-tyrosylated form of brome mosaic virus (BMV) RNA with proteinase K removed the 3'-blocking N-acetyl-tyrosine residue. Removal of the blocking group affected neither infectivity nor mRNA activity. The previously reported effect of acetylation of tyrosylated BMV RNA on infectivity appears to result from non-specific acetylation of the RNA.

Keywords: BMV, RNA modification, aminoacylation, proteinase K

Present address: MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, U.K.

Received 29 March 1983; accepted 31 May 1983.