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JBC, Vol. 250, Issue 20, 8098-8104, Oct, 1975

Heterogneeous 5'-terminal structures occur on vesicular stomatitis virus mRNAs

J. K. Rose

Four alternative structures occur at the 5' ends of vesicular stomatitis virus mRNAs synthesized in infected cells and are separated conveniently by a technique described here. Sixty-five to seventy per cent of the mRNA molecules have the 5' end structure m7G5'ppp5'(m)AmpAp and about 20% have a more highly modified structure m7G5'ppp5'(m)AmpmAmpCp. The base of the first adenosine in each sequence is methylated in about one-half of the ends of each type and kinetic experiments suggest that the latter sequence is derived from the former by further methylations. The remaining 10 to 15% of the 5' ends are pppAp and pppGp in approximately equimolar yields. This heterogeneity with respect to 5' end structure is found within each of the vesicular stomatitis virus mRNA species examined. The mRNA molecules with 5'-triphosphate ends accumulate throughout the infection but are not found on ribosomes, suggesting that they lack a structure(s) required for ribosome recognition. In contrast to mRNA, virion RNA has a single 5' end structure, pppAp.
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