Point mutations in AAUAAA and the poly (A) addition site: effects on the accuracy and efficiency of cleavage and polyadenylation in vitro (original) (raw)

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Department of Biochemistry, College of Agriculture and Life Sciences, University of Wisconsin

Madison, WI 53706, USA

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Department of Biochemistry, College of Agriculture and Life Sciences, University of Wisconsin

Madison, WI 53706, USA

*To whom correspondence should be addressed

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+Present address: Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143, USA

Author Notes

Revision received:

05 September 1990

Accepted:

05 September 1990

Published:

11 October 1990

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Michael D. Sheets, Stephen C. Ogg, Marvin P. Wickens, Point mutations in AAUAAA and the poly (A) addition site: effects on the accuracy and efficiency of cleavage and polyadenylation in vitro, Nucleic Acids Research, Volume 18, Issue 19, 11 October 1990, Pages 5799–5805, https://doi.org/10.1093/nar/18.19.5799
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Abstract

Three sequences in the vicinity of poly (A) addition sites are conserved among vertebrate mRNAs. We analyze the effects of single base changes in each position of AAUAAA and in the nucleotlde to which poly (A) is added on 3′ end formation in vitro. All 18 possible single base changes of the AAUAAA sequence greatly reduce addition of poly (A) to RNAs that end at the poly (A) addition site, and prevent cleavage of RNAs that extend beyond. The magnitude of reduction varies greatly with the position changed and the base introduced. For any given mutation, cleavage and polyadenylation are reduced to similar extents, strongly suggesting that the same factor interacts with AAUAAA in both reactions. Mutations at and near the conserved adenosine to which poly (A) Is added disturb the accuracy, but not the efficiency, of 3′ end formation. For example, point mutations at the conserved adenosine shift the 3′ end of the most abundant 5′ half-molecule downstream by a single nucleotide. The mechanism by which these mutations might exert their effects on the precision of 3′ end formation are discussed.

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Author notes

+Present address: Department of Biochemistry and Biophysics, University of California, San Francisco, CA 94143, USA

© 1990 Oxford University Press

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