Abstract
Nearly all mRNAs are post-transcriptionally modified at their 5′ and 3′ ends, by capping and polyadenylation, respectively. These essential modifications are of course chemically quite distinct, as are the enzymatic complexes responsible for their synthesis. But recent studies have uncovered some similarities as well. For example, both involve entirely protein machinery, which is now the exception rather than the rule in RNA processing and modification reactions, and the two reactions share one important factor, namely RNA polymerase II. In this brief review, we describe progress in understanding the enzymes and factors that participate in these two processes, highlighting the evolutionary conservation, from yeast to humans, that has become apparent.
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Acknowledgements
We are grateful to Y. Takagaki and Y. Wen for help with the figures, and to I. Boluk and D. Hebenstreit for help preparing the manuscript. We regret not being able to cite a number of significant papers due to space limitations. Work in the authors' labs was supported by grants from the NIH.
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Shatkin, A., Manley, J. The ends of the affair: Capping and polyadenylation. Nat Struct Mol Biol 7, 838–842 (2000). https://doi.org/10.1038/79583
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DOI: https://doi.org/10.1038/79583
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