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The 3′ End Formation in Small RNAs

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Small RNAs are a major class of RNAs along with transfer RNAs, ribosomal RNAs, and messenger RNAs. They vary in size from less than 100 nucleotides to several thousand nucleotides and have been identified and characterized both in prokaryotes and eukaryotes. Small RNAs participate in a variety of cellular functions including regulating RNA synthesis, RNA processing, guiding modifications in RNA, and in transport of proteins. Small RNAs are generated by a series of posttranscriptional processing steps following transcription. While RNA 5′ end structure, 5′ cap formation, and RNA processing mechanisms have been fairly well characterized, the 3′ end processing is poorly understood. Recent data point to an emerging theme in small RNAs metabolism in which the 3′ end processing is mediated by the exosome, a large multienzyme complex. In addition to removal of nucleotides by the exosome, there is simultaneous rebuilding of the 3′ end of some small RNA by adenylation and/or uridylation. This review presents a picture of both degradative and rebuilding reactions operative on the 3′ end of some small RNA molecules in prokaryotes and eukaryotes.
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Keywords: Small RNAs 3′ End formation 3′ Adenylation 3′ Uridylation

Document Type: Research Article

Affiliations: Department of Pharmacology, Baylor College of Medicine, Houston, TX 77030

Publication date: January 1, 2002

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