This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Reprints and Permissions Copyright Information Books from ASM Press MicrobeWorld Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Sadhale, P P Articles by Platt, T Search for Related Content PubMed PubMed Citation Articles by Sadhale, P P Articles by Platt, T

 Previous Article  |  Next Article 

Mol Cell Biol. 1992 October; 12(10): 4262-4270

Unusual aspects of in vitro RNA processing in the 3' regions of the GAL1, GAL7, and GAL10 genes in Saccharomyces cerevisiae.

Department of Biochemistry, University of Rochester Medical Center, University of Rochester, New York 14642.

ABSTRACT

A striking feature of the 3'-end regions in polymerase II transcripts of Saccharomyces cerevisiae adjacent to their processing and polyadenylation sites is the lack of well-defined signal elements. Nonetheless, essential signals have seemed to be confined to compact regions in vivo, and we find that a short RNA with only 70 bases of GAL7 sequence upstream and 8 to 10 bases downstream of the poly(A) addition site is processed in vitro, as is an analogous CYC1 pre-RNA. Specific polyadenylation of a precleaved species further delimits the poly(A) signal and rules out obligatory coupling between cleavage and poly(A) addition. Although little proximal and even less distal sequence is required for accurate cleavage with CYC1 and GAL7, we have been unable to identify common features to which processing could be ascribed. We therefore turned to the coregulated set of genes in the galactose cluster (GAL1, GAL7, and GAL10) to assay their corresponding pre-mRNAs in vitro, in hopes of finding a common theme. By contrast to GAL7, short pre-mRNAs corresponding to GAL1 and GAL10 fail to be cleaved detectably, and only much longer transcripts are susceptible to processing. This indicates that signals, even if preserved, are more widely dispersed than the poly(A) addition site, and these results are unchanged whether extracts are from cells grown on glucose or galactose. As a further surprise, RNAs corresponding to the antisense orientation of the 3'-end regions of all three GAL genes are also effective substrates for the processing machinery in vitro. Computer analysis reveals the presence of polydisperse dyad symmetries that might account for these observations.

This article has been cited by other articles:

• Gross, S., Moore, C. L. (2001). Rna15 Interaction with the A-Rich Yeast Polyadenylation Signal Is an Essential Step in mRNA 3'-End Formation. Mol. Cell. Biol. 21: 8045-8055 [Abstract] [Full Text]  
• Sathyanarayana, U. G., Freeman, L. A., Lee, M.-S., Garrard, W. T. (1999). RNA Polymerase-specific Nucleosome Disruption by Transcription in Vivo. J. Biol. Chem. 274: 16431-16436 [Abstract] [Full Text]  
• Zhao, J., Hyman, L., Moore, C. (1999). Formation of mRNA 3' Ends in Eukaryotes: Mechanism, Regulation, and Interrelationships with Other Steps in mRNA Synthesis. Microbiol. Mol. Biol. Rev. 63: 405-445 [Abstract] [Full Text]