NDLI: Faithful degradation of soybean rbcS mRNA in vitro.

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Faithful degradation of soybean rbcS mRNA in vitro.

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Faithful degradation of soybean rbcS mRNA in vitro.

Content Provider	PubMed Central
Author	Tanzer, M. M. Meagher, R. B.
Abstract	The mRNA encoding the soybean rbcS gene, SRS4, is degraded into a set of discrete lower-molecular-weight products in light-grown soybean seedlings and in transgenic petunia leaves. The 5'-proximal products have intact 5' ends, lack poly(A) tails, lack various amounts of 3'-end sequences, and are found at higher concentrations in the polysomal fraction. To study the mechanisms of SRS4 mRNA decay more closely, we developed a cell-free RNA degradation system based on a polysomal fraction isolated from soybean seedlings or mature petunia leaves. In the soybean in vitro degradation system, endogenous SRS4 mRNA and proximal product levels decreased over a 6-h time course. When full-length in vitro-synthesized SRS4 RNAs were added to either in vitro degradation system, the RNAs were degraded into the expected set of proximal products, such as those observed for total endogenous RNA samples. When exogenously added SRS4 RNAs already truncated at their 3' ends were added to either system, they too were degraded into the expected subset of proximal products. A set of distal fragments containing intact 3' ends and lacking various portions of 5'-end sequences were identified in vivo when the heterogeneous 3' ends of the SRS4 RNAs were removed by oligonucleotide-directed RNase H cleavage. Significant amounts of distal fragments which comigrated with the in vivo products were also observed when exogenous SRS4 RNAs were degraded in either in vitro system. These proximal and distal products lacking various portions of their 3' and 5' sequences, respectively, were generated in essentially a random order, a result supporting a nonprocessive mechanism. Tagging of the in vitro-synthesized RNAs on their 5' and 3' ends with plasmid vector sequences or truncation of the 3' end had no apparent effect on the degradation pattern. Therefore, RNA sequences and/or structures in the immediate vicinity of each 3' end point may be important in the degradation machinery. Together, these data suggest that SRS4 mRNA is degraded by a stochastic mechanism and that endonucleolytic cleavage may be the initial event. These plant in vitro systems should be useful in identifying the cis- and trans-acting factors involved in the degradation of mRNAs.
Starting Page	2640
File Format	PDF
ISSN	10985549
e-ISSN	10985549
Journal	Molecular and Cellular Biology
Issue Number	4
Volume Number	14
Language	English
Publisher Date	1994-04-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology

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