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Content Provider | World Health Organization (WHO)-Global Index Medicus |
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Author | Klaff, P. Schuster, G. Lisitsky, I. |
Description | Author Affiliation: Lisitsky I ( Department of Biology, Technion-Israel Institute of Technology, Haifa, Israel.); |
Abstract | In this work, we report the posttranscriptional addition of poly(A)-rich sequences to mRNA in chloroplasts of higher plants. Several sites in the coding region and the mature end of spinach chloroplast psbA mRNA, which encodes the D1 protein of photosystem II, are detected as polyadenylylated sites. In eukaryotic cells, the addition of multiple adenosine residues to the 3' end of nuclear RNA plays a key role in generating functional mRNAs and in regulating mRNA degradation. In bacteria, the adenylation of several RNAs greatly accelerates their decay. The poly(A) moiety in the chloroplast, in contrast to that in eukaryotic nuclear encoded and bacterial RNAs, is not a ribohomopolymer of adenosine residues, but clusters of adenosines bounded mostly by guanosines and rarely by cytidines and uridines; it may be as long as several hundred nucleotides. Further analysis of the initial steps of chloroplast psbA mRNA decay revealed specific endonuclease cleavage sites that perfectly matched the sites where poly(A)-rich sequences were added. Our results suggest a mechanism for the degradation of psbA mRNA in which endonucleolytic cleavages are followed by the addition of poly(A)-rich sequences to the upstream cleavage products, which target these RNAs for rapid decay. |
ISSN | 00278424 |
e-ISSN | 10916490 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Issue Number | 23 |
Volume Number | 93 |
Language | English |
Publisher | National Academy of Sciences |
Publisher Date | 1996-12-01 |
Publisher Place | United States |
Access Restriction | Open |
Subject Keyword | Chloroplasts Metabolism RNA Processing, Post-Transcriptional RNA, Messenger DNA Primers Molecular Sequence Data Photosynthetic Reaction Center Complex Proteins Biosynthesis Photosystem II Protein Complex Poly A Chemistry RNA, Plant Ribonucleases Spinacia Oleracea Research Support, Non-U.S. Gov't Multidisciplinary |
Content Type | Text |
Resource Type | Article |
Subject | Multidisciplinary |
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