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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Rom, E. Kahana, C. |
| Description | Author Affiliation: Rom E ( Department of Molecular Genetics and Virology, Weizmann Institute of Science, Rehovot, Israel.); |
| Abstract | We provide here an example of a mammalian cellular gene expressed by frame-shifting. Conventional reading of the sequence of ornithine decarboxylase-antizyme mRNA (a protein that modulates the rate of ornithine decarboxylase degradation) results in premature termination at an in-frame termination codon (stop-1), located shortly after the initiation codon. By translating, in vitro in reticulocyte lysate, antizyme mRNA with a full coding capacity and various mutants derived from it, we demonstrate that antizyme expression requires that ribosomes shift from the first open reading frame (termed ORF0) to a second +1 open reading frame (ORF1). Our studies show that this frame-shifting, which occurs at maximal efficiency of approximately 20%, is stimulated by polyamines and requires the functional integrity of the stop codon (stop-1) of ORF0. By introducing in-frame deletions, we have shown that an 87-nt segment surrounding stop-1 enhances frame-shifting efficiency, whereas the 6 nt located just upstream to stop-1 are absolutely essential for this process. Because this segment does not contain sequences that were previously characterized as shifty segments, our results suggest that another mechanism of frame-shifting is involved in mediating antizyme expression. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 9 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Ornithine Decarboxylase Genetics Polyamines Pharmacology Protein Biosynthesis Drug Effects Proteins Amino Acid Sequence Animals Gene Expression Regulation, Enzymologic In Vitro Techniques Molecular Sequence Data Mutagenesis, Site-Directed Peptide Chain Initiation, Translational Peptide Chain Termination, Translational RNA, Messenger Ribosomes Metabolism Structure-Activity Relationship Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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