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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Yun, D. F. Sherman, F. |
| Description | Author Affiliation: Yun DF ( Department of Biochemistry, University of Rochester, School of Medicine and Dentistry, NY 14642, USA.); |
| Abstract | Several studies have indicated that degradation of certain mRNAs is tightly coupled to their translation, whereas, in contrast, other observations suggested that translation can be inhibited without changing the stability of the mRNA. We have addressed this question with the use of altered CYC1 alleles, which encode iso-1-cytochrome c in the yeast Saccharomyces cerevisiae. The cyc1-1249 mRNA, which lacks all in-frame and out-of-frame AUG triplets, was as stable as the normal mRNA. This finding established that translation is not required for the degradation of CYC1 mRNAs. Furthermore, poly(G)18 tracks were introduced within the CYC1 mRNA translated regions to block exonuclease degradation. The recovery of 3' fragments revealed that the translatable and the AUG-deficient mRNAs are both degraded 5'-->3'. Also, the increased stability of CYC1 mRNAs in xrn1-delta strains lacking Xrn1p, the major 5'-->3' exonuclease, established that the normal and AUG-deficient mRNAs are degraded by the same pathway. In addition, deadenylylation, which activates the action of Xrn1p, occurred at equivalent rates in both normal and AUG-deficient mRNAs. We conclude that translation is not required for the normal degradation of CYC1 mRNAs, and that translatable and untranslated mRNAs are degraded by the same pathway. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 17 |
| Volume Number | 93 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1996-10-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cytochrome c Group Genetics Cytochromes c Exoribonucleases Protein Biosynthesis RNA, Fungal Metabolism RNA, Messenger Saccharomyces Cerevisiae Proteins Saccharomyces Cerevisiae Codon, Initiator Deoxyribonucleases Fungal Proteins Half-Life Molecular Sequence Data Mutagenesis Poly A Poly G Comparative Study Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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