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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Navarro, Luis Edmundo, Cayama Triana, Juana Ledia Herrera, Flor Méndez, Yda Reggio, Ronald Ferreras, Ana Celia Triana-alonso, Francisco J. |
| Description | Author Affiliation: Triana JL ( Instituto de Investigaciones Biomédicas , Facultad de Ciencias de la Salud, Universidad de Carabobo, Sede Aragua, Venezuela.) |
| Abstract | ATP hydrolysis is important for different stages of the protein synthesis process. A novel effect of this nucleotide was detected using mRNAs isolated from S. cerevisiae after phenol extraction of polysomes. When polysomal mRNA (pmRNA) or $poly(A)^{+}$ RNA were preincubated with ATP (~ 3 mM, near physiological concentration), their translational activity in a cell-free system from yeast was stimulated 2–3 fold. This increased translational activity is specific for the $poly(A)^{+}$ RNA fraction, correlates with facilitated assembly of 80S initiation complexes, and is associated to increased synthesis of high molecular weight polypeptides. TCA precipitation assays of RNA incubated with $[^{14}C]ATP$ suggested an association of the nucleotide with the nucleic acid. The amount of $[^{14}C]ATP$ co-precipitated was dependent on magnesium (optimum at 5–6 mM), was partially inhibited by monovalent ions, and was maximal with $poli(A)^{+}$ RNA. Existence of RNA-associated kinases or ATPases appear unlikely since neither phosphorylation nor nucleotide hydrolysis were observed during preincubation of pmRNA with ATP. Another evidence of ATP-RNA interaction was an increased absorbance at 260 nm after incubation suggesting unwinding of the RNA secondary structure. Therefore, preincubation with ATP may affect the conformation of mRNAs and thereby facilitate the initiation of protein synthesis. This event could be part of an in vivo energy-dependent mechanism for translational control. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 3 |
| Volume Number | 1779 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2008-03-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Adenosine Triphosphate Physiology Peptide Chain Initiation, Translational Protein Biosynthesis RNA, Messenger Saccharomyces Cerevisiae Genetics Poly A Metabolism Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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