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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Justesen, J. Fleckner, J. Rasmussen, H. H. |
| Description | Author Affiliation: Fleckner J ( Department of Molecular Biology, University of Aarhus, Denmark.); |
| Abstract | An interferon gamma (IFN-gamma)-inducible protein, gamma 2, was identified by two-dimensional gel electrophoresis of transformed human amnion (AMA) cell proteins. cDNA clones coding for this protein have been isolated and characterized as encoding a polypeptide with a predicted molecular weight of 53,165 and a pI of 6.16. Both values are in good agreement with those observed in two-dimensional gel electrophoresis. The gamma 2 protein is found to be highly induced by IFN-gamma, whereas no induction was seen after addition of IFN-alpha to AMA cells. A gamma 2-specific 2.7-kilobase mRNA was likewise seen to accumulate selectively in response to IFN-gamma in these cells. Comparison of the predicted amino acid sequence of gamma 2 to proteins in GenBank data bases revealed that gamma 2 is highly homologous to rabbit peptide chain release factor [Lee, C. C., Craigen, W. J., Muzny, D. M., Harlow, E. & Caskey, C. T. (1990) Proc. Natl. Acad. Sci. USA 87, 3508-3512] and bovine tryptophanyl-tRNA synthetase [M. Garret, V. Trezeguet, B. Pajot, J. C. Gandar, M. Merle, M. Guegiev, J. P. Benedetto, C. Sarger, J. Alteriot, J. La Bouessec, J. Labouesse, and J. Bonnet (1990), GenBank accession no. X52113]. Amino acid sequence similarities of 94% and 97%, respectively, are found, which in general would indicate that gamma 2 represents the human equivalent to either of these two mammalian genes. Based on these sequence similarities, the current data raise the possibility that tryptophanyl-tRNA charging and peptide chain release are carried out by the same enzyme. The gamma 2 protein is shown to possess tryptophan-dependent aminoacyl-tRNA synthetase activity and thus constitutes an enzymatic activity involved in the biological activity of IFN-gamma. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 24 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Interferon-gamma Pharmacology Peptide Termination Factors Genetics Proteins Tryptophan-tRNA Ligase Amino Acid Sequence Amnion Drug Effects Physiology Animals Blotting, Northern Cells, Cultured Molecular Sequence Data Oligodeoxyribonucleotides Metabolism Polymerase Chain Reaction Protein Biosynthesis RNA, Messenger Rabbits Recombinant Proteins Sequence Homology, Nucleic Acid Transcription, Genetic Comparative Study Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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