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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Price, E. R. Baker, C. H. Mckeon, F. D. Walsh, C. T. Zydowsky, L. D. Jin, M. J. |
| Description | Author Affiliation: Price ER ( Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115.); |
| Abstract | We report the cloning and characterization of a cDNA encoding a second human cyclosporin A-binding protein (hCyPB). Homology analyses reveal that hCyPB is a member of the cyclophilin B (CyPB) family, which includes yeast CyPB, Drosophila nina A, and rat cyclophilin-like protein. This family is distinguished from the cyclophilin A (CyPA) family by the presence of endoplasmic reticulum (ER)-directed signal sequences. hCyPB has a hydrophobic leader sequence not found in hCyPA, and its first 25 amino acids are removed upon expression in Escherichia coli. Moreover, we show that hCyPB is a peptidyl-prolyl cis-trans isomerase which can be inhibited by cyclosporin A. These observations suggest that other members of the CyPB family will have similar enzymatic properties. Sequence comparisons of the CyPB proteins show a central, 165-amino acid peptidyl-prolyl isomerase and cyclosporin A-binding domain, flanked by variable N-terminal and C-terminal domains. These two variable regions may impart compartmental specificity and regulation to this family of cyclophilin proteins containing the conserved core domain. Northern blot analyses show that hCyPB mRNA is expressed in the Jurkat T-cell line, consistent with its possible target role in cyclosporin A-mediated immunosuppression. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 88 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1991-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amino Acid Isomerases Genetics Carrier Proteins Multigene Family Protein Sorting Signals Metabolism Amino Acid Sequence Cell Line Cloning, Molecular Endothelium, Vascular Enzymology Escherichia Coli Gene Library Kinetics Molecular Sequence Data Oligonucleotide Probes Peptidylprolyl Isomerase Polymerase Chain Reaction Sequence Homology, Nucleic Acid Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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