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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Schmid, F. X. Schönbrunner, E. R. |
| Description | Author Affiliation: Schönbrunner ER ( Biochemisches Laboratorium, Universität Bayreuth, Federal Republic of Germany.); |
| Abstract | The cis-trans isomerization of prolyl peptide bonds and the formation of disulfide bonds are both slow steps in protein folding. By using ribonuclease T1 as a model system, we show that these two processes can become linked in the oxidative folding of reduced proteins and that the formation of the correct disulfide bonds is facilitated in the presence of peptidyl-prolyl cis-trans isomerase. In particular, the efficiency of protein disulfide isomerase (EC 5.3.4.1) as a catalyst of disulfide bond formation in the course of oxidative folding is markedly improved when peptidyl-prolyl cis-trans isomerase is present simultaneously. Possibly, unfolded or partially folded protein chains with correct prolyl isomers are better substrates for catalysis by protein disulfide isomerase. The interdependence of the two enzymatic activities detected during in vitro folding experiments could be of importance for the de novo folding and disulfide bond formation of nascent proteins in the endoplasmic reticulum. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 10 |
| Volume Number | 89 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1992-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Amino Acid Isomerases Metabolism Carrier Proteins Isomerases Protein Conformation Ribonuclease T1 Animals Cloning, Molecular Escherichia Coli Enzymology Genetics Kinetics Liver Oxidation-Reduction Peptidylprolyl Isomerase Protein Denaturation Protein Disulfide-Isomerases Recombinant Proteins Chemistry Time Factors Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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