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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Haas, I. G. Zimmermann, R. Lerner, M. Dudek, J. Skowronek, M. H. Bies, C. Nastainczyk, W. Tyedmers, J. Heim, N. Volkmer, J. |
| Description | Author Affiliation: Tyedmers J ( Medizinische Biochemie und Molekularbiologie, Universität des Saarlandes, D-66421 Homburg, Germany.); |
| Abstract | Cotranslational protein transport into dog pancreas microsomes involves the Sec61p complex plus a luminal heat shock protein 70. Posttranslational protein transport into the yeast endoplasmic reticulum (ER) involves the so-called Sec complex in the membrane, comprising a similar Sec61p subcomplex, the putative signal peptide receptor subcomplex, and the heat shock protein 40-type subunit, Sec63p, plus a luminal heat shock protein 70. Recently, human homologs of yeast proteins Sec62p and Sec63p were discovered. Here we determined the concentrations of these two membrane proteins in dog pancreas microsomes and observed that the canine homologs of yeast proteins Sec62p and Sec63p are abundant proteins, present in almost equimolar concentrations as compared with Sec61alphap monomers. Furthermore, we detected fractions of these two proteins in association with each other as well as with the Sec61p complex. The J domain of the human Sec63p was shown to interact with immunoglobulin heavy chain binding protein. Thus, the membrane of the mammalian ER contains components, known from the posttranslationally operating protein translocase in yeast. We suggest that these components are required for efficient cotranslational protein transport into the mammalian ER as well as for other transport processes. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 13 |
| Volume Number | 97 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2000-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Fungal Proteins Genetics Metabolism Heat-Shock Proteins Membrane Proteins Membrane Transport Proteins Microsomes Pancreas Saccharomyces Cerevisiae Proteins Amino Acid Sequence Animals Molecular Sequence Data Ultrastructure Saccharomyces Cerevisiae Sequence Homology, Amino Acid Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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