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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Davis, L. I. Blobel, G. |
| Description | Author Affiliation: Davis LI ( Laboratory of Cell Biology, Howard Hughes Medical Institute, Rockefeller University, New York, NY 10021.); |
| Abstract | Using a monoclonal antibody (mAb 414), we previously identified a protein of 62 kDa (p62) that was localized to the nuclear pore complex by immunoelectron microscopy. We also showed that p62 binds specifically to wheat germ agglutinin. Therefore, we proposed that this nuclear pore complex protein might be a member of a recently characterized family of glycoproteins that are labeled by in vitro galactosylation of rat liver nuclei and contain O-linked monosaccharidic GlcNAc residues. In support of this, we now show that incubation with N-acetylglucosaminidase reduces the molecular mass of p62 by approximately 3 kDa because of the removal of terminal GlcNAc residues. Moreover, p62 can be galactosylated in vitro by using UDP-[3H]galactose and galactosyltransferase. We also show that most of the GlcNAc residues are added within 5 min of synthesis, when p62 is soluble and cytosolic. Thus, the addition of GlcNAc is carried out in the cytoplasm and is clearly distinct from the N- and O-linked glycosylation pathways of the endoplasmic reticulum and Golgi complex. Using another mAb with a broad specificity for nuclear GlcNAc-containing proteins, we show by immunofluorescence and protein blotting of subnuclear fractions that some of these proteins are in the interior of the nucleus, and others are most likely located in the pore complex. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 21 |
| Volume Number | 84 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1987-12-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Glycoproteins Biosynthesis Liver Metabolism Nuclear Envelope Animals Antibodies, Monoclonal Antigen-Antibody Complex Fluorescent Antibody Technique Glycoside Hydrolases Kinetics Molecular Weight Peptide Mapping Rats, Inbred BUF Uridine Diphosphate Galactose Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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