| GWT1 gene is required for inositol acylation of glycosylphosphatidylinositol anchors in yeast. | |
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MedLine Citation:
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PMID: 12714589 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Glycosylphosphatidylinositol (GPI) is a conserved post-translational modification to anchor cell surface proteins to plasma membrane in all eukaryotes. In yeast, GPI mediates cross-linking of cell wall mannoproteins to beta1,6-glucan. We reported previously that the GWT1 gene product is a target of the novel anti-fungal compound, 1-[4-butylbenzyl]isoquinoline, that inhibits cell wall localization of GPI-anchored mannoproteins in Saccharomyces cerevisiae (Tsukahara, K., Hata, K., Sagane, K., Watanabe, N., Kuromitsu, J., Kai, J., Tsuchiya, M., Ohba, F., Jigami, Y., Yoshimatsu, K., and Nagasu, T. (2003) Mol. Microbiol. 48, 1029-1042). In the present study, to analyze the function of the Gwt1 protein, we isolated temperature-sensitive gwt1 mutants. The gwt1 cells were normal in transport of invertase and carboxypeptidase Y but were delayed in transport of GPI-anchored protein, Gas1p, and were defective in its maturation from the endoplasmic reticulum to the Golgi. The incorporation of inositol into GPI-anchored proteins was reduced in gwt1 mutant, indicating involvement of GWT1 in GPI biosynthesis. We analyzed the early steps of GPI biosynthesis in vitro by using membranes prepared from gwt1 and Deltagwt1 cells. The synthetic activity of GlcN-(acyl)PI from GlcN-PI was defective in these cells, whereas Deltagwt1 cells harboring GWT1 gene restored the activity, indicating that GWT1 is required for acylation of inositol during the GPI synthetic pathway. We further cloned GWT1 homologues in other yeasts, Cryptococcus neoformans and Schizosaccharomyces pombe, and confirmed that the specificity of acyl-CoA in inositol acylation, as reported in studies of endogenous membranes (Franzot, S. P., and Doering, T. L. (1999) Biochem. J. 340, 25-32), is due to the properties of Gwt1p itself and not to other membrane components. |
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Authors:
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Mariko Umemura; Michiyo Okamoto; Ken-ichi Nakayama; Koji Sagane; Kappei Tsukahara; Katsura Hata; Yoshifumi Jigami |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, P.H.S. Date: 2003-04-24 |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 278 ISSN: 0021-9258 ISO Abbreviation: J. Biol. Chem. Publication Date: 2003 Jun |
Date Detail:
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Created Date: 2003-06-23 Completed Date: 2003-08-20 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: United States |
Other Details:
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Languages: eng Pagination: 23639-47 Citation Subset: IM |
Affiliation:
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Research Center for Glycoscience, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 6, Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan. |
| Data Bank Information | |
Bank Name/Acc. No.:
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GENBANK/AB092505 |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Acyl Coenzyme A
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metabolism Acylation Amino Acid Sequence Glycosylphosphatidylinositols / biosynthesis*, metabolism Inositol / metabolism Molecular Sequence Data Mutation Protein Transport Saccharomyces cerevisiae Proteins / genetics*, physiology Sequence Alignment Substrate Specificity Temperature Yeasts / metabolism* |
| Grant Support | |
ID/Acronym/Agency:
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AI147079/AI/NIAID NIH HHS; U01 AI47087/AI/NIAID NIH HHS; U01 AI48594/AI/NIAID NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Acyl Coenzyme A; 0/GWT1 protein, S cerevisiae; 0/Glycosylphosphatidylinositols; 0/Saccharomyces cerevisiae Proteins; 6917-35-7/Inositol |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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