Dissecting the role of dolichol in cell wall assembly in the yeast mutants impaired in early glycosylation reactions

被引:24
作者
Orlowski, Jacek
Machula, Katarzyna
Janik, Anna
Zdebska, Ewa
Palamarczyk, Grazyna
机构
[1] Polish Acad Sci, Inst Biochem & Biophys, PL-02106 Warsaw, Poland
[2] Inst Hematol & Blood Transfus, Warsaw, Poland
关键词
dolichol; protein glycosylation; cell wall; SACCHAROMYCES-CEREVISIAE; MEMBRANE-PROTEIN; O-MANNOSYLATION; SYNTHASE; BIOSYNTHESIS; GLYCOPROTEIN; MUTATIONS; PLASMIDS; PATHWAY; FAMILY;
D O I
10.1002/yea.1479
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Evidence is presented that temperature-sensitive Saccharomyces cerevisiae mutants, impaired in dolichol kinase (Sec59p) or dollichyl phosphate mannose synthase (Dpm1p) activity have an aberrant cell wall composition and ultrastructure. The mutants were oversensitive to Calcofluor white, an agent interacting with the cell wall chitin. In accordance with this, chemical analysis of the cell wall alkali-insoluble fraction indicated an increased amount of chitin and changes in the quantity of beta 1,6- and beta 1,3-glucan in sec59-1 and dpml-6 mutants. In order to unravel the link between the formation of dolichyl phosphate and dolichyl phosphate mannose and the cell wall assembly, we screened a yeast genomic library for a multicopy suppressors of the thermosensitive phenotype. The RER2 and SRT1 genes, encoding cis-prenyltransferases, were isolated. In addition, the ROT1 gene, encoding protein involved in beta 1,6-glucan synthesis (Machi et al., 2004) and protein folding (Takeuchi et al., 2006) acted as a multicopy suppressor of the temperature-sensitive phenotype of the sec59-1 mutant. The cell wall of the mutants and of mutants bearing the multicopy suppressors was analysed for carbohydrate and mannoprotein content. We also examined the glycosylation status of the plasma membrane protein Gas1p, a beta 1,3-glucan elongase, and the degree of phosphorylation of the Mpk1/Slt2 protein, involved in the cell wall integrity pathway. Copyright (c) 2007 John Wiley & Sons, Ltd.
引用
收藏
页码:239 / 252
页数:14
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