The yeast peptidyl proline isomerases FPR3 and FPR4, in high copy numbers, suppress defects resulting from the absence of the E3 ubiquitin ligase TOM1

被引:13
作者
Davey, M [1 ]
Hannam, C [1 ]
Wong, C [1 ]
Brandl, CJ [1 ]
机构
[1] Univ Western Ontario, Dept Biochem, London, ON N6A 5C1, Canada
来源
MOLECULAR AND GENERAL GENETICS | 2000年 / 263卷 / 03期
基金
英国医学研究理事会;
关键词
ubiquitin ligase; peptidyl proline isomerase; yeast; multicopy suppression; Tom1p;
D O I
10.1007/s004380051197
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
Tom1p is a 3268-amino acid protein with extensive homology to the hect-domain class of E3 ubiquitin ligases. Disruption of the TOM1 gene results in temperature sensitivity for growth. Genes encoding the peytidyl proline isomerases Fpr3p and Fpr4p, when present on multicopy plasmids, will suppress this temperature-sensitive growth phenotype. FPR3 can also suppress the mating defect seen in tom1 strains. Suppression is specific for disruption of TOM1, since FPR3 does not restore wild-type growth to strains lacking the E2 ubiquitin-conjugating enzyme Rad6p or the transcriptional regulator Ngg1p. Interestingly, the peptidyl proline isomerase domains of Fpr3p and Fpr4p are not required for suppression; rather the essential sequences include about 170 highly conserved residues at the proteins' N-termini. Previously we found that Tom1p plays a role in gene regulation. Since overexpression of FPR4 does not suppress the reduced expression of the ARG1 promoter found in tom1 deletion strains, Tom1p probably has one or more functions beyond its involvement in gene expression.
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页码:520 / 526
页数:7
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