Document Detail

Functional domains of the Rsp5 ubiquitin-protein ligase.
MedLine Citation:
PMID:  9858558     Owner:  NLM     Status:  MEDLINE    
RSP5, an essential gene of Saccharomyces cerevisiae, encodes a hect domain E3 ubiquitin-protein ligase. Hect E3 proteins have been proposed to consist of two broad functional domains: a conserved catalytic carboxyl-terminal domain of approximately 350 amino acids (the hect domain) and a large, nonconserved amino-terminal domain containing determinants of substrate specificity. We report here the mapping of the minimal region of Rsp5 necessary for its essential in vivo function, the minimal region necessary to stably interact with a substrate of Rsp5 (Rpb1, the large subunit of RNA polymerase II), and the finding that the hect domain, by itself, is sufficient for formation of the ubiquitin-thioester intermediate. Mutations within the hect domain that affect either the ability to form a ubiquitin-thioester or to catalyze substrate ubiquitination abrogate in vivo function, strongly suggesting that the ubiquitin-protein ligase activity of Rsp5 is intrinsically linked to its essential function. The amino-terminal region of Rsp5 contains three WW domains and a C2 calcium-binding domain. Two of the three WW domains are required for the essential in vivo function, while the C2 domain is not, and requirements for Rpb1 binding and ubiquitination lie within the region required for in vivo function. Together, these results support the two-domain model for hect E3 function and indicate that the WW domains play a role in the recognition of at least some of the substrates of Rsp5, including those related to its essential function. In addition, we show that haploid yeast strains bearing complete disruptions of either of two other hect E3 genes of yeast, designated HUL4 (YJR036C) and HUL5 (YGL141W), are viable.
G Wang; J Yang; J M Huibregtse
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Molecular and cellular biology     Volume:  19     ISSN:  0270-7306     ISO Abbreviation:  Mol. Cell. Biol.     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-02-10     Completed Date:  1999-02-10     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8109087     Medline TA:  Mol Cell Biol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  342-52     Citation Subset:  IM    
Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08855-1059, USA.
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MeSH Terms
Amino Acid Sequence
Binding Sites
Endosomal Sorting Complexes Required for Transport
Immunophilins / metabolism
Ligases / genetics*,  metabolism*
Molecular Sequence Data
Saccharomyces cerevisiae Proteins*
Structure-Activity Relationship
Substrate Specificity
Tacrolimus Binding Proteins
Ubiquitin-Protein Ligase Complexes*
Ubiquitin-Protein Ligases
Ubiquitins / metabolism
Grant Support
Reg. No./Substance:
0/Endosomal Sorting Complexes Required for Transport; 0/Saccharomyces cerevisiae Proteins; 0/Ubiquitins; EC 5.2.1.-/Tacrolimus Binding Proteins; EC; EC 6.-/Ligases; EC protein, S cerevisiae; EC Ligase Complexes; EC Ligases

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