Document Detail

Duplication and familial promiscuity within the proteasome lid and COP9 signalosome kin complexes.
MedLine Citation:
PMID:  23415332     Owner:  NLM     Status:  Publisher    
Two paralogous complexes, the proteasome lid and the COP9 signalosome (CSN), have diverged from a common ancestor; yet fulfill distinctive roles within the ubiquitin-proteasome sphere. The CSN regulates the largest family of E3 ubiquitin ligases, called CRLs (Cullin-RING ubiquitin Ligases), while the lid is a subcomplex of the 26S proteasome, a proteolytic machinery responsible for the degradation of ubiquitinated proteins. Remarkably, in many organisms, several subunits of both complexes are duplicated, a circumstance that can hypothetically increase the number of different complexes that can be formed. Duplication, however, is not the only complexity trait within the lid and the CSN, because many of their subunits are not fully committed only to one of the two complexes, but they are able to associate with both. Indeed, their corresponding mutants have features that can be due to the absence of more than one complex. This could be simply explained by the subunits being able to carry an identical function within more than one paralogous complex or by the subunits having a certain level of promiscuity, i.e. being able to carry more than one function, depending on the complex they are associating with. Recent data show that both options are possible and, although their functional relevance still needs to be fully uncovered, evidence is accumulating, which indicates a promiscuous trading of paralogous subunits, and suggests that this may occur transiently, and/or in response to particular environmental conditions.
Giovanna Serino; Elah Pick
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-5
Journal Detail:
Title:  Plant science : an international journal of experimental plant biology     Volume:  203-204C     ISSN:  1873-2259     ISO Abbreviation:  Plant Sci.     Publication Date:  2013 Apr 
Date Detail:
Created Date:  2013-2-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882015     Medline TA:  Plant Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  89-97     Citation Subset:  -    
Copyright Information:
Copyright © 2013 Elsevier Ireland Ltd. All rights reserved.
Istituto Pasteur- Fondazione Cenci-Bolognetti, Department of Biology and Biotechnology, Sapienza Università di Roma, piazzale Aldo Moro 5, 00185 Rome, Italy. Electronic address:
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