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The FASEB Journal, Vol 11, 1257-1268, Copyright © 1997 by The Federation of American Societies for Experimental Biology

REVIEWS

Pathways of ubiquitin conjugation

AL Haas and TJ Siepmann
Department of Biochemistry, Medical College of Wisconsin, Milwaukee 53226, USA.

The covalent attachment of the polypeptide ubiquitin to proteins marks them for degradation by the ubiquitin/26S proteasome-dependent degradation pathway. This pathway functions in regulating many fundamental processes required for cell viability. Phylogenetic analysis of ubiquitin sequences reveals greater variability among lower eukaryotes and defines essential residues, many of which are conserved among the three ubiquitin-like proteins known to undergo parallel ligation pathways. The hierarchical design of the ubiquitin conjugation mechanism provides great flexibility for the divergent evolution of new functions mediated by this posttranslational modification. Within this hierarchy, a single ubiquitin-activating enzyme provides charged intermediates to multiple targeting pathways defined by cognate ubiquitin carrier protein (E2)/ligase (E3) pairs. Sequence analysis of E2 isozymes shows that the E2 superfamily is composed of distinct function-specific families. The apparent lack of E2/E3 specificity suggested in the literature results from the presence of multiple isozymes within many E2 families and erroneous family assignments based on incomplete data sets. Other apparent inconsistencies are explained by interfamily sequence relationships among some E2 isoforms.


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