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  • Title: Occurrence of a putative SCF ubiquitin ligase complex in Drosophila.
    Author: Bocca SN, Muzzopappa M, Silberstein S, Wappner P.
    Journal: Biochem Biophys Res Commun; 2001 Aug 17; 286(2):357-64. PubMed ID: 11500045.
    Abstract:
    Many proteins are targeted to proteasome degradation by a family of E3 ubiquitin ligases, termed SCF complexes, that link substrate proteins to an E2 ubiquitin-conjugating enzyme. SCFs are composed of three core proteins-Skp1, Cdc53/Cull, Rbx1/Hrt1-and a substrate specific F-box protein. We have identified in Drosophila melanogaster the closest homologues to the human components of the SCF(betaTrCP) complex and the E2 ubiquitin-conjugating enzyme UbcH5. We show that putative Drosophila SCF core subunits dSkpA and dRbx1 both interact directly with dCu11 and the F-box protein Slmb. We also describe the direct interaction of the UbcH5 related protein UbcD1 with dCul1 and Slmb. In addition, a functional complementation test performed on a Saccharomyces cerevisiae Hrt1p-deficient mutant showed that Drosophila Rbx1 is able to restore the yeast cells viability. Our results suggest that dRbx1, dSkpA, dCullin1, and Slimb proteins are components of a Drosophila SCF complex that functions in combination with the ubiquitin conjugating enzyme UbcD1.
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