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J. Biol. Chem., Vol. 266, Issue 23, 15549-15554, 08, 1991

Cloning and characterization of a Saccharomyces cerevisiae gene encoding a new member of the ubiquitin-conjugating protein family

S Qin, B Nakajima, M Nomura and SM Arfin
Department of Biological Chemistry, College of Medicine, University of California, Irvine 92717.

Ubiquitin-conjugating enzymes (E2s), which participate in the post- translational conjugation of ubiquitin to proteins, are encoded by a multigene family in the yeast Saccharomyces cerevisiae. E2s function in a variety of cellular activities including intracellular proteolysis, DNA repair, sporulation, and cell cycle traverse. Here, we report the cloning and characterization of a new member of the yeast UBC gene family, UBC8. UBC8 encodes a 206-amino acid protein containing a highly acidic carboxyl terminus. The primary structure of the protein is similar to that of all other known E2s, with the highest homology being to the E2 (23 kDa) of wheat germ. Haploid strains in which the UBC8 gene is disrupted are viable, and the disruption does not produce any obvious phenotype. The UBC8 protein, produced in Escherichia coli, forms thiol ester adducts with ubiquitin and, apparently, diubiquitin, but does not transfer ubiquitin to histones.
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