The yeast ubiquitin gene: head-to-tail repeats encoding a polyubiquitin precursor protein.

Abstract excerpt

Ubiquitin, a 76-residue protein, occurs in cells either free or covalently joined to a variety of protein species, from chromosomal histones to cytoplasmic proteins. Conjugation of ubiquitin to proteolytic substrates is essential for the selective degradation of intracellular proteins in higher eukaryotes. We show here that a protein homologous to human ubiquitin exists in the yeast Saccharomyces cerevisiae, and...

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