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Mol. Cell. Biol., Dec 1996, 6634-6643, Vol 16, No. 12
N Mathias, SL Johnson, M Winey, AE Adams, L Goetsch, JR Pringle, B Byers and MG Goebl
Regulation of cell cycle progression occurs in part through the targeted
degradation of both activating and inhibitory subunits of the
cyclin-dependent kinases. During G1, CDC4, encoding a WD-40 repeat protein,
and CDC34, encoding a ubiquitin-conjugating enzyme, are involved in the
destruction of these regulators. Here we describe evidence indicating that
CDC53 also is involved in this process. Mutations in CDC53 cause a
phenotype indistinguishable from those of cdc4 and cdc34 mutations,
numerous genetic interactions are seen between these genes, and the encoded
proteins are found physically associated in vivo. Cdc53p defines a large
family of proteins found in yeasts, nematodes, and humans whose molecular
functions are uncharacterized. These results suggest a role for this family
of proteins in regulating cell cycle proliferation through protein
degradation.
Copyright © 1996, American Society for Microbiology
Cdc53p acts in concert with Cdc4p and Cdc34p to control the G1-to-S- phase transition and identifies a conserved family of proteins
Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis 46202-5122, USA.
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