Science 1997 Sep 12;2775332:1672-6.

Proteolysis and DNA replication: the CDC34 requirement in the Xenopus egg cell cycle.

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The cell division cycle gene, CDC34, is required for ubiquitin-mediated degradation of G1 regulators and cell cycle progression through the transition from G1 to S phase in budding yeast. A CDC34 requirement for S phase onset in higher eukaryotes has not been established. Studies of the simple embryonic cell cycle of Xenopus laevis eggs demonstrated that Cdc34p in a large molecular size complex was required in the initiation of DNA replication. Cdc34p appears to regulate the initiation function of Cdk2-cyclin E, perhaps through the degradation of the Xenopus cdk inhibitor, Xic1.

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Species referenced: Xenopus laevis
Genes referenced: cdc34 cdk2 cdknx