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Mammalian Growth-associated H1 Histone Kinase: a Homolog of Cdc2+/CDC28 Protein Kinases Controlling Mitotic Entry in Yeast and Frog Cells

Overview
Journal Mol Cell Biol
Specialty Cell Biology
Date 1989 Sep 1
PMID 2550805
Citations 87
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Abstract

Mammalian growth-associated H1 histone kinase, an enzyme whose activity is sharply elevated at mitosis, is similar to cdc2+ protein kinase from Schizosaccharomyces pombe and CDC28 protein kinase from Saccharomyces cerevisiae with respect to immunoreactivity, molecular size, and specificity for phosphorylation sites in H1 histone. Phosphorylation of specific growth-associated sites in H1 histone is catalyzed by yeast cdc2+/CDC28 kinase, as shown by the in vitro thermal lability of this activity in extracts prepared from temperature-sensitive mutants. In addition, highly purified Xenopus maturation-promoting factor catalyzes phosphorylation of the same sites in H1 as do the mammalian and yeast kinases. The data indicate that growth-associated H1 kinase is encoded by a mammalian homolog of cdc2+/CDC28 protein kinase, which controls entry into mitosis in yeast and frog cells. Since H1 histone is known to be an in vivo substrate of the mammalian kinase, this suggests that phosphorylation of H1 histone or an H1 histone counterpart is an important component of the mechanism for entry of cells into mitosis.

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