Abstract
The human serine/threonine kinase Aurora-B is structurally related to the protein kinase Ipl1p from S cerevisiae and aurora from Drosophila melanogaster, which are key regulators of mitosis. The present study shows that human Aurora-B is activated by okadaic acid and forms complexes with the protein serine/threonine phosphatase type 1 (PP1) or PP2A, but not with PP5. These data identified Aurora-B associated protein phosphatases as negative regulators of kinase activation. We then used a series of substrates based on a histone H3 phosphorylation site (residues 5-15) to determine the substrate specificity of human Aurora-B. We found that this enzyme is an arginine-directed kinase that can phosphorylate histone H3 at serines 10 and 28 in vitro, suggesting that human Aurora-B is a mitotic histone H3 kinase.
Original language | English |
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Pages (from-to) | 3103-3111 |
Number of pages | 9 |
Journal | Oncogene |
Volume | 21 |
Issue number | 20 |
DOIs | |
Publication status | Published - 09-05-2002 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Molecular Biology
- Genetics
- Cancer Research