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Mol. Cell. Biol., 02 1997, 571-583, Vol 17, No. 2
F Liu, JJ Stanton, Z Wu and H Piwnica-Worms
Entry into mitosis requires the activity of the Cdc2 kinase. Cdc2
associates with the B-type cyclins, and the Cdc2-cyclin B heterodimer is in
turn regulated by phosphorylation. Phosphorylation of threonine 161 is
required for the Cdc2-cyclin B complex to be catalytically active, whereas
phosphorylation of threonine 14 and tyrosine 15 is inhibitory. Human
kinases that catalyze the phosphorylation of threonine 161 and tyrosine 15
have been identified. Here we report the isolation of a novel human cDNA
encoding a dual-specificity protein kinase (designated Myt1Hu) that
preferentially phosphorylates Cdc2 on threonine 14 in a cyclin-dependent
manner. Myt1Hu is 46% identical to Myt1Xe, a kinase recently characterized
from Xenopus laevis. Myt1Hu localizes to the endoplasmic reticulum and
Golgi complex in HeLa cells. A stretch of hydrophobic and uncharged amino
acids located outside the catalytic domain of Myt1Hu is the likely
membrane-targeting domain, as its deletion results in the localization of
Myt1Hu primarily to the nucleus.
Copyright © 1997, American Society for Microbiology
The human Myt1 kinase preferentially phosphorylates Cdc2 on threonine 14 and localizes to the endoplasmic reticulum and Golgi complex
Department of Cell Biology and Physiology, Washington University Medical School, St. Louis, Missouri 63110-1093, USA.
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