title: Protein kinase D isozymes activation and localization during mitosis.
abstract: The protein kinase D (PKD) family consists of three serine/threonine protein kinases involved in the regulation of fundamental biological processes in response to their activation and intracellular redistribution. Although a substantial amount of information is available describing the mechanisms regulating the activation and intracellular distribution of the PKD isozymes during interphase, nothing is known of their activation status, localization and role during mitosis. The results presented in this study indicate that during mitosis, PKD3 and PKD are phosphorylated at Ser(731) and Ser(744) within their activation loop by a mechanism that requires protein kinase C. Mitosis-associated PKD3 Ser(731) and PKD Ser(744) phosphorylation is related to the catalytic activation of these kinases as evidenced by in vivo phosphorylation of histone deacetylase 5, a substrate of PKD and PKD3. Activation loop-phosphorylated PKD3 and PKD, as well as PKD2, associate with centrosomes, spindles and midbody suggesting that these activated kinases establish dynamic interactions with the mitotic apparatus. Thus, this study reveals a connection between the PKD isozymes and cell division, suggesting a novel role for this family of serine/threonine kinases.
authors.affiliation: Unit of Signal Transduction and Gastrointestinal Cancer, Division of Digestive Diseases, Department of Medicine, David Geffen School of Medicine, University of California at Los Angeles, 90095-1786, USA.
authors.forename: Romeo
authors.initials: R
authors.lastname: Papazyan
authors.forename: Michael
authors.initials: M
authors.lastname: Doche
authors.forename: Richard T
authors.initials: RT
authors.lastname: Waldron
authors.forename: Enrique
authors.initials: E
authors.lastname: Rozengurt
authors.forename: Mary Pat
authors.initials: MP
authors.lastname: Moyer
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Rey
mesh_terms: D000818:Animals; D002460:Cell Line; D004789:Enzyme Activation; D004791:Enzyme Inhibitors / Q000378:metabolism; D006801:Humans; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D008938:Mitosis / Q000502:physiology*; D010766:Phosphorylation; D011493:Protein Kinase C / Q000235:genetics / Q000378:metabolism*; D051381:Rats; D012694:Serine / Q000378:metabolism; D008941:Spindle Apparatus / Q000378:metabolism
chemical_list: D004791:Enzyme Inhibitors; D007527:Isoenzymes; D012694:Serine; C089212:protein kinase D; D011493:Protein Kinase C