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MBC in Press, published online ahead of print July 7, 2005
Mol. Biol. Cell 10.1091/mbc.E05-03-0251

A more recent version of this article appeared on September 1, 2005 Originally published as MBC in Press, 10.1091/mbc.E05-03-0251 on June 22, 2005
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Submitted on March 24, 2005
Revised on May 12, 2005
Accepted on June 9, 2005

Role of the Regulatory Domain of Protein Kinase D2 in Phorbol Ester Binding, Catalytic Activity, and Nucleocytoplasmic Shuttling

Alexandra Auer,*{dagger} Julia von Blume,*{dagger} Sabine Sturany,*{ddagger} Götz von Wichert,* Johan Van Lint,{sect} Jackie Vandenheede,{sect} Guido Adler,* and Thomas Seufferlein*

*Department of Internal Medicine l, Medical University of Ulm, Ulm 89081, Germany; {sect}Afdeling Biochemie, Katholieke Universiteit Leuven, 3000 Leuven, Belgium

Monitoring Editor: Vivek Malhotra

Protein kinase D2 (PKD2) belongs to the PKD family of serine/threonine kinases that is activated by phorbol esters and G protein coupled receptors (GPCRs). Its C-terminal regulatory domain comprises two cysteine-rich domains (C1a/C1b) followed by a pleckstrin homology (PH) domain. Here we examined the role of the regulatory domain in PKD2 phorbol ester binding, catalytic activity and subcellular localization: The PH domain is a negative regulator of kinase activity. C1a/C1b, in particular C1b, is required for phorbol ester binding and gastrin-stimulated PKD2 activation, but has no inhibitory effect on the catalytic activity. Gastrin triggers nuclear accumulation of PKD2 in living AGS-B cancer cells. C1a/C1b, not the PH domain, plays a complex role in the regulation of nucleocytoplasmic shuttling: We identified a nuclear localization sequence in the linker region between C1a and C1b and a nuclear export signal in the C1a domain. In conclusion, our results define the critical components of the PKD2 regulatory domain controlling phorbol ester binding, catalytic activity and nucleocytoplasmic shuttling and reveal marked differences to the regulatory properties of this domain in PKD1. This findings could explain functional differences between PKD isoforms and point to a functional role of PKD2 in the nucleus upon activation by GPCRs.

{dagger}These authors contributed equally to this work.

{ddagger}Present address: NMI, 72770 Reutlingen, Germany.

Address correspondence to: Thomas Seufferlein (thomas.seufferlein{at}medizin.uni-ulm.de)




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