國家衛生研究院 NHRI:Item 3990099045/2268

NHRI > Institute of Molecular and Genomic Medicine > Chi-Ying F. Huang(1998-2005) > Periodical Articles > Item 3990099045/2268

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Title:	PICK1, an anchoring protein that specifically targets protein kinase C alpha to mitochondria selectively upon serum stimulation in NIH 3T3 cells
Authors:	Wang, WL;Yeh, SF;Chang, YI;Hsiao, SF;Lian, WN;Lin, CH;Huang, CYF;Lin, WJ
Contributors:	Division of Molecular and Genomic Medicine
Abstract:	PICK1 binds to protein kinase Calpha (PKCalpha) through the carboxylate-binding loop in its PDZ (PSD95/Disc-large/ZO-1) domain and the C terminus of PKCalpha. We have previously shown that PICK1 modulates the catalytic activity of PKC selectively toward the antiproliferative gene TIS21. To investigate whether PICK1 plays a role in targeting activated PKCalpha to a particular intracellular compartment in addition to regulating PKC activity, we examine the localization of PICK1 and PKCalpha in response to various stimuli. Double staining with organelle markers and anti-rPICK1 antibodies reveals that PICK1 is associated with mitochondria but not with endoplasmic reticulum or Golgi in NIH 3T3 cells. Deletion of the PDZ domain impairs the mitochondria localization of PICK1, whereas mutations in the carboxylate-binding loop do not have an effect, suggesting that PICK1 can bind PKCalpha and mitochondria simultaneously. Upon serum stimulation, PICK1 translocates and displays a dense ring-like structure around the nucleus, where it still associates with mitochondria. A substantial portion of PKCalpha is concomitantly found in the condense perinuclear region. The C terminal-deleted PKCalpha fails to translocate and remains a diffuse cytoplasmic distribution, indicating that a direct interaction between PICK1 and PKCalpha is required for PKCalpha anchoring to mitochondria. 12-O-Tetradecanoylphorbol-13-acetate stimulation, in contrast, causes translocation of PKCalpha to the plasma membrane, whereas the majority of PICK1 remains in a cytoplasmic punctate pattern. Deletion at the C terminus of PKCalpha has no effect on 12-O-tetradecanoylphorbol-13-acetate-induced translocation. These findings indicate a previously unidentified role for PICK1 in anchoring PKCalpha to mitochondria in a ligand-specific manner.
Keywords:	Biochemistry & Molecular Biology
Date:	2003-09-26
Relation:	Journal of Biological Chemistry. 2003 Sep;278(39):37705-37712.
Link to:	http://dx.doi.org/10.1074/jbc.M304619200
JIF/Ranking 2023:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=1083-351X&DestApp=IC2JCR
Cited Times(WOS):	https://www.webofscience.com/wos/woscc/full-record/WOS:000185437200087
Cited Times(Scopus):	http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0141844501
Appears in Collections:	[Chi-Ying F. Huang(1998-2005)] Periodical Articles

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