Document Detail


Calcium-activated, phospholipid-dependent protein kinase in pancreatic acinar cells.
MedLine Citation:
PMID:  3159267     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In the present study we partially purified calcium-activated, phospholipid-dependent protein kinase (protein kinase C) from pancreatic acinar cells of the guinea pig using diethylaminoethylcellulose and Sephadex G-150 chromatography and characterized the dependence of the enzyme on calcium, phospholipids, diacylglycerol (diolein), and the phorbol ester 12-O-tetradecanoylphorbol 13-acetate (TPA). The enriched preparation of protein kinase C contained no cyclic nucleotide-dependent or calcium-dependent, calmodulin-dependent protein kinase activity. The values of Km for H1-histone and ATP were 0.74 +/- 0.22 and 13.1 +/- 3.2 microM, respectively. Pancreatic protein kinase C demonstrated an absolute requirement for calcium and phospholipid for its activation, and diolein or TPA increased the affinity of the enzyme for calcium by 10-fold. With phosphatidylserine the calcium concentration that caused a half-maximal activation (Ka) was 74 +/- 17 microM, whereas with phosphatidylserine and diolein or TPA the Ka for calcium was 7.9 +/- 1.6 or 6.8 +/- 1.3 microM, respectively. Adding phosphatidylethanolamine and phosphatidylserine decreased the Ka for calcium to 2.0 +/- 0.9 microM with diolein and to 0.7 +/- 0.4 microM with TPA. Activation of protein kinase C by TPA and diolein was identical with calcium concentrations greater than 1 microM, but at low calcium concentrations (less than 1 microM) in the presence of phospholipids, maximally effective concentrations of diolein caused only 55% of the activation seen with TPA. In addition to TPA, other phorbol esters such as phorbol dibutyrate and phorbol diacetate, but not phorbol itself, activated protein kinase C.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
M Noguchi; H Adachi; J D Gardner; R T Jensen
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  248     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1985 Jun 
Date Detail:
Created Date:  1985-07-24     Completed Date:  1985-07-24     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  G692-701     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Calcium / metabolism
Chromatography, DEAE-Cellulose
Chromatography, Gel
Diglycerides / metabolism
Enzyme Activation / drug effects
Guinea Pigs
Islets of Langerhans / enzymology*
Male
Phorbol Esters / pharmacology
Phospholipids / metabolism
Protein Kinase C
Protein Kinases / isolation & purification,  metabolism*
Stimulation, Chemical
Chemical
Reg. No./Substance:
0/Diglycerides; 0/Phorbol Esters; 0/Phospholipids; 7440-70-2/Calcium; EC 2.7.-/Protein Kinases; EC 2.7.11.13/Protein Kinase C

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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