Document Detail

Affinity chromatography of regulatory subunits of protein phosphatase-1.
MedLine Citation:
PMID:  8554347     Owner:  NLM     Status:  MEDLINE    
In this study we demonstrate that recombinant rabbit muscle protein phosphatase-1 immobilized on CH-Sepharose is an efficient affinity chromatography support for the isolation of subunits of phosphatase-1. The support was used to isolate the glycogen binding subunit of phosphatase-1 from muscle and nonmuscle rat tissues. Examination of the affinity-purified material from rat heart and liver showed that the major component was a 160-kDa polypeptide on SDS-PAGE. The identity of the purified liver 160-kDa polypeptide as the glycogen binding subunit was confirmed by the demonstration that it is capable of binding to glycogen, and is phosphorylated by the catalytic subunit of PKA. The novel observation was made that the phosphorylation was dependent on the presence of glycogen. Examination of the material from heart, lung, liver, kidney, and brain showed a similar phenomenon. Our studies show that this subunit is widely distributed in tissues. The affinity support was also efficient in the isolation of the NIPP-1 (nuclear inhibitor of protein phosphatase-1) proteins from calf thymus. Examination of heat-treated extracts of rat liver led to the isolation of a novel 19-kDa inhibitory protein which could also be phosphorylated by PKA and may represent the rat liver homolog of calf thymus NIPP-1.
S Zhao; W Xia; E Y Lee
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Archives of biochemistry and biophysics     Volume:  325     ISSN:  0003-9861     ISO Abbreviation:  Arch. Biochem. Biophys.     Publication Date:  1996 Jan 
Date Detail:
Created Date:  1996-02-16     Completed Date:  1996-02-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0372430     Medline TA:  Arch Biochem Biophys     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  82-90     Citation Subset:  IM    
Department of Biochemistry and Molecular Biology, University of Miami School of Medicine, Florida 33101, USA.
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MeSH Terms
Carrier Proteins*
Chromatography, Affinity / methods*
Cyclic AMP-Dependent Protein Kinases / metabolism
Electrophoresis, Polyacrylamide Gel
Enzyme Inhibitors / isolation & purification
Enzymes, Immobilized
Glycogen / metabolism
Intracellular Signaling Peptides and Proteins*
Liver / chemistry,  enzymology
Muscle, Skeletal / enzymology
Myocardium / enzymology
Organ Specificity
Phosphoprotein Phosphatases / antagonists & inhibitors,  isolation & purification*,  metabolism
Protein Phosphatase 1
Proteins / isolation & purification
Thymus Gland / chemistry
Grant Support
Reg. No./Substance:
0/Carrier Proteins; 0/Enzyme Inhibitors; 0/Enzymes, Immobilized; 0/Intracellular Signaling Peptides and Proteins; 0/Proteins; 0/protein phosphatase inhibitor-1; 9005-79-2/Glycogen; EC AMP-Dependent Protein Kinases; EC Phosphatases; EC Phosphatase 1

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

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