Document Detail


Photoaffinity labeling of three renal cyclic 3',5'-adenosine monophosphate-binding proteins.
MedLine Citation:
PMID:  228750     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Evidence is presented for the presence of multiple cyclic AMP binding components in the plasma membrane and cytosol fractions of porcine renal cortex and medulla. N6-(Ethyl-2-diazomalonyl)-3',5'-adenosine monophosphate, a photoaffinity label for cyclic AMP binding sites, exhibits non-covalent binding characteristics similar to cyclic AMP in membrane and soluble fractions. Binding data for either compound to the plasma membrane fraction yields biphasic Scatchard plots while triphasic plots are obtained with the dialyzed cytosol. When covalently labeled fractions are separated on SDS-polyacrylamide gel electrophoresis, the cyclic AMP photoaffinity label is found on 49 000 and 130 000 dalton components in each kidney fraction. DEAE-cellulose and gel filtration chromatography of the labeled cortical cytosol fraction establishes that the three components suggested by the binding data correspond to two 49 000 dalton species and a 130 000 component. The 49 000 species have higher affinities for cyclic AMP than the 130 000 component (Ka(1) = 2.0 . 10(9), Ka(2) = 1.7 . 10(8), Ka(3) = 1.0 . 10(7)). The 49 000 components are associated with protein kinase activity while the 130 000 component does not exhibit protein kinase, adenosine deaminase, or cyclic nucleotide phosphodiesterase activity. Immunologic results and effects of phosphorylation and cyclic GMP on cyclic AMP binding further suggest that the 49 000 components are regulatory subunits of cyclic AMP-dependent protein kinases. Cyclic AMP binding to the 130 000 component is markedly inhibited by adenosine and adenine nucleotides, but not cyclic GMP. Thus, this component may reflect an aspect of adenosine control or metabolism which may or may not be a cyclic AMP-related cellular function.
Authors:
J A Near; F C Szoka; R Olsen; M J Ettinger
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  587     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1979 Nov 
Date Detail:
Created Date:  1980-02-15     Completed Date:  1980-02-15     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  522-39     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Binding Sites
Cell Membrane / metabolism
Chromatography, DEAE-Cellulose
Chromatography, Gel
Cyclic AMP / analogs & derivatives*,  metabolism
Cytosol / metabolism
Diazonium Compounds / metabolism
Kidney / metabolism*
Light
Molecular Weight
Protein Kinases / metabolism
Swine
Chemical
Reg. No./Substance:
0/Diazonium Compounds; 60-92-4/Cyclic AMP; EC 2.7.-/Protein Kinases

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


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