Document Detail

Cytoplasmic and plasma membrane adenosine triphosphatase of polymorphonuclear neutrophils: comparison of their enzymatic properties and attempt for a direct determination of myosin ATPase activity using polymorphonuclear neutrophil extract.
MedLine Citation:
PMID:  6446937     Owner:  NLM     Status:  MEDLINE    
Enzymatic properties of the ATPase of the plasma membrane and cytoplasmic myosin B from guinea-pig polymorphonuclear neutrophils were compared. In the plasma membrane, Mg2+- and Ca2+-activated ATPases showed the same dependence pattern on KCl concentration and pH, i.e., both ATPases increased with decreasing KCl concentration and with rising pH until pH 9.0. The maximum activation of Mg2+-ATPase was observed at 1 . 10(-3) M Mg2+. On the other hand, EDTA-activated ATPase activity was so low that no clear dependence curve was obtained. In myosin B, Mg2+-ATPase activity was below one-tenth that of the plasma membrane ATPase with the maximum activation at 1 . 10(-2) M Mg2+ and pH 9.0 EDTA- and Ca2+-activated ATPase exhibited almost the same activity and the same KCl-dependence curve, i.e., both ATPases increased and increasing KCl concentration. With regard to pH-dependence, Ca2+-ATPase showed a U-shaped curve with the minimum at pH 7.0, wherease EDTA-activated ATPase indicated a bell-shaped curve with the maximum at pH 9.0. Based on the findings that the EDTA-activated ATPase activity was hardly detected in the plasma membrane but high in myosin B, the distribution of ATPase activity on subcellular fractions was studied and the results obtained that the myosin-ATPase activity could be directly measured using the polymorphonuclear neutrophil extract if the EDTA-activated ATPase activity was used as an enzymatic marker for myosin.
T Yamashita; Y Tanaka; H Matsuzawa
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biochimica et biophysica acta     Volume:  599     ISSN:  0006-3002     ISO Abbreviation:  Biochim. Biophys. Acta     Publication Date:  1980 Jun 
Date Detail:
Created Date:  1980-10-24     Completed Date:  1980-10-24     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0217513     Medline TA:  Biochim Biophys Acta     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  246-53     Citation Subset:  IM    
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MeSH Terms
Adenosine Triphosphatases / metabolism*
Cell Membrane / enzymology*
Cell-Free System
Cytoplasm / enzymology*
Guinea Pigs
Neutrophils / enzymology*
Reg. No./Substance:
EC 3.6.1.-/Adenosine Triphosphatases; EC

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

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