Characterization of adenosine deaminase isozymes from normal human erythrocytes. - Suppr | 超能文献

Characterization of adenosine deaminase isozymes from normal human erythrocytes.

作者信息

Van Heukelom L H, Boom A, Bartstra H A, Staal G E

出版信息

Clin Chim Acta. 1976 Oct 1;72(1):109-15. doi: 10.1016/0009-8981(76)90041-3.

DOI:10.1016/0009-8981(76)90041-3

PMID:10102

Abstract

Adenosine deaminase of phenotype ADA was partially purified by chromatography on CM-Sephadex C-50 and ammonium sulphate precipitation. With DEAE-Sephadex A-50 three isozymes could be detected. a. The KM values for the substrate adenosine were found to be 30 muM for each isozyme. b. pH optimum was 7.0 and the molecular weight estimated by gel filtration was found to be 30 000 for each isozyme. c. The heat stability of RBC-ADA type 1-1 was greater than type 1-2. The isozyme in type 2-1 representing the electrophoretic band of phenotype ADA2-2 is the most labile. d. ATP, ADP, AMP and cyclic AMP, PCMB and 6-methylmercaptopurine riboside were found to be competitive inhibitors with ADA in all three isozymes.

摘要

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