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- W1994259533 abstract "Patients with combined immunodeficiency (CID) and adenosine deaminase (ADA) deficiency may have low or absent ADA activity in various tissues. Hirschhorn et al. have shown that the activity in patient fibroblasts is a mutant form of ADA (PNAS 73: 213, 1976). Others have suggested that the deficiency reflects an inhibition of ADA (Trotta et al., PNAS 73: 104, 1976). We have isolated and in part characterized properties of the residual ADA from spleen of one patient. Radioimmunoassay for ADA protein in erythrocytes and spleen extracts of the patient showed no cross-reacting protein. Chromatography of ADA-CID spleen extracts produced a fraction with adenosine deaminating activity which could not be adsorbed on affinity or anti-ADA columns. The deaminating activity could not be inhibited with erythro-9-(2-hydroxyl-3-nonyl) adenosine. The pH optimum activity curve and Km differed from normal spleen ADA. A similar fraction, representing about 1% of the total ADA activity, was isolated from normal spleen extracts. We conclude that the adenosine deaminating activity observed in patients with ADA-CID is not ADA. The activity may be due to an enzyme whose principal substrate may be another metabolite. The presence of this non-ADA deaminating activity in normal spleen suggests that the observed activity in ADA-CID tissue is not due to a mutant form of ADA and that the inhibited enzyme activity reported by Trotta et al. may be due to an amplification of this non-ADA deaminating enzyme." @default.
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- W1994259533 date "1977-04-01" @default.
- W1994259533 modified "2023-10-18" @default.
- W1994259533 title "TISSUE ADENOSINE DEAMINASE ACTIVITY IN AN ADENOSINE DEFICIENT-COMBINED IMMUNODEFICIENCY DISEASE PATIENT" @default.
- W1994259533 doi "https://doi.org/10.1203/00006450-197704000-00732" @default.
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