Adenosine deaminase-complexing protein from bovine kidney. Isolation of two distinct subunits

M. I. Weisman, V. R. Caiolfa, A. H. Parola

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31 Scopus citations


We have isolated a complex of two proteins from bovine kidney that bind to adenosine deaminase immobilized on Sepharose 4B. One protein, with M(r) = 110,000, comigrates on both PAGE and SDS-PAGE gels with complexing protein isolated from rabbit kidney by the method of Schrader et al. (Schrader, W. P., Harder, C. M., and Schrader, D. K. (1983) Comp. Biochem. Physiol. B Comp. Biochem. 75, 119-126). The second protein has a M(r) = 70,000. Both proteins bind to the adenosine deaminase-Sepharose but not to a control resin of bovine serum albumin bound to Sepharose. Based on a comparison of partial and complete denaturation on SDS-PAGE the two proteins appear to be bound to each other. At adenosine concentrations of 0.5-1 mM the isolated complexing protein increases small subunit adenosine deminase catalytic activity by 20-30%. There may be some inhibition of catalytic activity at low adenosine concentrations. We have designated the 110,000 M(r) protein CP-I, the 70,000 M(r) protein CP-II and the complex of these two CP.

Original languageEnglish
Pages (from-to)5266-5270
Number of pages5
JournalJournal of Biological Chemistry
Issue number11
StatePublished - 1 Jan 1988

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology


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