Specific adsorbents for affinity chromatography of benzodiazepine binding proteins

The use of affinity chromatography as means of isolating/purifying proteins which have an affinity for benzodiazepine is described. Three such drugs are employed: chlorazepate, clonazepam and delorazepam. The results presented in this paper indicate that the proposed technique only works for chlorazepate and delorazepam. In fact these benzodiazepine-Sepharose derivatives are able to retain specifically proteins from human serum and rat kidney, lung, skeletal muscle and brain.

Evidence of soluble proteins binding adriamycin by affinity chromatography

The presence of various tissues of soluble proteins binding adriamycin is evidenced by affinity chromatography.

Affinity labeling of histidine and lysine residue in the adenosine deaminase substrate binding site

1. Adenosine deaminase was inactivated by 9-(4-bromoacetamidobenzyl)-adenine (I) and 9-(2-bromoacetamidobenzyl)adenine (II), two affinity labels. 2. The stoichiometry of the reaction with reagent II is reported: 1 mol reagent is bound per mol inactive enzyme. Amino acid analysis of the 6 N HCl hydrolyzate of the inactive enzyme identified CM-histidine as the main alkylation product. This is the first evidence of the presence of a histidine in the active site region. 3. The alkylation rate and involved amino acid residues were studied for both reagents I and II, at pH 8 and 5.5. The particular reactivity of a lysine near or in the active site is discussed.

Effects of substituted 1,2,3-triazoles on adenosine deaminase, guanine deaminase and xanthine oxidase

The action of some known and new synthesized substituted 1,2,3-triazoles on adenosine deaminase, guanine deaminase and xanthine oxidase was studied. The effect of substituents in 1, 4 and 5 positions was studied and discussed. The presence of a carboxamido group in 4 position seems to be essential in the binding to adenosine deaminase.