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- W2015208443 abstract "Three new spin-labeled glycosides, spin-label I [1-[4-(beta-D-galactopyranosyloxy)phenyl]-3-(2,2,6,6-tetramethyl-1 -oxypiperidin-4-yl)-2-thiourea], spin-label II (2,2,6,6-tetramethyl-1-oxypiperidin-4-yl alpha-D-galactopyranoside), and spin-label III [1-(methyl 2-deoxy-alpha-D-galactopyranosid-2-yl)-3-(2,2,6,6- tetramethyl-1-oxypiperidin-4-yl)-2-thiourea], were investigated as structural probes of Griffonia simplicifolia I isolectins (GS I) A4 and B4, respectively, by electron spin resonance (ESR) and inhibition of guaran isolectin precipitation. The p-aminophenyl beta-galactoside spin-label I was strongly immobilized by the B4 isolectin (Kd = 0.42 mM; 2T parallel = 54.0 +/- 0.3 G), while binding to the A4 isolectin was so weak (KI congruent to 2 mM) that binding was undetectable by ESR. The preference for the B4 isolectin was indicative of a more extended hydrophobic binding locus adjacent to the carbohydrate-specific binding site. The alpha-galactosyl spin-label II bound slightly more strongly to the A4 than to the B4 isolectin, as evidenced in both Kd values and particularly by differences in the degree of immobilization (2T parallel = 53.5 vs. 51.5 G, respectively). The 2-N-substituted methyl galactoside spin-label III was so poor an inhibitor of both isolectins (KI congruent to 1-2 mM) that ESR detection of the bound complex was not feasible. In all cases above, the spin-labels were displaced by specific monosaccharide haptens." @default.
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- W2015208443 title "[On ultraviolet fluorescence of guanine on paper chromatogram and in solution]." @default.
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