Cheng, Ming published the artcileSulfo-SADP (sulfosuccinimidyl[4-azidophenyldithio]propionate) an active site directed reagent inhibiting the NADPH dependent O2– generation of leukocyte cytochrome b558, COA of Formula: C18H20N2O12, the publication is Journal of Biochemistry, Molecular Biology and Biophysics (2002), 6(3), 177-184, database is CAplus and MEDLINE.
Functional reagents known to bring about the formation of a distinct membrane mol. complex of the subunits of cytochrome b558 (gp 91phox and p22phox) were investigated for their influence on the O2– generating capability of liposome incorporated cytochrome b558 preparations One, ethyleneglycolbis[sulfo-succinimidylsuccinate], (sulfo-EGS) was found to inhibit O2– generation at concentrations which are known to result in crosslinking the two subunits of cytochrome b558. Sulfosuccinimidyl [4-azidophenyldithio]propionate, (sulfo-SADP) on the other hand, was found to be a powerful inhibitor of the cytochrome b558 dependent O2– production at concentrations not able to result in cross linking of the two subunits. Sulfo-SADP inhibits the cytochrome b558 O2– production 50% at 25 μM, while sulfo-EGS requires 400 μM. For these reagents, the succinimidyl group of sulfo-SADP and sulfo-EGS is the reactive group, which inhibit irreversibly, cytochrome b558 generation of O2–. Both sulfo-SADP and sulfo-EGS have similar linker arms of 13.9 and 16.1 Å, resp. The difference, accounting for the strong inhibitory profile for sulfo-SADP as compared with sulfo-EGS, resides in the aryl group associated with the sulfo-SADP. The aryl group of sulfo-SADP has been found to be important in directing the specificity of the probe in its inhibition of O2– generation. When the disulfide bond linking the aromatic portion of the probe to the succinimidyl ring is cleaved by DTT (dithiothreitol), the product loses its specificity and has an inhibitory activity with respect to O2– generation comparable to that of sulfo-EGS. The partial protection against the inhibitory influence of sulfo-SADP by NADP+ indicates that the reagent may interact at the pyridine nucleotide-binding domain of cytochrome b558. Its low inhibitory titer and its water solubility suggest that sulfo-SADP reacts with a specific amine (the primary reactant for the succinimidyl group) on cytochrome b558.
Journal of Biochemistry, Molecular Biology and Biophysics published new progress about 70539-42-3. 70539-42-3 belongs to alcohols-buliding-blocks, auxiliary class pyrrolidine,Ester,Amide,Inhibitor,Inhibitor, name is Bis(2,5-dioxopyrrolidin-1-yl) O,O’-ethane-1,2-diyl disuccinate, and the molecular formula is C18H20N2O12, COA of Formula: C18H20N2O12.
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