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Related Experiment Videos

Chromogenic substrates for sulfurtransferases.

M R Burrous, J Westley

    Analytical Biochemistry
    |August 15, 1985
    PubMed
    Summary

    The azo dye 4-(dimethylamino)-4'-azobenzene (DAB) thiosulfonate anion acts as a sulfur donor for enzymes like rhodanese. This reaction produces DAB sulfinate, enabling new chromogenic assays for sulfur transfer reactions.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Chemical Biology

    Background:

    • The azo dye 4-(dimethylamino)-4'-azobenzene (DAB) thiosulfonate anion is a novel substrate.
    • Rhodanese (thiosulfate: cyanide sulfurtransferase, EC 2.8.1.1) and thiosulfate reductase are key enzymes in sulfur metabolism.

    Purpose of the Study:

    • To investigate the role of the DAB thiosulfonate anion as a sulfur-donor substrate.
    • To explore the potential of DAB sulfinate as a sulfur-acceptor substrate.
    • To develop new chromogenic assay procedures for sulfur transfer reactions.

    Main Methods:

    • Enzymatic assays using rhodanese and thiosulfate reductase.
    • Spectrophotometric analysis of light absorption at 500 nm to detect product formation.
    • Characterization of DAB sulfinate as a substrate.

    Main Results:

    • The DAB thiosulfonate anion successfully served as a sulfur donor for both rhodanese and thiosulfate reductase.
    • The reaction yielded DAB sulfinate, a product with distinct light absorption properties at 500 nm.
    • DAB sulfinate was also shown to function as a sulfur acceptor for rhodanese, enabling a second chromogenic assay.

    Conclusions:

    • The DAB thiosulfonate anion is a versatile substrate for sulfur transfer enzymes.
    • The formation of DAB sulfinate provides a basis for novel chromogenic assays.
    • These findings expand the toolkit for studying sulfur metabolism and enzyme kinetics.

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