What question did this study set out to answer?

To evaluate the inhibitory potency and specificity of the isoflavone genistein against tyrosine-specific protein kinases compared to serine- and threonine-specific kinases.

April 1, 1987Journal of Biological ChemistryOpen Access

Genistein, a specific inhibitor of tyrosine-specific protein kinases.

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To evaluate the inhibitory potency and specificity of the isoflavone genistein against tyrosine-specific protein kinases compared to serine- and threonine-specific kinases.
Measured in vitro kinase activity of the EGF receptor, pp60v-src, and pp110gag-fes alongside serine/threonine kinases (PKA, phosphorylase kinase, and PKC) in the presence of genistein.
Performed enzyme kinetic analyses with varying concentrations of ATP and the phosphate acceptor histone H2B.
Assayed EGF-stimulated receptor phosphorylation and conducted total phosphoamino acid analysis in cultured A431 cells.
Genistein inhibited tyrosine kinases (EGF receptor, pp60v-src, pp110gag-fes) via competitive inhibition toward ATP and noncompetitive inhibition toward histone H2B.
Genistein scarcely inhibited serine- and threonine-specific kinases, including cAMP-dependent protein kinase, phosphorylase kinase, and protein kinase C.
In cultured A431 cells, genistein suppressed EGF-stimulated serine, threonine, and tyrosine phosphorylation of the EGF receptor and reduced cellular phosphotyrosine levels.

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Implication

Experimental study demonstrates genistein selectively inhibits tyrosine-specific protein kinases in cultured A431 cells, suggesting its utility as a targeted molecular probe.

Cite This Study

Akiyama et al. (1987) studied this question.

synapsesocial.com/papers/6a10bf2c8102eb4b66ee4dd4 https://doi.org/10.1016/s0021-9258(18)45614-1

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Implication

Experimental study demonstrates genistein selectively inhibits tyrosine-specific protein kinases in cultured A431 cells, suggesting its utility as a targeted molecular probe.

Genistein, a specific inhibitor of tyrosine-specific protein kinases.

Key Points

Discussion

Implication

Cite This Study

Genistein, a specific inhibitor of tyrosine-specific protein kinases.

Key Points

Discussion

Implication

Cite This Study

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