Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

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Trapasso, F. et al.

Designed FHIT alleles establish that Fhit-induced apoptosis in cancer cells is limited by substrate binding.

The FHIT gene is inactivated early in the development of many human tumors, and Fhit-deficient mice have increased cancer incidence. Viral reexpression of Fhit kills Fhit-deficient cells by induction of apoptosis. Fhit, a member of branch 2 of the histidine-triad superfamily of nucleoside monophosphate hydrolases and transferases, is a diadenosine polyphosphate hydrolase, the active-site histidine of which is not required for tumor suppression. To provide a rigorous test of the hypothesis that Fhit function depends on forming a complex with substrates, we designed a series of alleles of Fhit intended to reduce substrate-binding andor hydrolytic rates, characterized these mutants biochemically, and then performed quantitative cell-death assays on cancer cells virally infected with each allele. The allele series covered defects as great as 100,000-fold in k(cat) and increases as large as 30-fold in K(M). Nonetheless, when mutant FHIT genes were expressed in two human cancer cell lines containing FHIT deletions, reductions in apoptotic activity correlated exclusively with K(M). Mutants with 2- and 7-fold increases in K(M) significantly reduced apoptotic indices, whereas the mutant with a 30-fold increase in K(M) retained little cellular function. These data indicate that the proapoptotic function of Fhit is limited by substrate binding and is unrelated to substrate hydrolysis.[1]

References

Designed FHIT alleles establish that Fhit-induced apoptosis in cancer cells is limited by substrate binding. Trapasso, F., Krakowiak, A., Cesari, R., Arkles, J., Yendamuri, S., Ishii, H., Vecchione, A., Kuroki, T., Bieganowski, P., Pace, H.C., Huebner, K., Croce, C.M., Brenner, C. Proc. Natl. Acad. Sci. U.S.A. (2003) [Pubmed]

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