Biochem/physiol Actions TBB is a highly selective, ATP/GTP-competitive inhibitor of casein kinase-2 (CK2) (IC50 = 900 nM and 1.6 mM, using rat liver and recombinant human CK2, respectively).
TBB is one of the most selective protein kinase inhibitors known, and when tested against a panel of 33 serine/threonine and tyrosine protein kinases, only three exhibited moderate inhibition by TBB, with Ki values one to two orders of magnitude higher th
