| Here we have identified and characterized BCL 3 binding protein ( B3BP ) as a protein interacting specifically with the bcl 3 gene product ( BCL 3 ) by a yeast two hybrid screen . 0.69882731^^^ The N terminal region of B3BP that contains the ATP binding site is important for the interaction with BCL 3 and p300 / CBP . 0.69701288^^^ We found that B3BP associates with not only BCL 3 but also p300 / CBP histone acetyltransferases . 0.53460114^^^ |