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  • Title: The transcription factor Bright associates with Bruton's tyrosine kinase, the defective protein in immunodeficiency disease.
    Author: Webb CF, Yamashita Y, Ayers N, Evetts S, Paulin Y, Conley ME, Smith EA.
    Journal: J Immunol; 2000 Dec 15; 165(12):6956-65. PubMed ID: 11120822.
    Abstract:
    Binding of the transcription factor Bright to Ig heavy chain loci after B cell activation is associated with increased heavy chain transcription. We now report that Bright coprecipitates with Bruton's tyrosine kinase (Btk), the defective enzyme in X-linked immunodeficiency disease (xid). Furthermore, we observed Btk in the nucleus of activated murine B cells, and mobility shift assays suggest that it is a component of the Bright DNA-binding complex. While BRIGHT protein was synthesized in activated spleen cells from xid mice, it did not bind DNA or associate stably with Btk. These data suggest that deficiencies in BRIGHT DNA-binding activity may contribute to the defects in Ig production seen in xid mice.
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