Journal
MOLECULAR CELL
Volume 7, Issue 1, Pages 105-115Publisher
CELL PRESS
DOI: 10.1016/S1097-2765(01)00159-9
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The CIITA coactivator is essential for transcriptional activation of MHC class II genes and mediates enhanced MHC class I transcription. We now report that CIITA contains an intrinsic acetyltransferase (AT) activity that maps to a region within the N-terminal segment of CIITA, between amino acids 94 and 132. The AT activity is regulated by the C-terminal GTP-binding domain and is stimulated by GTP. CIITA-mediated transactivation depends on the AT activity. Further, we report that, although constitutive MHC class I transcription depends on TAF(II)50, CIITA activates the promoter in the absence of functional TAF(II)250.
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