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  • Transcriptional coactivator, CIITA, is an acetyltransferase that bypasses a promoter requirement for TAF(II)250.

Transcriptional coactivator, CIITA, is an acetyltransferase that bypasses a promoter requirement for TAF(II)250.

Molecular cell (2001-02-15)
A Raval, T K Howcroft, J D Weissman, S Kirshner, X S Zhu, K Yokoyama, J Ting, D S Singer
ABSTRACT

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)250, CIITA activates the promoter in the absence of functional TAF(II)250.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Anti-CIITA antibody produced in rabbit, affinity isolated antibody