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Pubmed ID :11268217
Publication Date : //

Regulation of CD40 and CD40 ligand by the AT-hook transcription factor AKNA.


Proteins containing AT hooks bind A/T-rich DNA through a nine-amino-acid motif and are thought to co-regulate transcription by modifying the architecture of DNA, thereby enhancing the accessibility of promoters to transcription factors. Here we describe AKNA, a human AT-hook protein that directly binds the A/T-rich regulatory elements of the promoters of CD40 and CD40 ligand (CD40L) and coordinately regulates their expression. Consistent with its function, AKNA is a nuclear protein that contains multiple PEST protein-cleavage motifs, which are common in regulatory proteins with high turnover rates. AKNA is mainly expressed by B and T lymphocytes, natural killer cells and dendritic cells. During B-lymphocyte differentiation, AKNA is mainly expressed by germinal centre B lymphocytes, a stage in which receptor and ligand interactions are crucial for B-lymphocyte maturation. Our findings show that an AT-hook molecule can coordinately regulate the expression of a key receptor and its ligand, and point towards a molecular mechanism that explains homotypic cell interactions.

Authors : Siddiqa A , Sims-Mourtada J C , Guzman-Rojas L , Rangel R , Guret C , Madrid-Marina V , Sun Y , Martinez-Valdez H ,

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