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Pubmed ID :1460054
Publication Date : //

Human interferon consensus sequence binding protein is a negative regulator of enhancer elements common to interferon-inducible genes.


The promoter regions of many interferon-inducible genes share a short DNA sequence motif, termed the interferon consensus sequence (ICS) to which several regulatory proteins bind. A murine cDNA which encodes an ICS binding protein has been reported (M-ICSBP). The cloning of the human homologue of ICSBP (H-ICSBP) is described. H-ICSBP shares high sequence homology with its murine cognate. The derived sequence of H-ICSBP reveals restricted homology within the first 120 amino acids to three other interferon regulatory factors, IRF-1, IRF-2, and ISGF3 gamma. Truncated ICSBP lacking the first 33 amino-terminal amino acids fails to bind to the ICS, indicating that at least part of the DNA binding domain is located within the well conserved amino terminus. H-ICSBP is expressed exclusively in cell lines of hematopoietic origin. The results of transient transfection assays carried out either in hematopoietic or nonhematopoietic cells suggest that ICSBP acts as a negative regulatory factor on ICS-containing promoters. Furthermore, either interferon-gamma (IFN-gamma) or IFN-beta can alleviate the repression mediated by ICSBP. Therefore, ICSBP may be involved in maintaining submaximal transcriptional activity of IFN-inducible genes in hematopoietic cells. IFN treatment would then alleviate repression allowing maximal transcriptional activity of these genes.

Authors : Weisz A , Marx P , Sharf R , Appella E , Driggers P H , Ozato K , Levi B Z ,

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