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The regions of several genes (IFI-56K, HLA-A3, HLA-DR and 6-16) containing the (putative) ISRE (Interferon Stimulatable Response Element) were tested for their ability to be recognized by HeLa cells nuclear extract proteins. In a band shift assay, all probes yielded two B1 and B2 DNA-protein complexes of similar mobilities. Unexpectedly the titration of the B1 complex with a synthetic ISRE core (OL1), promoted the formation of B2. Both the probe and OL1 were recovered in B2. For each probe, the possibility of the part of the sequence involved in B1 complex to form a H-DNA structure with the part of the sequence involved in B2 exists. Such a structure was favored by the colinearity of the pairing regions and requires ATP. Although probes seemed to have a secondary structure, the formal existence of a H-DNA structure has not been demonstrated. Such a model could be extended to other interferon inducible gene promoters and may account for their binding properties and differential inducibility after 5' deletion or point mutations.

DNA protein interactions at the interferon-responsive promoter elements: potential for an H-DNA conformation