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Using gel retardation and in vitro "footprinting", we have analyzed the interactions between nuclear proteins derived from various mouse cells and the enhancer and interferon response sequences of the H-2Kb gene. We have found that a protein factor binds a site in the enhancer sequence that partially overlaps the interferon response sequence. This factor also binds to a similar sequence lying in the opposite orientation in the promoter of the mouse beta 2-microglobulin gene, suggesting a common regulatory mechanism. Transfection competition experiments indicate that this factor acts as a positive element in the expression of H-2 and beta 2-microglobulin genes.

A common positive trans-acting factor binds to enhancer sequences in the promoters of mouse H-2 and beta 2-microglobulin genes.