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Mol. Cell. Biol., 04 1995, 2090-2100, Vol 15, No. 4
Copyright © 1995, American Society for Microbiology

Mechanisms for flexibility in DNA sequence recognition and VP16-induced complex formation by the Oct-1 POU domain

MA Cleary and W Herr
Cold Spring Harbor Laboratory, New York 11724.

DNA binding by the Oct-1 protein is directed by its POU domain, a bipartite DNA-binding domain made up of a POU-specific (POUS) domain and a POU-homeo (POUH) domain, two helix-turn-helix-containing DNA- binding modules that cooperate in DNA recognition. Although the best- characterized DNA target for Oct-1 binding is the octamer sequence ATGCAAAT, Oct-1 also binds a number of different DNA sequence elements. For example, Oct-1 recognizes a form of the herpes simplex virus VP16- responsive TAATGARAT element, called the (OCTA-)TAATGARAT site, that lacks octamer site similarity. Our studies suggest two mechanisms by which Oct-1 achieves flexible DNA sequence recognition. First, an important arginine found in the Oct-1 POUS domain tolerates substitutions of its base contacts within the octamer site. Second, on the (OCTA-)TAATGARAT site, the POUS domain is located on the side of the POUH domain opposite from where it is located on an octamer site. This flexibility of the Oct-1 POU domain in DNA binding also has an impact on its participation in a multiprotein-DNA complex with VP16. We show that Oct-1 POUS domain residues that contact DNA have different effects on VP16-induced complex formation depending on whether the VP16- responsive element involved has overlapping octamer similarity or not.


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