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J Biol Chem, Vol. 274, Issue 23, 16437-16443, June 4, 1999

Analysis of Functional Domains of the Host Cell Factor Involved in VP16 Complex Formation

From the Marie Curie Research Institute, The Chart, Oxted, Surrey, RH8 0TL, United Kingdom

We present biochemical analyses of the regions of the host cell factor (HCF) involved in VP16 complex formation and in the association between the N- and C-terminal domains of HCF itself. We show that the kelch repeat region of HCF (residues 1-380) is sufficient for VP16 complex formation, but that residues C-terminal to the repeats (positions 381-450) interfere with this activity. However, these latter residues are required for the interaction between the N- and C-terminal regions of HCF. The extreme C-terminal region of HCF, corresponding to an area of strong conservation with a Caenorhabditis elegans homologue, is sufficient for interaction with the N-terminal region. These results are discussed with respect to possible differences in the roles of HCF in VP16 activity versus its normal cellular function.

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