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Research Papers
Department of Biology and Technology (DIBIT), Istituto Scientifico H.S. Raffaele, Milan, Italy.
Abstract
Transcription of human HOX gene promoters in cultured cells is positively and negatively regulated by HOX proteins interacting with specific target sequences. The human HOXD9 protein activates transcription of the HOXD9 promoter by interacting with the HCR sequence and is antagonized by the HOXD8 protein. HOXD8 is not intrinsically a repressor, since it can activate transcription on different targets. Complete or partial HOXD8/HOXD9 homeo domain swapping indicates that the ability to recognize, and activate transcription from, the HCR target in vivo depends on the amino terminus and helix 1 of the homeo domain. The inhibitory activity of HOXD8 is not affected by deletion of the homeo domain helix 2/3 region, whereas it requires the amino terminus/helix 1 region and an additional, effector domain located at the protein amino-terminal end. This activity is therefore DNA-binding independent, and possibly mediated by protein-protein interactions. Affinity chromatography experiments show that the homeo domain amino terminus/helix 1 region is able to mediate direct interactions between HOX proteins in solution. These data indicate that specificity of HOX protein function in vivo depends on both DNA-protein and protein-protein interactions, mediated by the same sub region of the homeo domain.
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