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Science 20 December 1991:
Vol. 254. no. 5039, pp. 1762 - 1767
DOI: 10.1126/science.1763325

Articles

Science, Vol 254, Issue 5039, 1762-1767
Copyright © 1991 by American Association for the Advancement of Science


articles

Characterization of a cofactor that regulates dimerization of a mammalian homeodomain protein

DB Mendel, PA Khavari, PB Conley, MK Graves, LP Hansen, A Admon, and GR Crabtree

Howard Hughes Medical Institute, Stanford University, CA 94305.

Dimerization among transcription factors has become a recurrent theme in the regulation of eukaryotic gene expression. Hepatocyte nuclear factor-1 alpha (HNF-1 alpha) is a homeodomain-containing protein that functions as a dimer. A dimerization cofactor of HNF-1 alpha (DCoH) was identified that displayed a restricted tissue distribution and did not bind to DNA, but, rather, selectively stabilized HNF-1 alpha dimers. The formation of a stable tetrameric DCoH-HNF-1 alpha complex, which required the dimerization domain of HNF-1 alpha, did not change the DNA binding characteristics of HNF-1 alpha, but enhanced its transcriptional activity. However, DCoH did not confer transcriptional activation to the GAL4 DNA binding domain. These results indicate that DCoH regulates formation of transcriptionally active tetrameric complexes and may contribute to the developmental specificity of the complex.


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Science. ISSN 0036-8075 (print), 1095-9203 (online)