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Science 3 September 1993: Vol. 261. no. 5126, pp. 1324 - 1328 DOI: 10.1126/science.8103239
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Articles
Science, Vol 261, Issue 5126, 1324-1328
Copyright © 1993 by American Association for the Advancement of Science
Cooperative interactions between the Caenorhabditis elegans homeoproteins UNC-86 and MEC-3
D Xue,
Y Tu,
and
M Chalfie
Department of Biological Sciences, Columbia University, New York, NY 10027.
The POU-type homeodomain protein UNC-86 and the LIM-type homeodomain protein MEC-3, which specify neuronal cell fate in the nematode Caenorhabditis elegans, bind cooperatively as a heterodimer to the mec-3 promoter. Heterodimer formation increases DNA binding stability and, therefore, increases DNA binding specificity. The in vivo significance of this heterodimer formation in neuronal differentiation is suggested by (i) a loss-of-function mec-3 mutation whose product in vitro binds DNA well but forms heterodimers with UNC-86 poorly and (ii) a mec-3 mutation with wild-type function whose product binds DNA poorly but forms heterodimers well.
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