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Mol. Cell. Biol., May 1997, 2391-2400, Vol 17, No. 5
Copyright © 1997, American Society for Microbiology

POU domain factors of the Brn-3 class recognize functional DNA elements which are distinctive, symmetrical, and highly conserved in evolution

CA Gruber, JM Rhee, A Gleiberman and EE Turner
Department of Psychiatry, University of California, San Diego, La Jolla, USA.

To better understand the diversity of function within the POU domain class of transcriptional regulators, we have determined the optimal DNA recognition site of several proteins of the POU-IV (Brn-3) subclass by random oligonucleotide selection. The consensus recognition element derived in this study, ATAATTAAT, is clearly distinct from octamer sites described for the POU factor Oct-1. The optimal POU-IV site determined here also binds Brn-3.0 with significantly higher affinity than consensus recognition sites previously proposed for this POU subclass. The binding affinity of Brn-3.0 on its optimal site, several variants of this site, and several naturally occurring POU recognition elements is highly correlated with the activation of reporter gene expression by Brn-3.0 in transfection assays. The preferred DNA recognition site of Brn-3.0 resembles strongly the optimal sites of another mammalian POU-IV class protein, Brn-3.2, and of the Caenorhabditis elegans Brn-3.0 homolog Unc-86, demonstrating that the site-specific DNA recognition properties of these factors are highly conserved between widely divergent species.

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