Nucleic Acids Research, Vol 27, Issue 5 1359-1364, Copyright © 1999 by Oxford University Press
S Mertin, SG McDowall and VR Harley
SOX (SRY-related HMG box) proteins are transcription factors that have
critical roles in the regulation of numerous developmental processes. They
share at least 50% homology in their HMG domains, which bind the DNA
element AACAAT. How different SOX proteins achieve specific regulation of
target genes is not known. We determined the DNA-binding specificity of
SOX9 using a random oligonucleotide selection assay. The optimal SOX9
binding sequence, AGAACAATGG, contained a core DNA-binding element AACAAT,
flanked by 5' AG and 3' GG nucleotides. The specific interaction between
SOX9 and AGAACAATGG was confirmed by mobility shift assays, DNA competition
and dissociation studies. The 5' AG and 3' GG flanking nucleotides enhance
binding by SOX9 HMG domain, but not by the HMG domain of another SOX
factor, SRY. For SRY, different 5' and 3' flanking nucleotides are
preferred. Our studies support the notion that SOX proteins achieve DNA
sequence specificity through subtle preferences for flanking nucleotides
and that this is likely to be dictated by signature amino acids in their
HMG domains. Furthermore, the related HMG domains of SOX9 and Sox17 have
similar optimal binding sites that differ from those of SRY and Sox5,
suggesting that SOX factors may co-evolve with their DNA targets to achieve
specificity.
ARTICLES
The DNA-binding specificity of SOX9 and other SOX proteins
The Howard Florey Institute of Experimental Physiology and Medicine, University of Melbourne, Parkville, Victoria 3052, Australia.
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