We have incorporated the DNA-cleaving moiety o-phenanthroline-copper at amino acid 10 of the Msx-1 homeodomain, and we have analyzed site-specific DNA cleavage by the resulting Msx-1 derivative. We show that amino acid 10 of the Msx-1 homeodomain is close to the 5' end of the consensus DNA site 5'- (C/G)TAATTG-3' in the Msx-1-DNA complex. Our results indicate that the orientation of the Msx-1 homeodomain relative to DNA is analogous to the orientation of the engrailed and Antennapedia homeodomains. We show further that DNA affinity cleaving permits identification of consensus DNA sites for Msx-1 in kilobase DNA substrates. The specificity of the approach enabled us to identify an Msx-1 consensus DNA site within the transcriptional control region of the developmental regulatory gene Wnt-1. We propose that incorporation of o-phenanthroline-copper at amino acid 10 of a homeodomain may provide a generalizable strategy to determine the orientation of a homeodomain relative to DNA and to identify homeodomain consensus DNA sites in genomic DNA.
|Original language||English (US)|
|Number of pages||5|
|Journal||Proceedings of the National Academy of Sciences of the United States of America|
|State||Published - Jan 4 1994|
All Science Journal Classification (ASJC) codes
- cysteine-specific chemical modification of protein