Patent ID: 7771940

Claim:
A method for detecting a plurality of sequence specific DNA binding proteins, comprising: (a) contacting a plurality of detection duplexes, wherein each of said, detection duplexes comprises (i) a first oligonucleotide comprising a distinguishable capture tag, wherein said capture tag is a nucleic acid sequence of natural nucleotides linked by natural linkages between nucleotides, and (ii) a second oligonucleotide that is complementary to said first oligonucleotide, wherein said second oligonucleotide comprises a detectable label, with a cellular or tissue extract suspected of containing a plurality of sequence specific DNA binding proteins for a time sufficient to permit, sequence-specific binding between said duplex and said binding proteins; (b) contacting the mixture from step (a) with a cleavage reagent that is capable of cleaving said detection duplex, wherein cleavage of said detection duplex is inhibited by binding of said DNA binding protein to said duplex; (c) capturing the resulting mixture on a solid support by hybridizing said capture tag to a complementary oligonucleotide on said solid support and (c) detecting the inhibition of said cleavage by said DNA binding protein by detecting fee presence or absence of the label on said solid support.