title: A free-labeled method for DNA-binding protein detection using a double-stranded DNA microarray.
abstract: We have developed a new type of double-stranded DNA microarray to perform detection of sequence-specific DNA-binding proteins. The DNA-binding site of a DNA-binding protein is divided into two fragments. One fragment was immobilized on an aldehyde-coated glass microscope slide surface via chemical bonds. The other fragment was labeled with a fluorescent molecule. When using this kind of double-stranded DNA microarray, the labeled DNA fragment was pre-incubated with detection sample for 5 to 10 minutes and then hybridized with the microarray. In our experiment, six different concentrations of Nuclear Factor kappa-B P50 homodimer in detection samples were tested. The microarray fluorescence intensity was obtained and the relationship between the intensity and the protein concentration was calculated. The detection results suggested that this free-labeled detection system could have the ability to be used in research and medical diagnosis and for high-throughput screening of drugs targeted to DNA-binding proteins.
authors.affiliation: Department of Biological Science and Medical Engineering, Key Lab of Molecular and Biomolecular Electronics, Ministry of Education, Southeast University, Nanjing 210096, P R. China.
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Bai
authors.forename: Qinyu
authors.initials: Q
authors.lastname: Ge
authors.forename: Quanjun
authors.initials: Q
authors.lastname: Liu
authors.forename: Tongxiang
authors.initials: T
authors.lastname: Li
authors.forename: Jinke
authors.initials: J
authors.lastname: Wang
authors.forename: Zuhong
authors.initials: Z
authors.lastname: Lu
mesh_terms: D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D015342:DNA Probes / Q000737:chemistry / Q000235:genetics; D004268:DNA-Binding Proteins / Q000032:analysis* / Q000737:chemistry / Q000235:genetics; D066298:In Vitro Techniques; D016328:NF-kappa B / Q000378:metabolism; D036103:Nanotechnology; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*
chemical_list: D015342:DNA Probes; D004268:DNA-Binding Proteins; D016328:NF-kappa B