title: An optimized assay for transcription factor NF-kappaB with dsDNA-coupled microplate.
abstract: To develop an EMSA-free assay approach for analyzing the sequence-specific DNA-binding proteins (DBPs), an easy cost-effective dsDNA-coupled plate (dcPlate) was developed in our lab for this purpose. In this paper, the assay conditions of such dcPlate were fully optimized for detecting an important transcription factor, NF-kappaB. The optimized parameters of dcPlate for assay of NF-kappaB were as follows: immobilized DNA probe at the concentration of 25 pmol/100 microL-well, incubation time of 90 min for NF-kappaB binding to dcPlate, primary and secondary antibody concentration of 0.1 microL/100 microL dilution, incubation time of 90 min for primary antibody binding to NF-kappaB, temperature of 25 degrees C for the above process, colorimetric developing time for 30 min. After optimization, the signal was improved three times higher than that from not optimized conditions. The linear colorimetric detection ranges of the purified recombinant NF-kappaB p50 and the cell nuclear extract were from 0.59 to 75 ng/well and 0.313 to 10 microg/well, respectively.
authors.affiliation: State Key Laboratory of Bioelectronics, Southeast University, Nanjing 210096, China.
authors.forename: Jian Lin
authors.initials: JL
authors.lastname: Li
authors.forename: Hong mei
authors.initials: Hm
authors.lastname: Chen
authors.forename: Min li
authors.initials: Ml
authors.lastname: Li
authors.forename: Dong
authors.initials: D
authors.lastname: Hua
authors.forename: Zu hong
authors.initials: Zh
authors.lastname: Lu
authors.forename: Jin ke
authors.initials: Jk
authors.lastname: Wang
mesh_terms: D003124:Colorimetry; D004247:DNA / Q000737:chemistry*; D006801:Humans; D052002:NF-kappa B p50 Subunit / Q000032:analysis*; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation* / Q000379:methods*; D011994:Recombinant Proteins / Q000032:analysis; D013499:Surface Properties
chemical_list: D052002:NF-kappa B p50 Subunit; D011994:Recombinant Proteins; D004247:DNA