Universal protein-binding microarrays for the comprehensive characterization of the DNA-binding specificities of transcription factors.
Universal protein-binding microarrays for the comprehensive characterization of the DNA-binding specificities of transcription factors.
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DOI:
10.1038/nprot.2008.195
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发表时间:
2009
期刊:
影响因子:
14.8
通讯作者:
Bulyk, Martha L.
中科院分区:
文献类型:
--
作者:
Berger, Michael F.;Bulyk, Martha L.
Protein binding microarray (PBM) technology provides a rapid, high-throughput means of characterizing the in vitro DNA binding specificities of transcription factors (TFs). Using high-density, custom-designed microarrays containing all 10-mer sequence variants, one can obtain comprehensive binding site measurements for any TF, regardless of its structural class or species of origin. Here, we present a protocol for the examination and analysis of TF binding specificities at high resolution using such ‘all 10-mer’ universal PBMs. This procedure involves double-stranding a commercially synthesized DNA oligonucleotide array, binding a TF directly to the double-stranded DNA microarray, and labeling the protein-bound microarray with a fluorophore-conjugated antibody. We describe how to computationally extract the relative binding preferences of the examined TF for all possible contiguous and gapped 8-mers over the full range of affinities, from highest affinity sites to nonspecific sites. Multiple proteins can be tested in parallel in separate chambers on a single microarray, enabling the processing of a dozen or more TFs in a single day.
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