Protocol to detect nucleotide-protein interaction in vitro using a non-radioactive competitive electrophoretic mobility shift assay
Fang Wang, Ting Yao, Wen Yang, Pan Wu, Yutao Liu, Bin Yang
Abstract
Electrophoretic mobility shift assay (EMSA) is a classical and popular approach for DNA/RNA protein-binding affinity detection in vitro. This protocol describes a competitive EMSA assay using digoxigenin (DIG)-labeled probe, which solves the safety issues and limitations attributed to the short lifespan of the 32P-radiolabeled DNA probe. We detail steps for DNA probe preparation, protein-DNA mixture coincubation, EMSA, and competitive EMSA process. We optimize the standard DIG-ddUTP-labeling EMSA protocol to high sensitivity with reproducible results. For complete details on the use and execution of this protocol, please refer to Feng et al. (2022).
Topics & Concepts
Electrophoretic mobility shift assayDigoxigeninDNAIn vitroElectrophoresisMolecular biologyChemistryNucleotideComputational biologyBiologyBiochemistryGene expressionIn situ hybridizationGeneRNA and protein synthesis mechanismsRNA Research and SplicingViral Infections and Immunology Research