MeCP2 is an essential transcriptional repressor that mediates transcriptional inhibition by binding to methylated DNA. The binding specificity of MeCP2 protein to methylated DNA was considered to depend on its methyl-CpG binding domain (MBD). In this study, we used atomic force microscope based single-molecular force spectroscopy to investigate the interaction of MeCP2 MBD and methylated DNA. The specific interaction forces of the MeCP2 MBD-methylated DNA complexes were measured for the first time. The dynamics was also investigated by measuring the unbinding force of the complex at different loading rates. In addition, the distribution of unbinding forces and binding probabilities of MeCP2 MBD and different DNA were studied at the same loading rate. It was found that MeCP2 MBD had weak interaction with hemi-methylated and unmethylated DNA compared to methylated DNA. This work revealed the binding characteristics of MeCP2 MBD and methylated DNA at the single-molecule level. It provides a new idea for exploring the molecular mechanism of MeCP2 in regulating methylation signals.
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