Directional conformer exchange in dihydrofolate reductase revealed by single-molecule nanopore recordings

Conformational heterogeneity is emerging as a defining characteristic of enzyme function. However, understanding the role of protein conformations requires their thermodynamic and kinetic characterization at the single-molecule level, which remains extremely challenging. Here we report the ligand-induced conformational changes of dihydrofolate reductase (DHFR) by measuring the modulation of the nanopore currents. The long observation time of the...