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A protein–protein Förster resonance energy transfer (FRET) system, employing probes at multiple positions, was designed to specifically monitor the dissociation of the H2A–H2B dimer from the nucleosome core particle (NCP). Tryptophan donors and Cys-AEDANS acceptors were chosen because, compared to previous NCP FRET fluorophores, they: (1) are smaller and less hydrophobic, which should minimize perturbations...
Understanding how the lipid environment influences transmembrane helix association requires thermodynamic measurements that can be interpreted in terms of specific chemical interactions. We have used Förster resonance energy transfer to measure dimerization of the glycophorin A transmembrane helix in detergent micelles. The observed Kd is at least two orders of magnitude weaker in sodium dodecyl sulfate...
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