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- W2045972663 abstract "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 of histone and NCP structure; and (2) have an R0 of 20 A, which is much less than the dimensions of the NCP (approximately 50 A width and approximately 100 A diameter). Equilibrium protein unfolding titrations indicate that the donor and acceptor moieties have minimal effects on the stability of the H2A-H2B dimer and (H3-H4)2 tetramer. NCPs containing the various FRET pairs were reconstituted with the 601 DNA positioning element. Equilibrium NaCl-induced dissociation of the modified NCPs showed that the 601 sequence stabilized the NCP to dimer dissociation relative to weaker positioning sequences. This finding implies a significant role for the H2A-H2B dimers in determining the DNA sequence dependence of NCP stability. The free energy of dissociation determined from reversible and well-defined sigmoidal transitions revealed two distinct phases reflecting the dissociation of individual H2A-H2B dimers, confirming cooperativity as suggested previously; these data allow quantitative description of the cooperativity. The FRET system was then used to study the effects of the histone variant H2A.Z on NCP stability; previous studies have reported both destabilizing and stabilizing effects. H2A.Z FRET NCP dissociation transitions suggest a slight increase in stability but a significant increase in cooperativity of the dimer dissociations. Thus, the utility of this protein-protein FRET system to monitor the effects of histone variants on NCP dynamics has been demonstrated, and the system appears equally well-suited for dissection of the kinetic processes of dimer association and dissociation from the NCP." @default.
- W2045972663 created "2016-06-24" @default.
- W2045972663 creator A5010411578 @default.
- W2045972663 creator A5039282339 @default.
- W2045972663 creator A5076969060 @default.
- W2045972663 date "2007-08-01" @default.
- W2045972663 modified "2023-10-05" @default.
- W2045972663 title "Protein–Protein Förster Resonance Energy Transfer Analysis of Nucleosome Core Particles Containing H2A and H2A.Z" @default.
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- W2045972663 doi "https://doi.org/10.1016/j.jmb.2007.05.075" @default.
- W2045972663 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2031861" @default.
- W2045972663 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17597150" @default.
- W2045972663 hasPublicationYear "2007" @default.
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