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Ever since the discovery of the nucleosome in 1974, scientists have stumbled upon discrete particles in which DNA is wrapped around histone complexes of different stoichiometries: octasomes, hexasomes, tetrasomes, “split” half-nucleosomes, and, recently, bona fide hemisomes. Do all these particles exist in vivo? Under what conditions? What is their physiological significance in the complex DNA transactions...
Fpr4, a FK506-binding protein (FKBP), is a recently identified novel histone chaperone. How it interacts with histones and facilitates their deposition onto DNA, however, are not understood. Here, we report a functional analysis that shows Fpr4 forms complexes with histones and facilitates nucleosome assembly like previously characterized acidic histone chaperones. We also show that the chaperone...
Methods are described for the utilization of formaldehyde as a reversible cross-linking agent for the characterization of protein–protein and protein–DNA interactions. The methods include a description of procedures to: (1) isolate and characterize transcriptionally active chromatin from cells cross-linked with formaldehyde; (2) study histone mobility during replication and transcription by the characterization...
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