The histone chaperone FACT recognizes histones H2A and H2B and plays an important role in transcription, replication, and DNA repair. Andreas Ladurner and colleagues describe the crystal structure of the complex formed between the Spt16M chaperone region of FACT and the H2A-H2B dimer and the structure of the "heterodimer" region of FACT. Spt16M interacts with histones in a variety of ways, and it also seems to block the interaction of H2B with DNA, which may explain how FACT can destabilize nucleosomes.
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