Reference: Hizume K (2024) In vitro observation of histone-hexamer association with and dissociation from the amino-terminal region of budding yeast Mcm2, a subunit of the replicative helicase. Biosci Biotechnol Biochem 88(11):1270-1278

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Abstract


During DNA replication, core histones that form nucleosomes on template strands are evicted and associate with newly synthesized strands to reform nucleosomes. Mcm2, a subunit of the Mcm2-7 complex, which is a core component of the replicative helicase, interacts with histones in the amino-terminal region (Mcm2N) and is involved in the parental histone recycling to lagging strands. Herein, the interaction of Mcm2N with histones was biochemically analyzed to reveal the molecular mechanisms underlying histone recycling by Mcm2N. With the addition of Mcm2N, a histone hexamer, comprising an H3-H4 tetramer and an H2A-H2B dimer, was excised from the histone octamer to form a complex with Mcm2N. The histone hexamer, but not H3-H4 tetramer was released from Mcm2N in the presence of Nap1, a histone chaperone. FACT, another histone chaperone, stabilized Mcm2N-histone hexamer complex to protect from Nap1-dependent dissociation. This study indicates cooperative histone transfer via Mcm2N and histone chaperones.

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Hizume K
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