The synergy between RSC,Nap1 and adjacent nucleosome in nucleosome remodeling |
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Authors: | Kuan-Wei Hsu Sih-Yao Chow Bo-Yu Su Yi-Han Lu Cyuan-Ji Chen Wen-Ling Chen Ming-Yuan Cheng Hsiu-Fang Fan |
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Affiliation: | Department of Life Sciences and Institute of Genome Sciences, National Yang-Ming University, Taiwan |
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Abstract: | Eukaryotes have evolved a specific strategy to package DNA. The nucleosome is a 147-base-pair DNA segment wrapped around histone core proteins that plays important roles regulating DNA-dependent biosynthesis and gene expression. Chromatin remodeling complexes (RSC, Remodel the Structure of Chromatin) hydrolyze ATP to perturb DNA-histone contacts, leading to nucleosome sliding and ejection. Here, we utilized tethered particle motion (TPM) experiments to investigate the mechanism of RSC-mediated nucleosome remodeling in detail. We observed ATP-dependent RSC-mediated DNA looping and nucleosome ejection along individual mononucleosomes and dinucleosomes. We found that nucleosome assembly protein 1 (Nap1) enhanced RSC-mediated nucleosome ejection in a two-step disassembly manner from dinucleosomes but not from mononucleosomes. Based on this work, we provide an entire reaction scheme for the RSC-mediated nucleosome remodeling process that includes DNA looping, nucleosome ejection, the influence of adjacent nucleosomes, and the coordinated action between Nap1 and RSC. |
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Keywords: | Corresponding author. |
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