Protocol to prepare doubly labeled fluorescent nucleosomes for single-molecule fluorescence microscopy.

Protocol to prepare doubly labeled fluorescent nucleosomes for single-molecule fluorescence microscopy.
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DOI:
10.1016/j.xpro.2023.102229
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发表时间:
2023-04-19
期刊:
影响因子:
--
通讯作者:
Musselman, Catherine A.
Musselman, Catherine A.
中科院分区:
其他
文献类型:
--
作者:
Ghoneim, Mohamed;Musselman, Catherine A.

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Single-molecule fluorescence microscopy (SMFM) has been shown to be informative in understanding the interaction of chromatin-associated factors with nucleosomes, the basic building unit of chromatin. Here, we present a protocol for preparing doubly labeled fluorescent nucleosomes for SMFM. We describe steps for over-expression in E. coli and purification of recombinant human core histones. We then detail fluorescent labeling of histones and nucleosomal double-stranded DNA followed by octamer refolding and nucleosome reconstitution. Over-expression in E. coli and purification of recombinant human core histones Site-specific fluorescent labeling of histones PCR-based site-specific labeling of nucleosomal DNA Refolding of fluorescent octamer and reconstitution of fluorescent nucleosome Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics. Single-molecule fluorescence microscopy (SMFM) has been shown to be informative in understanding the interaction of chromatin-associated factors with nucleosomes, the basic building unit of chromatin. Here, we present a protocol for preparing doubly labeled fluorescent nucleosomes for SMFM. We describe steps for over-expression in E. coli and purification of recombinant human core histones. We then detail fluorescent labeling of histones and nucleosomal double-stranded DNA followed by octamer refolding and nucleosome reconstitution.
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