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Interaction of the pioneer transcription factor GATA3 with nucleosomes
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Journal Article
Interaction of the pioneer transcription factor GATA3 with nucleosomes
2020
Overview
During cellular reprogramming, the pioneer transcription factor GATA3 binds chromatin, and in a context-dependent manner directs local chromatin remodeling and enhancer formation. Here, we use high-resolution nucleosome mapping in human cells to explore the impact of the position of GATA motifs on the surface of nucleosomes on productive enhancer formation, finding productivity correlates with binding sites located near the nucleosomal dyad axis. Biochemical experiments with model nucleosomes demonstrate sufficiently stable transcription factor-nucleosome interaction to empower cryo-electron microscopy structure determination of the complex at 3.15 Å resolution. The GATA3 zinc fingers efficiently bind their target 5′-GAT-3′ sequences in the nucleosome when they are located in solvent accessible, consecutive major grooves without significant changes in nucleosome structure. Analysis of genomic loci bound by GATA3 during reprogramming suggests a correlation of recognition motif sequence and spacing that may distinguish productivity of new enhancer formation.
GATA 3 functions as a pioneer factor during cellular reprogramming. Here the authors delineate nucleosome positioning relative to GATA3 binding motifs and describe the structure of a GATA3–nucleosome complex; providing insight into how a pioneer factor interacts with nucleosomes and catalyze their local remodelling to produce an accessible enhancer.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 45
/ 82/29
/ 82/83
/ Amino Acid Motifs - genetics
/ Chromatin Assembly and Disassembly - genetics
/ Chromatin Immunoprecipitation Sequencing
/ GATA3 Transcription Factor - chemistry
/ GATA3 Transcription Factor - genetics
/ GATA3 Transcription Factor - metabolism
/ GATA3 Transcription Factor - ultrastructure
/ Grooves
/ Humanities and Social Sciences
/ Humans
/ Mapping
/ Nucleosomes - ultrastructure
/ Science
