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Basis of Specificity for a Conserved Promiscuous Chromatin Remodeling Protein [Mnase-seq]

ABSTRACT: We propose an interacting barrier mechanism for cooperation between Isw2-related proteins and sequence-specific DNA binding factors.

ORGANISM(S): Saccharomyces cerevisiae

PROVIDER: GSE150200 | GEO | 2020/08/31

REPOSITORIES: GEO

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Basis of Specificity for a Conserved Promiscuous Chromatin Remodeling Protein [ChIP-Seq]

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MNase titration-Seq of Saccharomyces cerevisiae.

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Histone octamer structure is altered early in ISW2 ATP-dependent remodeling of nucleosomes

Project description:Histone octamers are thought to be a rigid part of nucleosomes that shape chromatin and block cellular machinery from accessing DNA. ATP-dependent chromatin remodelers like ISW2 mobilize nucleosomes to provide DNA access. We find evidence for histone octamer distortion preceding DNA being moved into nucleosomes and processive movement of the ATPase motor of ISW2 on nucleosomal DNA. DNA entering nucleosome is uncoupled from the ATPase activity of ISW2 and alterations of the histone octamer structure mediated by ISW2 by deletion of the SANT domain from the C-terminus of the Isw2 catalytic subunit. We also find that restricting histone movement by chemical crosslinking traps remodeling intermediates resembling those seen by loss of the SANT domain, further supporting the importance of changes in histone octamer structure early in ISW2 remodeling. Transient octamer distortions are stabilized by H3-H4 tetramer disulfide crosslinking, thereby linking intrinsic histone octamer flexibility to chromatin remodeling.

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A conserved strategy of chalcone isomerase-like protein to rectify promiscuous chalcone synthase specificity.

Project description:Land plants produce diverse flavonoids for growth, survival, and reproduction. Chalcone synthase is the first committed enzyme of the flavonoid biosynthetic pathway and catalyzes the production of 2',4,4',6'-tetrahydroxychalcone (THC). However, it also produces other polyketides, including p-coumaroyltriacetic acid lactone (CTAL), because of the derailment of the chalcone-producing pathway. This promiscuity of CHS catalysis adversely affects the efficiency of flavonoid biosynthesis, although it is also believed to have led to the evolution of stilbene synthase and p-coumaroyltriacetic acid synthase. In this study, we establish that chalcone isomerase-like proteins (CHILs), which are encoded by genes that are ubiquitous in land plant genomes, bind to CHS to enhance THC production and decrease CTAL formation, thereby rectifying the promiscuous CHS catalysis. This CHIL function has been confirmed in diverse land plant species, and represents a conserved strategy facilitating the efficient influx of substrates from the phenylpropanoid pathway to the flavonoid pathway.

| S-EPMC7018950 | biostudies-literature

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