What are the main mechanisms of chromatin remodeling?

What is the mechanism of action of chromatin remodeling complexes?

Results from biochemical and structural studies of the RSC chromatin-remodeling complex prompt a proposal for the remodeling mechanism: RSC binding to the nucleosome releases the DNA from the histone surface and initiates DNA translocation (through one or a small number of DNA base pairs); ATP binding completes

What are the three mechanisms by which chromatin remodelers can move nucleosomes?

nucleosome methylation nucleosome repositioning nucleosome sliding nucleosome acetylation nucleosome remodeling removal of nucleosomes.

What is process of chromatin remodeling?

Chromatin remodeling involves a dynamic interchange between open (transcriptionally active) and closed (transcriptionally repressed or silenced) chromatin structures and is controlled by enzymatic modification of the DNA and/or histone proteins, such as DNA methylation and histone acetylation, respectively.

What are chromatin remodeling factors?

Chromatin remodeling factors are key components involved in this process and include histone chaperones, histone modifying enzymes and ATP-dependent chromatin remodeling complexes. Several of these factors interact directly with components of the replication machinery.

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What is the mechanism of action of chromatin remodeling complexes quizlet?

What is the mechanism of action of chromatin-remodeling complexes? They bind directly to the DNA and reposition nucleosomes to make the DNA more accessible. They remove methyl groups from the DNA itself, resulting in DNA that is more accessible. They add acetyl groups to histones to activate or repress transcription.

What are the three mechanisms by which chromatin remodelers can move nucleosomes quizlet?

Three w ays; by altering nucleosome composition, by adding or removing covalent modifications to or from histones, and by repositioning the nucleosome on a gene region.

What are three ways in which gene regulation is accomplished by modifying the structure of chromatin?

It can be achieved by altering either the transcription of the gene (RNA level), the translation of the protein from that transcript or by altering the structure of DNA such that transcription cannot occur.

How do chromatin remodelers change the structure of the chromatin?

In contrast to histone modifications, which do not require energy, chromatin remodeling is an energy-driven process in which chromatin remodelers use the energy of ATP hydrolysis to change the nucleosome structure [49, 50]. … After DNA replication, chromatin remodelers pack genomic DNA into nucleosomes.

How is chromatin remodeling determined?

Nucleosome mobilization by chromatin remodeling factors is easily detected by observing band disappearance in gel, which in turn provides evidence for histone octamer displacement.

What is meant by nucleosome remodeling?

Abstract. Eukaryotic chromatin is kept flexible and dynamic to respond to environmental, metabolic, and developmental cues through the action of a family of so-called “nucleosome remodeling” ATPases. Consistent with their helicase ancestry, these enzymes experience conformation changes as they bind and hydrolyze ATP.

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