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Chromatin remodeling enzymes: who's on first?
1Program in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Biotech 2, Suite 301, Worcester, MA 01605, USA.
Abstract:
A central problem in the regulation of eukaryotic gene expression is understanding how gene-specific transcriptional activators orchestrate the recruitment of the myriad proteins that are required for transcription initiation. An emerging view indicates that activators must first target two types of chromatin remodeling enzyme to the promoter region: an ATP-dependent SWI/SNF-like complex and a histone acetyltransferase. These two enzymes appear to act synergistically to establish a local chromatin structure that is permissive for subsequent events. Furthermore, several recent studies indicate that the recruitment of chromatin remodeling enzymes must follow an obligatory, sequential order of events that is determined by either promoter context or cell-cycle position. Here we review recent developments concerning the role of chromatin remodeling enzymes in gene regulation, and propose several models to explain how different chromatin remodeling activities can be functionally coupled.
Insights
Transcriptional activators recruit chromatin remodeling enzymes, including SWI/SNF-like complexes and histone acetyltransferases, to initiate gene transcription. Their sequential action establishes permissive chromatin structures for gene regulation.
Area of Science:
- Molecular Biology
- Epigenetics
- Gene Regulation
Background:
- Understanding how gene-specific transcriptional activators recruit proteins for transcription initiation is crucial.
- Gene expression regulation involves complex protein interactions at the promoter region.
Purpose of the Study:
- To review recent developments in the role of chromatin remodeling enzymes in gene regulation.
- To propose models explaining the functional coupling of different chromatin remodeling activities.
Main Methods:
- Literature review of recent studies on chromatin remodeling enzymes.
- Analysis of sequential recruitment of enzymes and their synergistic action.
Main Results:
- Activators target SWI/SNF-like complexes and histone acetyltransferases to promoters.
- These enzymes act synergistically to create a permissive chromatin structure.
- Enzyme recruitment follows a specific, sequential order influenced by promoter context or cell cycle.
Conclusions:
- Chromatin remodeling enzymes play a vital role in orchestrating transcription initiation.
- Sequential and synergistic actions of these enzymes are key to eukaryotic gene expression.
- Proposed models offer insights into the functional coupling of chromatin remodeling activities.