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Published on: August 24, 2013
A Structural Model of the Endogenous Human BAF Complex Informs Disease Mechanisms
Nazar Mashtalir1, Hiroshi Suzuki2, Daniel P Farrell3
1Department of Pediatric Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA, USA; Broad Institute of MIT and Harvard, Cambridge, MA, USA.
Researchers reveal the structure of the human BAF complex bound to nucleosomes, detailing how it remodels chromatin. This structural insight into the BAF complex (BRG1/BRM-associated factor) aids understanding of its role in health and disease.
Area of Science:
- Molecular Biology
- Structural Biology
- Genomics
Background:
- Mammalian SWI/SNF complexes are crucial ATP-dependent chromatin remodelers.
- These complexes regulate genomic architecture and gene expression.
Purpose of the Study:
- To present a structural model of the human canonical BAF complex bound to a nucleosome.
- To investigate the functional impact of disease-associated mutations.
Main Methods:
- Cryoelectron microscopy (cryo-EM)
- Cross-linking mass spectrometry
- Homology modeling
- Biochemical assays
Main Results:
- A structural model of the nucleosome-bound BAF complex was generated.
- BAF complexes engage nucleosome acidic patches via specific subunits (SMARCB1, SMARCA4/2).
- Disease mutations in these regions impair chromatin remodeling.
- Cancer-associated mutations affecting BAF interfaces were identified.
Conclusions:
- The study provides biophysical insights into BAF complex function.
- Understanding BAF structure is key to deciphering its role in normal cellular processes and diseases like cancer.
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