Structural highlights
Function
[SWI3_YEAST] Involved in transcriptional activation. Component of the SWI/SNF complex, an ATP-dependent chromatin-remodeling complex, which is required for the positive and negative regulation of gene expression of a large number of genes. It changes chromatin structure by altering DNA-histone contacts within a nucleosome, leading eventually to a change in nucleosome position, thus facilitating or repressing binding of gene-specific transcription factors.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The SWIRM domain is a module found in the Swi3 and Rsc8 subunits of SWI/SNF-family chromatin remodeling complexes, and the Ada2 and BHC110/LSD1 subunits of chromatin modification complexes. Here we report the high-resolution crystal structure of the SWIRM domain from Swi3 and characterize the in vitro and in vivo function of the SWIRM domains from Saccharomyces cerevisiae Swi3 and Rsc8. The Swi3 SWIRM forms a four-helix bundle containing a pseudo 2-fold axis and a helix-turn-helix motif commonly found in DNA-binding proteins. We show that the Swi3 SWIRM binds free DNA and mononucleosomes with high and comparable affinity and that a subset of Swi3 substitution mutants that display growth defects in vivo also show impaired DNA-binding activity in vitro, consistent with a nucleosome targeting function of this domain. Genetic and biochemical studies also reveal that the Rsc8 and Swi3 SWIRM domains are essential for the proper assembly and in vivo functions of their respective complexes. Together, these studies identify the SWIRM domain as an essential multifunctional module for the regulation of gene expression.
Structure and function of the SWIRM domain, a conserved protein module found in chromatin regulatory complexes.,Da G, Lenkart J, Zhao K, Shiekhattar R, Cairns BR, Marmorstein R Proc Natl Acad Sci U S A. 2006 Feb 14;103(7):2057-62. Epub 2006 Feb 3. PMID:16461455[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Da G, Lenkart J, Zhao K, Shiekhattar R, Cairns BR, Marmorstein R. Structure and function of the SWIRM domain, a conserved protein module found in chromatin regulatory complexes. Proc Natl Acad Sci U S A. 2006 Feb 14;103(7):2057-62. Epub 2006 Feb 3. PMID:16461455
