Abstract
The evolutionarily conserved Swi3p, Rsc8p and Moira (SWIRM) domain is found in many chromosomal proteins involved in chromatin modifications or remodeling. Here we report the three-dimensional solution structure of the SWIRM domain from the human transcriptional adaptor ADA2α. The structure reveals a five-helix bundle consisting of two helix-turn-helix motifs connected by a central long helix, reminiscent of the histone fold. Using structural and biochemical analyses, we showed that the SWIRM domains of human ADA2α and SMARC2 bind to double-stranded and nucleosomal DNA, and we identified amino acid residues required for this function. We demonstrated that the ADA2α SWIRM domain is colocalized with lysine-acetylated histone H3 in the cell nucleus and that it potentiates the ACF remodeling activity by enhancing accessibility of nucleosomal linker DNA bound to histone H1. These data suggest a functional role of the SWIRM domain in chromatin remodeling.
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Acknowledgements
The authors gratefully acknowledge M. Bauck for critical reading of the manuscript, S. Mujtaba for technical help and S. Hearn at Cold Spring Harbor Laboratory Microscopy Facility for technical assistance in performing the confocal laser scanning microscopy. This work was supported by grants from the US National Institutes of Health to M.-M.Z. and M.J.W.
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Supplementary information
Supplementary Fig. 1
Structure-based sequence alignment of SWIRM domains. (PDF 385 kb)
Supplementary Fig. 2
Three-dimensional NMR structure of the human ADA2α SWIRM domain. (PDF 50 kb)
Supplementary Fig. 3
Assessment of the R428A mutation effect on the ADA2 SWIRM domain structure. (PDF 23 kb)
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Qian, C., Zhang, Q., Li, S. et al. Structure and chromosomal DNA binding of the SWIRM domain. Nat Struct Mol Biol 12, 1078–1085 (2005). https://doi.org/10.1038/nsmb1022
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DOI: https://doi.org/10.1038/nsmb1022
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