Structural highlights
Function[ARP8_YEAST] Probably involved in transcription regulation via its interaction with the INO80 complex, a chromatin remodeling complex. Exhibits low basal ATPase activity, and unable to polymerize. Strongly prefer nucleosomes and H3-H4 tetramers over H2A-H2B dimers, suggesting it may act as a nucleosome recognition module within the complex.[1] Publication Abstract from PubMedActin-related protein Arp8 is a component of the INO80 chromatin remodeling complex. Yeast Arp8 (yArp8) comprises two domains: a 25-KDa N-terminal domain, found only in yeast, and a 75-KDa C-terminal domain (yArp8CTD) that contains the actin fold and is conserved across other species. The crystal structure shows that yArp8CTD contains three insertions within the actin core. Using a combination of biochemistry and EM, we show that Arp8 forms a complex with nucleosomes, and that the principal interactions are via the H3 and H4 histones, mediated through one of the yArp8 insertions. We show that recombinant yArp8 exists in monomeric and dimeric states, but the dimer is the biologically relevant form required for stable interactions with histones that exploits the twofold symmetry of the nucleosome core. Taken together, these data provide unique insight into the stoichiometry, architecture, and molecular interactions between components of the INO80 remodeling complex and nucleosomes, providing a first step toward building up the structure of the complex. Interactions between the nucleosome histone core and Arp8 in the INO80 chromatin remodeling complex.,Saravanan M, Wuerges J, Bose D, McCormack EA, Cook NJ, Zhang X, Wigley DB Proc Natl Acad Sci U S A. 2012 Dec 18;109(51):20883-8. doi:, 10.1073/pnas.1214735109. Epub 2012 Dec 3. PMID:23213201[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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