PMID: 29323271

Authors:

Aramayo RJ, Willhoft O, Ayala R, Bythell-Douglas R, Wigley DB, Zhang X

Title:

Cryo-EM structures of the human INO80 chromatin-remodeling complex.

Journal:

Nat Struct Mol Biol. 2018 Jan;25(1):37-44. doi: 10.1038/s41594-017-0003-7. Epub, 2017 Dec 4.

Abstract:

Access to chromatin for processes such as transcription and DNA repair requires the sliding of nucleosomes along DNA. This process is aided by chromatin-remodeling complexes, such as the multisubunit INO80 chromatin-remodeling complex. Here we present cryo-EM structures of the active core complex of human INO80 at 9.6 A, with portions at 4.1-A resolution, and reconstructions of combinations of subunits. Together, these structures reveal the architecture of the INO80 complex, including Ino80 and actin-related proteins, which is assembled around a single RUVBL1 (Tip49a) and RUVBL2 (Tip49b) AAA+ heterohexamer. An unusual spoked-wheel structural domain of the Ino80 subunit is engulfed by this heterohexamer; both, in combination, form the core of the complex. We also identify a cleft in RUVBL1 and RUVBL2, which forms a major interaction site for partner proteins and probably communicates these interactions to its nucleotide-binding sites.