8ets
From Proteopedia
Class1 of the INO80-Hexasome complex
Structural highlights
FunctionINO80_YEAST ATPase component of the INO80 complex which remodels chromatin by shifting nucleosomes and is involved in DNA repair (PubMed:10952318, PubMed:12887900). Its ability to induce transcription of some phosphate-responsive genes is modulated by inositol polyphosphates (PubMed:10952318, PubMed:10361278). The INO80 complex is involved in DNA repair by associating with 'Ser-129' phosphorylated H2A histones as a response to DNA damage (PubMed:15607974, PubMed:15607975).[1] [2] [3] [4] [5] Publication Abstract from PubMedUnlike other chromatin remodelers, INO80 preferentially mobilizes hexasomes, which can form during transcription. Why INO80 prefers hexasomes over nucleosomes remains unclear. Here, we report structures of Saccharomyces cerevisiae INO80 bound to a hexasome or a nucleosome. INO80 binds the two substrates in substantially different orientations. On a hexasome, INO80 places its ATPase subunit, Ino80, at superhelical location -2 (SHL -2), in contrast to SHL -6 and SHL -7, as previously seen on nucleosomes. Our results suggest that INO80 action on hexasomes resembles action by other remodelers on nucleosomes such that Ino80 is maximally active near SHL -2. The SHL -2 position also plays a critical role for nucleosome remodeling by INO80. Overall, the mechanistic adaptations used by INO80 for preferential hexasome sliding imply that subnucleosomal particles play considerable regulatory roles. Reorientation of INO80 on hexasomes reveals basis for mechanistic versatility.,Wu H, Munoz EN, Hsieh LJ, Chio US, Gourdet MA, Narlikar GJ, Cheng Y Science. 2023 Jul 21;381(6655):319-324. doi: 10.1126/science.adf4197. Epub 2023 , Jun 29. PMID:37384669[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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