Proposed core component of the chromatin remodeling INO80 complex which is involved in transcriptional regulation, DNA replication and probably DNA repair. Involved in DNA double-strand break repair and UV-damage excision repair (By similarity). Component of the chromatin remodeling INO80 complex; specifically part of a complex module associated with the helicase ATP-binding domain and helicase C-terminal of INO80. Belongs to the actin family. ARP5 subfamily.