| ACF 1 ISWI complex ( ATP dependent chromatin assembly and remodeling factor [ ACF ] ) associates with histone fold proteins ( CHRAC 15 and CHRAC 17 in the human chromatin accessibility complex [ CHRAC ] ) whose functional relevance has been unclear . ^^^ Direct interaction of the CHRAC 15 / 17 complex with the ACF 1 subunit is essential for this process . ^^^ |