Functions as component of the ISW2 complex, which acts in remodeling the chromatin by catalyzing an ATP-dependent alteration in the structure of nucleosomal DNA. The ISW2 complex is involved in coordinating transcriptional repression and in inheritance of telomeric silencing. It is involved in repression of MAT a-specific genes, INO1, and early meiotic genes during mitotic growth dependent upon transcription factor UME6 and in a parallel pathway to the RPD3-SIN3 histone deacetylase complex. ITC1 is required for nucleosome-stimulated ATPase activity and chromatin-remodeling activity of the complex. Required for the repression of MATa a-specific genes. Component of the ISW2 complex, which at least consists of ISW2, ITC1, DLS1 and DPB4. May form a stable subcomplex with ISW2. Present with 2610 molecules/cell in log phase SD medium.