Required for recruitment of CENPA to centromeres and normal chromosome segregation during mitosis. Interacts with SP1 (PubMed:10976766). Interacts with MIS18A. Identified in a complex containing MIS18A, OIP5/MIS18B, MIS18BP1, RBBP7 and RBBP4 (PubMed:17199038). Interacts with KAT7/HBO1 (PubMed:27270040). Interacts (via N-terminus) with FLNA (via N-terminus) (By similarity). Associated with centromeres in interphase cells, from late anaphase to the G1 phase. Not detected on centromeres during earlier phases of mitosis. Associated with chromatin.