Functions as a chaperone necessary for a stable expression of the CYBA and CYBB subunits of the cytochrome b-245 heterodimer (By similarity). Controls the phagocyte respiratory burst and is essential for innate immunity (By similarity). Interacts with CYBB; CYBC1 may act as a chaperone stabilizing Cytochrome b-245 heterodimer. Belongs to the CYBC1 family.