Conserved component of the MICOS complex; MICOS (formerly MINOS or MitOS), a mitochondrial inner membrane (MIM) complex extends into the intermembrane space and has a role in the maintenance of crista junctions, MIM architecture, and formation of contact sites to the outer membrane; forms a subcomplex with Mic12p and Mic27p whose assembly and stability requires cardiolipin; homo-oligomers cause membrane bending; oligomerization state regulated by Mic26p and Mic27p; ortholog of human MINOS1