Component of the MICOS complex, a large protein complex of the mitochondrial inner membrane that plays crucial roles in the maintenance of crista junctions, inner membrane architecture, and formation of contact sites to the outer membrane. Component of the mitochondrial contact site and cristae organizing system (MICOS) complex, composed of at least MIC10, MIC12, MIC19, MIC26, MIC27 and MIC60. This complex was also known under the names MINOS or MitOS complex. Enriched at crista junctions. Moderate changes in the mitochondrial morphology. Present with 5220 molecules/cell in log phase SD medium. Belongs to the apolipoprotein O/MICOS complex subunit Mic27 family. Yeast Mic26 subfamily.