MICOS complex subunit MIC19 (CHCHD3)

Part of the MICOS complex, a large protein complex of the mitochondrial inner membrane that plays crucial roles in the maintenance of crista junctions, inner tissue structure, and formation of contact sites to the outer membrane. Has also been shown to function as a transcription factor which binds to the BAG1 promoter and represses BAG1 transcription.

Plays an essential role in the maintenance of the MICOS complex stability and the mitochondrial cristae morphology (PubMed:25781180). .