Mitochondria are the power house of the cells as they generate most of the supply of energy in the form of adenosine tri-phosphate (ATP). Mitochondria are double membrane organelles comprising of an outer membrane and a folded inner membrane called cristae. Isolated mitochondria are a useful tool to study mitochondrial respiration, assembly of the respiratory complexes, apoptosis, mtDNA, mtRNA, protein profiling, and as a loading control. Highly pure yeast mitochondria are purified using standard protocol as mentioned in the Yeast Mitochondria Isolation Kit - Cat # K259-100 from Pichia pastoris.