It is primarily found in babies, though it is present in small amounts in adults around the kidneys and on the back of our necks.
On the cytoplasmic side a transaminase enzyme is used to remove an amino group from aspartate which is converted into oxaloacetate, then malate dehydrogenase enzyme uses an NADH cofactor to reduce oxaloacetate to malate which can be transported across the membrane because of the presence of a transporter.
The movement of oxaloacetate across the membrane transports electrons and is known as the outer ring.
The inner ring primary function is not to move electrons but regenerate the metabolites.
Glutamate in the matrix is converted into an a-ketoglutarate which is transported in an antiporter with malate.