- high-resolution terminology - matching measurements at high-resolution
Glutamate-anaplerotic pathway control state
Description
G: Glutamate is an anaplerotic NADH-linked type 4 substrate (N). When supplied as the sole fuel substrate in the glutamate pathway control state, G is transported by the electroneutral glutamate-/OH- exchanger, and is oxidised via mt-glutamate dehydrogenase in the mitochondrial matrix. The G-pathway plays an important role in glutaminolysis.
Abbreviation: G
Reference: Gnaiger 2014 MitoPathways - Chapter 3.3
MitoPedia concepts:
SUIT state
Communicated by Gnaiger E 2016-01-25, edited 2016-11-29.
G(L)
G(P)
G(E)
Details
- In human skeletal muscle mitochondria, OXPHOS capacity with glutamate alone (GP) is 50% to 85% of respiration in the GM pathway control state (GMP). Accumulation of fumarate inhibits succinate dehydrogenase and glutamate dehydrogenase.
- Glutaminolysis: Glutamate derived from hydrolyzation of glutamine is an important aerobic substrate in cultured cells, supporting anaplerosis. Mitochondrial glutamate dehydrogenase is particularly active in astrocytes, preventing glutamate induced neurotoxicity.
- Anaplerosis from malate: mtNAD-malic enzyme supports an anaplerotic pathway when carbohydrate is limiting.
