Question

What is complex IV in ETS of mitochondria ? Mention its components.

Answer 1

Cytochrome oxidase (complex IV) catalyzes this transfer of electrons. Cytochromes a and a3 each contain a heme and two different proteins that each contain copper. Two electrons are required to reduce one atom of oxygen; therefore, for each NADH that is oxidized, one-half of O2 is converted to H2O.

Answer 2

ETS or electron transport system is an enzymatic series of complexes that are formed by cytochromes and coenzymes. The system works on the proton gradient created by the efflux of protons from mitochondrial matrix. It is the flux back of protons to the mitochondrial matrix through an ion channel ATP synthase that helps in production of ATP. ATP synthase is sometimes called complex V of ETS.

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