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How is it possible for the same heme molecule to have different reduction potentials? (in relation...

How is it possible for the same heme molecule to have different reduction potentials? (in relation to the ETC)

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Answer #1

Heme group consists Iron as a metal. Since Heme group has redox behaviour due to variable valency shown by Fe atom. Fe shows +2, +3 and +4 oxidation states in different biological conditions.

Fe+3 + e- ------->. Fe+2

Fe+4 + 2 e- --------> Fe+2

both the reaction will have different cell potential.

during respiration the partial pressure of CO2 changes the value of pH of blood and also Electrode potential changes, similarly formation of hydrogen bonding by Heme also changes the value of Electrode potential for Heme.

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