Key Cofactors and Electron Carriers in the Electron Transport Chain (ETC)

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6 Terms

1
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Cofactors of EtC

NADH

FMN

FADH2

CoQ

Fe_S

Heme

2
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NADH

free water soluble electron carrier

2 electrons are transfered

oftern the first step in the ETC is oxidation of NADH to NAD+

3
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Flavin Mononucleotide

Flavin adenine Dinucleotide

water soluble but protein bound electron carriers

(flavoproteins)

1 or 2 electron can be transfered

can generate a semiquinone

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Coenzyme Q

Free lipid soluble electron carrier

1 or 2 electrons can be transferred

can generate a semiquinone

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Iron-sulfur clusters

Prottein bound electron carrier

1 electron

found as 2Fe-2S or 4Fe-4S

electron is transferred to sulfur which is then stabilized by iron

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Heme

protein ound electron carrier (cytochromes)

1 electron

consists of a large porphyrin ring and Fe atom in the center