Fe-S Cys) Cys Cys FeS Fe,Sa Cys Cys Cys Fe2S2 Cys FeSa S Inorganic sulphur S S-cys
Fe-S S Inorganic sulphur S S-cys
Ubiquinone (Coenzyme Q,CoQ,Q)contains a long isoprenoid units tail (human:CoQ0)and transfer H+and e by conversion as follows. 0 0. HCO CH HCO CH3 HCO CHa CH H'te HCO (CH2-CH=C-CH2)H H,CO R H,CO 0 OH OH Quinone Semiquinone Quinone (oxidized (free radical (reduced form) form) form)
Ubiquinone (Coenzyme Q, CoQ, Q)contains a long isoprenoid units tail(human:CoQ10) and transfer H+ and e- by conversion as follows. Quinone (oxidized form) Semiquinone (free radical form) Quinone (reduced form)
NADH+H* FMN Reduced Fe2+-S NAD* FMNH, Oxidized Fe3+-S* QH2 Function of complex I FMN NADH 4Fe-4S matrix 2Fe-2S→QH2 cytosol
Function of complexⅠ NADH+H+ NAD+ FMN FMNH2 Reduced Fe2+-S Oxidized Fe3+-S Q QH2 matrix cytosol
3.ComplexⅡ:Succinate-CoQ Reductase composition:flavoprotein (FAD)iron-sulphur protein (Fe-S)cytochrome b function:electron tansfer from succinate to CoQ(ubiquinone) ComplexΠ succinate→ FAD;Fe-S;b;Fe-S CoQ
3. Complex Ⅱ: Succinate-CoQ Reductase Complex Ⅱ succinate→ FAD; Fe-S; b; Fe-S → CoQ ◆ function: electron tansfer from succinate to CoQ(ubiquinone) ◆ composition: flavoprotein(FAD)、iron-sulphur protein(Fe-S)、cytochrome b
H.C oisoalloxazine AMP FAD (flavin adenine dinulceotide)
isoalloxazine AMP FAD(flavin adenine dinulceotide)