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7 Cards in this Set

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  • Back
where do oxphos & photophos take place, respectively? what major reaction do they involve?
OxPhos - in mitochondria, involves reduction (NADH & FADH2 are electron donors)

Photophos - in chloroplasts, involves oxidation (NADP+ is final electron acceptor)
what are the similar mechnisms b/t them?
1. promote electron flow by chain of membrane-bound carriers
2. create UPHILL proton transport (generates electrochem potential!)
3. uses DOWNHILL flow of protons to generate ATP
name the universal electron carriers
Nicotinamide Nucleotides: NAD+ & NADP+ (DO NOT CROSS *inner* MITO MEMBRANE)

Flavin Nucleotides: FAD & FMN

Ubiquinone (Coenzyme Q) - can accept 1 (semiquinone) or 2 (ubiquinol) electrons, lipid soluble, remains in lipid bilayer

Cytochromes - contain Fe heme group (tightly but not covalently assoc. w/ protein), most are integral proteins in INNER mito membrane, 3 classes (a, b, c)

Fe-S Proteins: always 1 electron transfers, only one iron is oxidized or reduced in core?
name the four protein components of the mitochondrial ETC
I: NADH:ubiquinone oxidoreductase

II: Succinate dehydrogenase

III: Ubiquinone:Cytochrome C oxidoreductase

IV: Cytochrome Oxidase
Complex I: NADH:Ubiquinone oxidoreductase

- What are the prosthetic groups?
- Where to/from are the electrons transferred?
- Does it pump protons?
Prosthetic groups: FMN & Fe-S (6 diff iron centers)

Carrier of NADH to Ubiquinone

Pumps 4 H+ for every electron pair out of inner membrane

Catalyzed 2 coupled rxns:
1. electron transfer drives:
2. proton pump
Inhibitors of Complex I?
Amytal, Rotenone, Piericidin, all BLOCK ELECTRON FLOW to ubiquinone from Fe-S center
Complex II: Succinate Dehydrogenase
- What are the prosthetic groups?
- Where to/from are the electrons transferred?
- Does it pump protons?
Prosthetic groups: FAD & Fe-S (4 proteins + 2 prosthetic)

the only mem-bound enzyme in kerb's cycle

carrier from succinate to ubiquinone

does NOT pump protons