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62 Cards in this Set

  • Front
  • Back

TCA cycle occurs in the

Mitochondria

TCA cycle is a common pathway for

Carbohydrate, Lipid, and Protein Metabolism

Acetyl CoA used in

Fatty Acid Biosynthesis, Cholesterol

Enzymes Used in TCA Cycle(8)

Citrate Synthetase
Aconitase
Isocitrate Dehydrogenase
α-ketoglutarate dehydrogenase
Succinyl CoA Synthetase
Succinyl Dehydrogenase
Fumarase
Malate Dehydrogenase

Citrate Synthetase

Formation of Citrate from Oxaloacetate and Acetyl CoA

Aconitase

Citrate to Isocitrate
Moves C4 Hydroxyl to C5.

Cis-Aconitate intermediate

Isocitrate Dehydrogenase

Isocitrate to α-ketoglutarate
(removal of first CO2 molecule)

α-ketoglutarate Dehydrogenase

α-ketoglutarate to Succinyl CoA
(Removal of 2nd CO2 molecule)

Succinyl CoA Synthetase

Succinyl CoA to Succinate

produces GTP

Succinyl Dehydrogenase

Succinate to Fumarate
Oxidation of C2-C3 bonnd

Any time alkene is formed. ___ is produced

FADH2

Fumarase

Fumarate to Malate
(addition of water)

Malate Dehydrogenase

Malate to Oxaloacetate

All Dehydrogenases produces ____

NADH

Sites of TCA cycle Regulation(3)

Citrate Synthetase
Isocitrate Dehydrogenase
α-ketoglutarate Dehydrogenase

Citrate Synthetase Inhibited by

ATP, NADH, Citrate

Isocitrate Dehydrogenase Inhibited by

ATP, NADH

Isocitrate Dehydrogenase Activated by

ADP

α-Ketoglutarate Dehydrogenase Inhibited by

ATP
NADH
Succinyl CoA

α-ketoglutarate Dehydrogenase Compound takes ______ and makes ____

Takes: α-ketoglutarate, NAD+, Acetyl CoA

Makes:Succinyl CoA, NADH, CO2

3 Subunits of the AKDC(Cofactors)

α-ketoglutarate dehydrogenase(TPP)
transsuccinylase(lipoamide)
Dihydrolipoyl Dehydrogenase(FAD)

2 forms of Arsenic common in poisoning

Aresnite(AsO2-)
Arsenate(HAsO42-)

HAsO4 isoelectronic with____and competes with___

HPO4-
Phosphate

Bonding of ___ prevents reformation of lipoamide

Arsenite

Mesaprosol used to treat

Human African Trypanosomiasis

Oxidative Phosphorylation occurs in

Inner membrane of mitochondria

Inner Membrane of mitochondria made up of mostly

proteins

Outer membrane of mitochondria made up of mostly

phospholipids

PDC, most of TCA, and Beta-Oxidation contained in

Mitochondrial Matrix

Electron chain _____ the IMM

polarizes

4 protein Complexes of Electron Transport Chain(type)

I. NADH-coenzyme Q(oxidoreductase)

II. Succinate-coenzyme Q(Oxidoreductase)

III.CoEnzyme Q-Cytochrome C(oxidoreductase)

IV. Cytochrome C Oxidase

Complex I uses ____ to transfer electrons from ____.

Uses: Ubiquinone
Electrons from: NADH

Complex I first transfers electrons to

FMN

Complex III has ___ as a cofactor
Needs___ Cyt C per Hydroquinone

Cofactor:Iron
2

Complex IV has __ as a cofactor
Has to be run___times to make 2 molecules of water

Cofactors: Fe, Cu
4

Complex II has ___ as a cofactor
Does not act as___

Cofactor:FAD
Does not act as proton pump

Complex IV reduces ___ stepwise

Reduces Oxygen

_____found in mitochondrial space near complex IV

Superoxide Dismutase

Superoxide Dismutase

destroys any reactive oxygen species

2 Domains of ATP synthesis and their functions

F0=cylinder with proton channel
F1=ATP production

ATP transported from IMM to mitochondrial space by

ADP-ATP translocase.

Complex I Inhibitors

Rotenone, Barbituates

Rotenone used for

head lice, scabies

Complex III inhibitors

Antimycin A

Antimycin A used a

topical fungicide, miticide, and insecticide

Complex IV inhibitors

Molecules that can compete with Oxygen for binding.
CO, CN-, N3-(high affinity for Iron III)

2 pathways to transport NADH produced in Glycolysis

Glycerol Phosphate Shuttle
Malate-Aspartate Shuttle

___pathway loses energy when transporting NADH

Glycerol Phosphate Shuttle

Glycerol-3-phosphate dehydrogenase

Dihydroxyacetone Phosphate to Glycerol-3-Phosphate

Glycerol-Phosphate Shuttle carries electrons to complex___

II

2 Enzymes involved in Malate-Aspartate Shuttle

Malate Dehydrogenase
Aspartate Aminotransferase

2 pathways to transport NADH produced in Glycolysis

Glycerol Phosphate Shuttle
Malate-Aspartate Shuttle

___pathway loses energy when transporting NADH

Glycerol Phosphate Shuttle

Glycerol-3-phosphate dehydrogenase

Dihydroxyacetone Phosphate to Glycerol-3-Phosphate

Glycerol-Phosphate Shuttle carries electrons to complex___

II

2 Enzymes involved in Malate-Aspartate Shuttle

Malate Dehydrogenase
Aspartate Aminotransferase

2 Transporters used in Malate Aspartate Shuttle

ASP/GLU transporter
AKG/Mal transporter

both found on inner mitochondrial membrane

In malate-aspartate shuttle, NADH donates its electrons to

Oxaloacetate

Malate Dehydrogenase

Oxaloacetate to Malate

Aspartate Aminotransferase

Oxaloacetate to Aspartate
Glutamate to alpha ketoglutarate

AKG/Malate transporter

brings malate into the matrix
exports alpha ketoglutarate into the IMS

ASP/GLU transporter

brings Glutamate into the matrix
exports Aspartate into IMS