Citric Acid Cycle (C.A.C.). Mitochondrial Structure (cont.)
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Transcript of Citric Acid Cycle (C.A.C.). Mitochondrial Structure (cont.)
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Citric Acid Cycle (C.A.C.)
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Mitochondrial Structure (cont.)
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TCA Cycle
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C
C
O-
Step 1
CO
O-
CO
O
Oxaloacetate
OH
C
||O
S CoA
C
O-
CO
C
O-
CO
C
O-
CO
Co - ASH
Citrate Synthase
Citrate (3° Alcohol)
CH3
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Step 2 & 3
HO
C
O-
CO
C
O-
CO
C
O-
CO
H
H2OC
O-
CO
C
O-
CO
C
O-
CO
C
O-
CO
C
O-
CO
C
O-
CO
H
HO
Citrate
Aconitase
Aconitate Isocitrate (2° alcohol)
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Step 4
C
O-
CO
C
O-
CO
C
O-
CO
HO
H
C
O-
CO
C
O-
CO
C
O-
CO
O
NAD+ NADH + H+
Isocitrate
Dehydrogenase
Isocitrate Oxalosuccinate
CONT. NEXT SLIDE
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C
O-
CO
C
C
O-
CO
O
CO2
- keto glutarate
Classic biological redox Rx.
2° alcohol oxidized to a keto
NAD+ reduced.
• Carboxylic acids that are to a keto group spontaneously decarboxylate.
Step 5
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Step 6
C
O-
CO
C
C
O-
CO
O
- keto glutarate
NAD+ NADH + H+
CoASHCO2 C
O-
CO
C
C SO
CoA
Succinate Co-A
PGTP = 8 Kcal/m
- keto dehydrogenase
CONT. NEXT SLIDE
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CoASH
H2O
GDP
GTP
ATP
ADP
C
O-
CO
C
C
O-O
Succinate
Succinate Synthetase
Step 7
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C
O -C
O
Succinate
HH
FAD FADH2
S.D.H
Malate
HOH
Fumarate
C HH
CO
O -
C
O -C
O
H
CH
CO
O -
CO -
CO
HHO
C HH
CO
O -
NAD + NAOD + H +
CO -
CO
O
C
CO
O -
O.A.A
Fumarase M.D.H
Trans Dehydrogenation 2° Alcohol
Oxidized to keto
NADH +
Step 8, 9, 10
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