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303 exam3 lec. 14
TCA
16
Biochemistry
Undergraduate 3
12/07/2013

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Term
1st step pyruvate to acetyal coA happens (where?)
Definition
insdide mitochondria where it then enters the TCA
Term
stage two of aerobic metabolism
Definition
oxidation of acetl groups in citric acid cycle includes 4 steps where e- are removed
=acetyl co A oxidation via TCA
Term
stage 3 aerobic metabolism
Definition
e- are carried by NADH and FADH2 and funelled into a chain of mitochondrial e- carriers the respiratory chain ultimately reducing 02 to to H20
Term
stage 1 of aerobic metabolism
Definition
acetyl co A production from oxidation of FA glucose and some AA
Term
Glycolysis occurs in
oxygen?
Definition
the cytosol. No O2 needed= anaerobic, but can occur in the prescence of o2
Term
pyruvate Dehydrogenase
does-
5 coenzymes=
Definition
2pyruvate -> 2acteyl co A + 2Co2 in mitochondria
NAD+, FAD, coenzyme A, thiamine, phosphate, linolinc acid
Term
pyruvate DH rxn
Definition
decarboxylation: acetyl CoA ester of acetic acid (sulfur forms thioester) ketone group is oxided by NAD to carboxylic acid (thioester)= high energy bond= acetyl group would rather be somewhere else.
Term
coenzyme A derived from
Definition
ADP W/phosphoryl group n 3' hydroxyl + Panthenic acid (b vit.) + beta mercaptoethylamine
Term
citrate synthase makes
*
Definition
C-C bon= not easy= why high energy bond in acetyl CoA is improtant the acetyl group would rather be attachted to ketone group of oxaloacetate and coA comes off.
Term
Isomerase does-
Definition
hydroxyl grop does a intramolecular migration from 3C to 2C of iso citrate.
Term
step 3 of TCa is --
Definition
oxidative decarboxylation C6->C5 alpha ketoglutartae and 2nd CO2 comes off
Term
isocitrate DH in step 3
Definition
OH on 2C on isocitrate is oxided to ketone (by oxidizing agent NAD) causing carboxyl group to be unstabe and come off as CO2
Term
alpha ketoglutarate DH complex catalyzes:
Definition
C5->C4 +Co2
THIS RXN is similar to pyruvate DH**study similarities
Term
Pattern between pyruvate DH and alpha keto glutarate DH rxn
Definition
both rxns are oxidization phosphorylation of alpha keto acid. can be applied to an AA rxn. What vitamins and substraes/products are involved?
Term
Overview of TCA:
Definition
2C enter and condense with 4C of oxaloacetate= 6C rearrange +2x oxidative phosphorylation 2C flow in and 2C flow out as CO2. Important to form lots of reducing power for ETC drive ATP to form.
Term
Totals formed in TCA:
Definition
3 NADH 1 FADH2 1 GTP 2CO2 per pyruvate, so per glucose its times two
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