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303 exam3 lec. 13
glycolysis
30
Biochemistry
Undergraduate 3
12/07/2013

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Term
-- is the shared intermediate that links exergoin and entergonic rxns
Definition
ATP
Term
reducing power
Definition
reducing power is the e- carrying co factor that collects e- from oxidative rxns and donates them to reduction rxns.
Term
Glycolysis-
Definition
anaerobic degradation of glucose to pyruvate (or lactate)
Term
After glycolysis-
Definition
pyruvate can go three places for further catabolism
Term
Three places pyruvate can go after glycolysis:
Definition
1. fermentation to ETOH in yeast
2. Citric acid cycle
3. Lactate during vigorous exercise
Term
Fermentation products in yeast from one glycose-
Definition
one glucose= 2 pyruvate:
2 enthanol 2 CO2
Term
Citric acid cycle products from one glucose-
Definition
one glucose= 2 pyruvate:
4 CO2 and 4 H20
Term
vigorous exercise products from one glucose:
Definition
one glucose= 2 pyruvate:
2 lactates
Term
Glycolysis's 2 stages:
Definition
1. preparatory stage: phosphorylation of 1 glucose to 2 glyceraldehyde 3 phosphate
2. payoff phase G3P-> pyruvate
Term
Glycolysis ATP per stage and net
Definition
prep phase consumes 2 ATP
payoff produces 4 ATP
Net per glucose= 2 ATP
Term
Kinases catalyze:
Definition
the transfer of phosphorylation of 1 glucose to 2 glyceradldehyde 3 phosphate
Term
how are the negative charges balanced out in ATP
Definition
Phosphoryl groups have 2 negative charges. Formation of Mg 2+ complexes partially sheilds the negative charges and influences the confirmation of the phosphate groups in Nt.
Term
Mg with ATP and Mg with ADP=
Definition
MgADP -1
MgATP -2
Term
An isomerase catalyzes:
Open chain sugars-
Definition
isomerization between alpha hydroxy aldehyde and alpha hydroxy ketone
these are open chained sugars that undergo reversible tautomerization
Term
Ring opening in steps 1 and 4 are catalyzed by -- residue in --
H+
Definition
His residue in active site.
H+ is taken/added to C2
Term
Aldol catalyzes
Definition
aldol cleavage C6->C3
Term
Enzyme in step 5
Definition
TRIose phosphate isomerase
Term
dehydrogenases catalyze:
Definition
redox reaction where oxygen is not the oxidizing agent.
Term
What is the oxidizing agent in step 6 glycolysis:
energy derived-
Definition
NAD+ and the energy derived is used to drive the formation of the high energy bond in 1,3 bisphosphate.
Term
Mutase catalyzes:
Definition
the intramolecular migration of a functional group
Term
The unstable enol tautomer in step -- provides:
enolase-
Definition
step 9
provides the energy to make PEP a high energy compound. Enolase takes pyruvate to enol to from the keto form
Term
Pyruvate kinase-
Definition
phosphorylates ADP to form phosphoenolate pyruvate to pyruvate.
Term
Overall glycolysis rxn:
Definition
C6H12O6 +2ADP -3 + 2 Pi + 2 NAD+ ->
2C3H3O3-1 + 2ATP -4 +2NADH +2H+ +2H2O
Term
Major function of glycolysis:
Definition
generate some ATP anaerobical and generate pyruvate for further catabolism.
Term
After glycolysis rxn to lactate
purpose
Definition
2 pyruvate <-> 2 lactate
regenerate NAD+
2NADH-> 2NAD+
Term
bc pyruvate to lactate is reversible increasing blood lactate=
Definition
pyruvate formatin is too high compared to its utilization. Lactic acid will accumulate and lead to acidosis
Term
Anaerobic glycolysis to lactate is important for:
Definition
birth
sprints
cheetahs
Term
can yeast make lactate?
Definition
no, they dont have lactate DH
Term
Skeltal muscle types
Definition
red= slow long aerobic to Co2 marathon
white= fast power short sprint anaerobic to lactate
Term
Ethanol from pyruvate rxn:
Definition
C6H12O6 +2ATP +2Pi -> 2C2H5O +2HCO2- +ATP -4
=
2 pyruvate +NADH -> 2 ethanol +2CO2 +NAD+
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