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10 Cards in this Set

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  • Back
What is most important junction point?
G-6-Pi is in equilibrium with Glucose-1-pi
G-6-pi means use it
G-1-pi means store it
changes Glucose-6-pi into Glucose-1-pi which can be stored as Glycogen
Bond configuration in Glycogen
1=Branch point
2=Unbranched chain
1= alpha 1-6-glycosidic bond
2= alpha 1-4 glycosidic bond
Reducing vs. non-reducing end
Anomeric C at reducing end
Glucose liberated from non reducing end.
Structure of Glycogen
Glycogenin core
2nd, 3rd, and 4th tier (12 tot.)
2k non reducing ends, 55k glucoses
Phosphoglucomutase mechanism
adds a pi to G-1-pi to getG-1,6-BP
Le chatlier principle, conc. of each decides which way rxn. goes to G-1-pi or G-6-pi
UDP glucose pyrophosphorylase
Activates glucose molecule-
Glucose 1-6 phosphate is attached to UTP(uridine triphosphate) by UDP glucose pyrophosphorylase. A PPi released and that drives rx. forward. Product is UDP glucose which is ready for addition
Action of building Glycogen
Glycogenin core initiates rxn.
adds glucose from UDP glucose to a tyrosine residue of itself. Glycogenis catalyzes addition of firts 8 glucoses
Glycogen Synthase then adds rest of glucose
Glycogen branching enzyme
after addition of aboiut 11 glucoses is removes 7 and makes a alpha 1,6 branch
Glycogen Synthase
enzyme that adds glucoses to glycogen from udp-glucose
active=no pi