Carbohydrate metabolism- Synthesis of disaccharides and polysaccharides

Sugar nucleotide synthesis
1) Phosphorylation to glucose-6P (Enzyme: Hexokinase), 2) Conversion to glucose-1P (Enzyme: Phosphoglucomutase), 3) Reaction of glucose-1P with UTP-glucose (Enzyme: XDP-glucose pyrophosphorylase)
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Synthesis of sucrose from G3P
G3P converted to glucose-6-phosphate, reactions similar to glycolysis, UDP-Glc reacts with Fru-6P to give sucrose phosphate, then the phosphate groups are removed by a phosphatase
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What is starch made of?
Amylopectin and amylose
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What enzyme catalyses the synthesis of starch?
Starch synthase
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Describe the synthesis of starch
Start: linear chain of glucose units at least 11 long, transfer: a 6-7 glucose unit long chain from the non-reducing end, Break an a(1,4) bond, form a new a(1,6) band with a glucose unit on the same neighbouring chain, (Enzyme: Branching enzyme)
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Other cards in this set

Card 2

Front

Synthesis of sucrose from G3P

Back

G3P converted to glucose-6-phosphate, reactions similar to glycolysis, UDP-Glc reacts with Fru-6P to give sucrose phosphate, then the phosphate groups are removed by a phosphatase

Card 3

Front

What is starch made of?

Back

Preview of the front of card 3

Card 4

Front

What enzyme catalyses the synthesis of starch?

Back

Preview of the front of card 4

Card 5

Front

Describe the synthesis of starch

Back

Preview of the front of card 5

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