Pentose Phosphate Pathway Flashcards Preview

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Flashcards in Pentose Phosphate Pathway Deck (7):
1

3 pentose phosphates that pentose phosphate pathway synthesizes

Ribulose 5-phosphate
Ribose 5- phosphate
Xylulose 5-phosphate

2

Oxidative stage

Glucose 6-phosphate -> ribulose 5-phosphate

3

Non-oxidative stage

If NADPH and nucleotides are needed, ribulose 5-phosphate is converted to ribose 5-phosphate
If NADPH is needed more than ribose 5-phosphate, then pentose phosphates are converted to glycolytic intermediates

4

# of glucose 6-phosphate molecules needed to complete 1 cycle of the pentose phosphate pathway

3 glucose 6-phosphate molecules needed

5

Isomerases

Convert ribulose 5-phosphate to xylulose 5-phosphate and ribose 5-phosphate

6

Transketolases

Catalyze transfer of a two-carbon segment from a ketose phosphate to an aldose phosphate
Xylulose 5-phosphate + ribose 5-phosphate -> glyceraldehyde 3-phosphate and a sedoheptulose 7-phosphate (7-carbon compound)

7

Transaldolases

Catalyze transfer of a 3-carbon segment from a ketose phosphate to an aldose phosphate
Sedoheptulose 7-phosphate + G3P -> erythrose 4-phosphate + fructose 6-phosphate