1. 14 points For each glycolytic intermediate below, select the type of reaction
ID: 254877 • Letter: 1
Question
1. 14 points For each glycolytic intermediate below, select the type of reaction(s) that will occur next in glycolysis phosphorylation via ATP oxidation of aldehyde enol-to-keto isomerization dehydration phosphorylation via Pi aldose-to-ketose isomerizationketose-to-aldose isomerization phosphate isomerization aldol cleavage dephosphorylation hydration phosphorylation via ATP oxidation of aldehyde enol-to-keto isomerization dehydration phosphorylation via Pi aldose-to-ketose isomerization phosphate isomerization aldol cleavage dephosphorylation ketose-to-aldose isomerization hydrationExplanation / Answer
Dehydration
In this reaction, which is the dehydration of an alcohol, the -OH on C-3 and the -H on C-2 are removed to make a water molecule. At the same time a double bond forms between C-2 and C-3. This change makes the compound somewhat unstable, but energy for the final step of glycolysis.
This reaction is catalyzed by enolase.
Dehydration of 2 phosphoglycerate and will for the phosphoenol pyruvate2-phosphoglycerate is converted to phosphoenol pyruvate by the enzyme enolase.
One water molecule is removed.
A high energy phosphate bond is produced. The reaction is reversible.
Enolase requires Mg++.
Aldose to Ketose isomerization
The glucose-6-phosphate is changed into an isomer, fructose-6-phosphate. This means that the number of atoms is unchanged, but their positions have changed.
This works because the ring forms may open to the chain form, and then the aldehyde group on glucose is transformed to the ketone group on fructose. The ring then closes to form the fructose-6-phosphate.
Glucose-6-phosphate is isomerised to fructose-6-phosphate by phosphohexose isomerase.
This reaction involves an aldose-ketose isomerisastion catalysed by phosphohexose isomerase. There is opening of the glucopyranose ring of glucose-6-phosphate to a linear structure which then changes to the furanose ring structure of fructose-6-phosphate.
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