Biochemistry : Isomerases

Study concepts, example questions & explanations for Biochemistry

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Example Questions

Example Question #19 : Protein Structure And Functions

Phosphoglucomutase is an enzyme seen in glycogen breakdown. It is responsible for converting glucose-1-phosphate () to glucose-6-phosphate ().  

Based on this action, to which enzyme class does phosphoglucomutase belong?

Possible Answers:

Isomerase

Oxidoreductase

Ligase

Lyase

Correct answer:

Isomerase

Explanation:

Phosphoglucomutase is responsible for altering the position of the phosphate on the glucose from the "1" position to the "6" position. However, notice how the molecular formula for the product and the substrate are the same. Enzymes that rearrange the structure of a molecule in this manner are referred to as isomerase enzymes.

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