Isoleucine can attach to the enzyme threonine deaminase and can decrease its activity. Isoleucine can be classified as:

In this practice question it says, isoleucine can attach to the enzyme, threonine deaminase and decrease this activity. Isoleucine can be classified as alright. So it's either a positive allosteric regulator or it's a negative allosteric regulator. The key here is that they're saying that when it attaches to the enzyme, it decreases its activity. So this would mean that it is a negative allosteric regulator. Remember, here it would attach to the allosteric site of our enzyme and it would take away the active site. This, without the active site, we'd have a slowdown in the overall rate of the reaction and thereby give us a decrease in the enzyme's activity. No active site, no substrate binding to it, this leads to a decrease in the activity of the enzyme itself. So again, the answer here will be option B. Isoleucine represents a negative allosteric regulator.

Isoleucine can attach to the enzyme threonine deaminase and can d...

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Isoleucine can attach to the enzyme threonine deaminase and can decrease its activity. Isoleucine can be classified as:

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