Question

Consider enzyme 2 in the pyrimidine biosynthesis pathway. This enzyme is aspartate transcarbamoylase (ACTase), and it...

  1. Consider enzyme 2 in the pyrimidine biosynthesis pathway. This enzyme is aspartate transcarbamoylase (ACTase), and it catalyzes the conversion of aspartate and carbamoyl phosphate to carbamoyl aspartate.

Imagine a scenario in which CTP is inhibiting ACTase. The binding of CTP as an allosteric inhibitor converts ACTase into which allosteric form?

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Answer #1

Aspartate carbamoyltransferase catalyzes the following reaction.
ASpartate + Carbamoyl phosphate -----> Carbamoyl aspartate + Pi

It catalyzes the first step in the pyrimidine biosynthetic pathway.
It is an allosteric enzyme regulated by multiple factors. It exists in two states.
1. Relaxed state (R): High affinity/activity
The binding of substrates results in the shift towards the R-state.

2. Tense state (T): Low affinity/activity
The binding of CTP results in the shift towards the T-state

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