Question
One step in the urea cycle for ridding the body of ammonia is the conversion of argininosuccinate to the amino acid arginine plus fumarate. Propose a mechanism for the reaction, and show the structure of arginine.
Step 1
This is a hydrolysis reaction, so we can use water as a nucleophile to attack the carbonyl carbon of the succinyl group. The tetrahedral intermediate then collapses, breaking the bond between the alpha and beta carbons and forming a carboxylate ion. The Show more…
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One step in the urea cycle for ridding the body of ammonia is the conversion of argininosuccinate to the amino acid arginine plus fumarate. Propose a mechanism for the reaction, and show the structure of arginine. (EQUATION CAN'T COPY)
In one of the reactions of the urea cycle, amino acid arginine is cleaved by the enzyme arginase to form urea and another amino acid, ornithine. Draw the mechanism.
Follow the Urea Cycle The Urea Cycle begins when _______________ reacts with Ornithine to form Citrulline; this occurs in the part of the cell called the _______________. The Citrulline is then transported into the part of the cell called the _______________ _______________. This Citrulline then reacts with the molecule called _______________, which just came from the part of the cell called the _______________. These two combined molecules then get converted into Arginine, which is the immediate precursor of the final molecule called _______________, which is now ready to leave from the part of the cell called the _______________ and enter _______________.
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