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Chapter 21: Q8CP (page 728)

Summarize the reactions that release an amino acid鈥檚 amino group as ammonia.

Short Answer

Expert verified

In the reaction of glutamate dehydrogenase (GDH) releases ammonia.

Step by step solution

01

Glutamate dehydrogenase.  

Naturally, transamination does not lead to any net deamination. However, glutamate dehydrogenase (GDH) has the ability to oxidatively deaminate glutamate, creating ammonia and regenerating -ketoglutarate for further transamination processes.

02

Formation of α-iminoglutarate

The only known enzyme that can take either NAD+ or NADP+ as its redox cofactor is glutamate dehydrogenase, a mitochondrial enzyme. In order to create -iminoglutarate, which is then hydrolyzed into -ketoglutarate and ammonium ion, oxidation is considered to take place when a hydride ion is transferred from glutamate's C atom to NAD(P)+.

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