What enzyme breaks amino acid to ammonia?

The enzyme responsible for breaking down amino acids to ammonia is called glutamate dehydrogenase. This enzyme catalyzes the oxidative deamination of glutamate, converting it into alpha-ketoglutarate while releasing ammonia (NH3) in the process. This reaction is crucial for nitrogen metabolism in organisms, allowing for the excretion of excess nitrogen. Additionally, other enzymes, such as amino acid deaminases, can also facilitate the release of ammonia from various amino acids.