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Using Enzyme-based Biosensors to Measure Tonic and Phasic Glutamate in Alzheimer's Mouse Models

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N-acetylglutamate synthase: structure, function and defects.

Ljubica Caldovic¹, Nicholas Ah Mew, Dashuang Shi

¹The Children's Research Institute, Children's National Medical Center, The George Washington University, Washington, DC 20010, USA.

Molecular Genetics and Metabolism

|March 23, 2010

Summary

N-acetylglutamate synthase (NAGS) is crucial for urea production and arginine synthesis. Its regulation by arginine differs between mammals and other organisms, a change linked to terrestrial life.

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Area of Science:

Biochemistry
Enzymology
Evolutionary Biology

Background:

N-acetylglutamate (NAG) is vital for mammalian ureagenesis and microbial arginine synthesis.
NAG synthase (NAGS) regulation by arginine differs between mammals (activation) and microbes/plants (inhibition).
This regulatory shift in NAGS occurred with the transition to terrestrial life.

Purpose of the Study:

To explore the structural and functional differences in NAGS across species.
To understand the evolutionary transition of NAGS allosteric regulation.
To investigate the role of NAGS in human hyperammonemia.

Main Methods:

Gene cloning and characterization of mammalian NAGS.
Structural analysis of NAGS domains.
Biochemical assays to determine enzyme kinetics and allosteric regulation.
Clinical data analysis for NAGS deficiency.

Main Results:

Mammalian NAGS features distinct N-terminal kinase and C-terminal transferase domains.
The kinase domain binds arginine, while the transferase domain contains the catalytic site.
NAGS deficiency in humans causes hyperammonemia, treatable with N-carbamylglutamate (NCG).

Conclusions:

The evolution of NAGS regulation is linked to tetrapod adaptation to land.
NCG effectively restores or enhances urea-cycle function in NAGS deficiency.
Understanding NAGS structure and function is critical for treating metabolic disorders.