Introduction
N-Acetyl-L-glutamic Acid (NAG) is a naturally occurring acetylated derivative of the amino acid L-glutamic acid. It serves as an essential allosteric activator in the mammalian urea cycle and is identified as a metabolite in both humans and yeast (e.g., Saccharomyces cerevisiae). This compound is valued in scientific research for its fundamental role in nitrogen metabolism and as a stable component in specialized cell culture media. Its high purity and well-defined structure also make it a critical building block in organic synthesis and a candidate for exploring novel applications in nutrition and personal care.
Physical & Chemical Parameters
| Parameter | Specification / Value | Notes / Significance |
|---|---|---|
| Melting Point | ~205-210 °C | Indicative of compound purity. |
| Specific Rotation [α]D | Data available upon request. | Key identifier for the L- enantiomer purity. |
| Solubility | Soluble in water (~25 mg/mL). Soluble in DMSO (100 mg/mL). | Facilitates use in aqueous buffers and biological assays. |
| pKa (Estimated) | ~3.9 (COOH), ~4.5 (COOH), ~9.8 (NH₂) | Relevant for formulation stability and ionization state in physiological pH. |
| Storage Conditions | Store at -20°C for long-term stability. Desiccate at room temperature for short-term. | Stable under recommended conditions. |
Mechanism of Action
NAG's most critical and well-defined role is as the obligatory allosteric activator of carbamoyl phosphate synthetase I (CPS I) in the mitochondrial matrix of hepatocytes. This mechanism is central to nitrogen disposal:
- Activation of CPS I: NAG binds to CPS I, dramatically increasing the enzyme's affinity for its substrate, ATP, and its activator, N-acetylglutamate synthase (NAGS). Without NAG, CPS I has minimal activity.
- Driving the Urea Cycle: Activated CPS I catalyzes the first committed and rate-limiting step of the urea cycle: the synthesis of carbamoyl phosphate from bicarbonate, ammonia (derived from amino acid catabolism), and ATP.
- Homeostatic Regulation: The synthesis of NAG itself by NAGS is stimulated by arginine, creating a feed-forward loop that links protein intake (arginine source) to the capacity for ammonia detoxification. This makes NAG a central regulatory nexus in maintaining nitrogen balance and preventing hyperammonemia.
Beyond this, NAG serves as a protected form of glutamic acid. The acetylation of the alpha-amino group enhances metabolic stability, making it a useful tool for studying glutamine/glutamate metabolism without rapid transamination or deamination.
Key Benefits & Advantages
- Critical Biochemical Regulator: Indispensable for fundamental research into the urea cycle, hyperammonemia disorders, and liver function.
- Enhanced Metabolic Stability: The N-acetyl group confers resistance to degradation by certain enzymes, making it a more stable alternative to free glutamic acid in specific experimental or formulation contexts.
- High Purity & Consistency: Available in research-grade high purity (≥98-99%), ensuring reliable and reproducible results in sensitive applications like cell culture and analytical standards.
- Versatile Research Tool: Serves as a precursor, metabolite, and biochemical probe in areas ranging from microbiology to mammalian cell metabolism.
- Building Block for Derivatives: The carboxylic acid groups and acetylated amine provide handles for chemical modification, enabling the synthesis of more complex compounds for various applications.
Primary Applications
| Industry / Field | Application Examples | Functional Role & Benefit |
|---|---|---|
| Biochemical & Biomedical Research | Study of urea cycle disorders, liver metabolism, and nitrogen balance. Enzyme kinetics (CPS I activation). | Serves as the essential cofactor to activate CPS I in vitro assays and mechanistic studies. |
| Cell Culture & Microbiology | Component of defined cell culture media, especially for specialized metabolic studies. Study of yeast and bacterial metabolism. | Acts as a stable source of glutamic acid/glutamine-related metabolites for cell growth and function. |
| Pharmaceutical Development | Intermediate in the synthesis of more complex pharmaceutical compounds. Potential investigative ingredient for metabolic supplements. | Used as a chiral synthon due to its defined stereochemistry and functional groups. |
| Cosmetic & Personal Care (Emerging) | Potential skin-conditioning agent and moisturizer, exploring derivatives like N-acylglutamines. | The glutamic acid moiety can contribute to skin hydration and barrier function. Note: Direct use of NAG is less common than its fatty acid conjugates (e.g., lauroyl glutamate). |
| Analytical Standards | Reference standard for HPLC, LC-MS, NMR in metabolomics, quality control, and clinical diagnostics. | Provides a pure, certified material for accurate quantification and identification. |
Formulation & Handling Reference
- Solubilization: For aqueous solutions, dissolve directly in water or buffer with mild sonication or stirring. For stock solutions in organic solvents, DMSO is suitable.
- Compatibility: Stable under mild acidic to neutral pH conditions. Avoid strong oxidizers and bases that may hydrolyze the amide bond.
- In-Use Stability: Prepare fresh solutions where possible. For storage, sterile-filter aqueous solutions and store at 4°C for short-term or -20°C for longer periods.
FAQ: Frequently Asked Questions
Q: What is the difference between N-Acetyl-L-glutamic Acid and N-Acetyl-L-glutamine?
A: They are distinct molecules. N-Acetyl-L-glutamic Acid has a free carboxyl group on its side chain and is central to the urea cycle. N-Acetyl-L-glutamine is the acetylated form of the amide glutamine. Their metabolic fates and primary biological functions differ significantly.
Q: Is N-Acetyl-L-glutamic Acid the same as the N-acylglutamates used in cosmetics?
A: No. In cosmetics, "N-acylglutamates" (like sodium lauroyl glutamate) refer to surfactants where the amino group of glutamic acid is linked to a fatty acid chain. NAG, with its short acetyl chain, is not a surfactant but may have other skin-conditioning properties.
Q: What is its role compared to N-Acetylglutamate Synthase (NAGS)?
A: NAGS is the enzyme that synthesizes NAG from acetyl-CoA and glutamate. NAGS deficiency is a cause of inherited hyperammonemia, treatable with drugs that can activate CPS I in place of the missing NAG.
Q: How is it different from N-Acetyl-D-glutamic Acid or the DL-mixture?
A: The "L-" designation specifies the stereochemistry found in natural amino acids and is biologically active in mammalian systems (e.g., activating CPS I). The "D-" enantiomer or the racemic "DL-" mixture typically has little to no activity in these pathways and is used for different chemical purposes. The CAS number for the DL-form is 5817-08-3.
Q: Is this product suitable for in vivo or human consumption?
A: The material supplied is for research and industrial use only. Any application in food, dietary supplements, or pharmaceuticals requires extensive safety testing, regulatory approval, and manufacture under appropriate Good Manufacturing Practice (GMP) guidelines.
Contact Us
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Contact our technical sales team today to:
- Request a free sample and a detailed Certificate of Analysis (CoA).
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