Glycine Conjugation Pathway in Xenobiotic Metabolism
Summary
The glycine conjugation pathway represents a crucial phase II detoxification mechanism by which the body neutralises and eliminates a broad array of xenobiotic acyl‐CoA intermediates. Within hepatic mitochondria, activated acyl groups derived from aromatic and aliphatic acids are transferred to glycine, forming stable N‐acylglycine conjugates. This process not only increases water solubility for renal excretion but also prevents accumulation of potentially cytotoxic acyl‐CoA species. The principal enzyme family responsible, glycine N‐acyltransferases, exhibits distinct substrate specificities that reflect variations in both endogenous metabolism and exposure to environmental chemicals. Common end products include hippuric acid from benzoate and phenylacetylglycine from phenylacetate, each serving as biomarkers of pathway activity. Beyond hepatic clearance, emerging evidence connects glycine conjugation to microbiome‐derived metabolites, emphasising its systemic and ecological significance. Clinically, defects in this route manifest in inherited metabolic disorders and influence the pharmacokinetics of therapeutic agents, underlining its global importance in toxicology and personalised medicine.
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Glycine Conjugation Pathway in Xenobiotic Metabolism publication trend
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Technical terms
Xenobiotic: a chemical compound foreign to the body, including drugs, pollutants and dietary additives.
Glycine conjugation: a phase II metabolic process in which acyl‐CoA intermediates are enzymatically linked to glycine, forming water‐soluble conjugates.
Acyl‐CoA: a thioester intermediate generated by coupling an organic acid to coenzyme A, serving as a substrate for conjugation and energy metabolism.
Glycine N‐acyltransferase: an enzyme that catalyses the transfer of acyl groups from acyl‐CoA to glycine, yielding N‐acylglycine products for excretion.
Hippuric acid: the glycine conjugate of benzoic acid, commonly measured in urine as an indicator of glycine conjugation pathway activity.
References
- THE CONJUGATION OF BENZOIC ACID IN MAN. Journal of Biological Chemistry (1931).
- The Isolation and Identification of N-Isovalerylglycine from Urine of Patients with Isovaleric Acidemia. Journal of Biological Chemistry (1967).
- Benzoyl-coenzyme A:glycine N-acyltransferase and phenylacetyl-coenzyme A:glycine N-acyltransferase from bovine liver mitochondria. Purification and characterization.. Journal of Biological Chemistry (1979).
- Molecular Cloning and Characterization of a Novel Human Glycine-N-acyltransferase Gene GLYATL1, Which Activates Transcriptional Activity of HSE Pathway. International Journal of Molecular Sciences (2007).
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