Felinine

Biosynthesis

Felinine synthesis starts in the liver through a condensation reaction of glutathione and isopentenyl pyrophosphate to form 3-methylbutanolglutathionine (3-MBG).{{cite journal | doi-access = free}} Then, kidney epithelia tissue secretes γ-glutamyl transpeptidase (γ-GTP). γ-GTP converts 3-MBG to 3-methylbutanol-cysteinylglycine (MBCG). Next, a majority of MBCG is hydrolyzed to felinine and glycine by carboxylesterase 5A, or cauxin. Cauxin specifically works by hydrolyzing the dipeptide (felinylglycine) in MBCG to increase the concentration of urinary felinine.{{cite journal | doi-access=free

1. Glutathione + Isopentenyl Pyrophosphate → 3-MBG
2. 3-MBG + γ-GTP → MBCG

• MBCG + Cauxin → Felinine + Glycine, or
• MBCG → N-Acetylfelinine

Urine of domestic cats may contain a series of felinine-containing compounds including free felinine, acetylfelinine, felinylglycine and 3-MBG.{{cite journal

Cysteine also plays a role in the synthesis of felinine. For one, the amino acid is commonly present in many enzymes. Also, it is one of the few precursors for glutathione. Glutathione is converted to 3-MBG, and so cysteine has an important role in the early steps of synthesis.

1. Cysteine + Glycine + Glutamate → Glutathione

Uses

A precursor for mercaptan is 3-mercapto-3-methylbutanol (MMB). MMB is a chemical which gives a strong odor to cat urine. This smell is likely used for communicating amongst cats as well as scaring away predators and rivals. That is, the smell can mark their territory amongst other male cats and attract a female mate.

Felinine variables

Felinine excretion is regulated by levels of testosterone, and so its concentration is dependent on the sex and age of the cat. For instance, cats with high levels of testosterone produce higher levels of 3-MBG. Consequently, non neutered males have significantly higher concentrations of felinine in their urine than females and neutered males. Furthermore, cauxin is a carboxylesterase enzyme which hydrolyzes 3-methylbutanol-cysteinylglycine (MBCG) into felinine. Thus, felinine is dependent upon cauxin, and cauxin is excreted most in male cats above the age of three months. Therefore, older cats, compared to young kittens, have higher concentrations of felinine.

Also, long hair cats have less cysteine to go around as the amino acid is also used for protein structures found in hair. Thus, long-haired cats make less felinine than short-haired cats.

The urea in cat urine has been found to react with the felinine in the urine. After synthetic felinine was incubated in urea, none of it was recovered, suggesting a degradation or modification of felinine. However, evidence suggests that the interaction does not stem from a nucleophilic reaction.

It has been found that dietary supplementation with amino acids other than cysteine impact felinine excretion. This is most likely caused by the presence of arginine, which is believed to inhibit synthesis of MBG, which decreases felinine excretion.

References

References

1. Discovery of felinine: Westall, R. G. "Amino acids and other ampholytes of urine. II. Isolation of a new sulfur-containing amino acid from cat urine" Biochemical Journal (1953), 55, 244-8.
2. P. David Josephy. (28 January 2006). "Molecular Toxicology". Oxford University.
3. (January 2018). "LC–MS/MS quantification of felinine metabolites in tissues, fluids, and excretions from the domestic cat (Felis catus)". Journal of Chromatography B.
4. (July 2001). "Importance of sulfate, cysteine and methionine as precursors to felinine synthesis by domestic cats (Felis catus)". Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology.
5. (January 2018). "LC–MS/MS quantification of felinine metabolites in tissues, fluids, and excretions from the domestic cat (Felis catus)". Journal of Chromatography B.
6. (October 2006). "A Major Urinary Protein of the Domestic Cat Regulates the Production of Felinine, a Putative Pheromone Precursor". Chemistry & Biology.
7. (October 2006). "A Major Urinary Protein of the Domestic Cat Regulates the Production of Felinine, a Putative Pheromone Precursor". Chemistry & Biology.
8. (June 2014). "Felinine excretion in domestic cat breeds: a preliminary investigation". Journal of Animal Physiology and Animal Nutrition.
9. (2007-07-31). "Felinine stability in the presence of selected urine compounds". Amino Acids.
10. (2008-10-08). "Urinary felinine excretion in intact male cats is increased by dietary cystine". The British Journal of Nutrition.