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Actinine (γ-Butyrobetaine) is an amino acid betaine aminobutyric acid zwitterion. Actinine acts as both a human metabolite and a metabolite of E. coli[1].

ChEBI: 4-(trimethylammonio)butanoate is an amino-acid betaine gamma-aminobutyric acid zwitterion in which all of the hydrogens attached to the nitrogen are replaced by methyl groups. It has a role as a human metabolite and an Escherichia coli metabolite. It is functionally related to a gamma-aminobutyrate and a gamma-aminobutyric acid zwitterion. It is a conjugate base of a 4-(trimethylammonio)butanoic acid.

[1] Koeth RA, et al. γ-Butyrobetaine is a proatherogenic intermediate in gut microbial metabolism of L-carnitine to TMAO. Cell Metab. 2014 Nov 4;20(5):799-812. DOI:10.1016/j.cmet.2014.10.006