Although initial reports suggested meldonium is a non-competitive and non-hydroxylatable analogue of gamma-butyrobetaine; further studies have identified that meldonium is a substrate for gamma-butyrobetaine dioxygenase. X-ray crystallographic and in vitro biochemical studies suggest that meldonium binds to the substrate pocket of γ-butyrobetaine hydroxylase and acts as an alternative substrate, and therefore a competitive inhibitor. Normally, this enzyme's action on its substrates γ-butyrobetaine and 2-oxoglutarate gives, in the presence of the further substrate oxygen, the products L-carnitine, succinate, and carbon dioxide; in the presence of this alternate substrate, the reaction yields malonic acid semialdehyde, formaldehyde (akin to the action of histone demethylases), dimethylamine, and (1-methylimidazolidin-4-yl)acetic acid, "an unexpected product with an additional carbon-carbon bond resulting from N-demethylation coupled to oxidative rearrangement, likely via an unusual radical mechanism." The unusual mechanism is thought likely to involve a Steven's type rearrangement.
Meldonium's inhibition of γ-butyrobetaine hydroxylase gives a half maximal inhibitory concentration (IC50) value of 62 micromolar, which other study authors have described as "potent." Meldonium is an example of an inhibitor that acts as a non-peptidyl substrate mimic.
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