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2,3-dihydrothieno-Thiadiazole Carboxylate is a CYP450 (CYP2E1 and CYP2B4) inhibitor.

The cytochrome P450 (CYP) enzymes are a superfamily of oxidative catalysts critical in the biosynthesis and metabolism of various endobiotics such as steroids and steroid hormones, the neurotransmitter nitric oxide, and vitamins A and D. The cytochrome P450 enzymes are also involved in the metabolism of xenobiotics including natural products, drugs, and other organic chemicals.

In vitro: As a 1,2,3-thiadiazole analog, 2,3-dihydrothieno-thiadiazole carboxylate could both inhibit and inactivate certain microsomal CYP450 enzymes (CYP2E1 and CYP2B4) at 100 μM, but not others (CYP1A2). Moreover, P450 2E1 was significantly more sensitive than P450 2B4 to mechanism-based inactivation by 2,3-dihydrothieno-thiadiazole carboxylate when compared by the difference in partition numbers and inactivation rate constants. Inactivation rate constants (kinact) determined from plots of 1/kobs versus 1/[I] were 0.08 for 2E1 and 0.04 min-1 for P450 2B4, with Kis of 0.1 and 2.0 mM, respectively. The difference in the oxidation of the monocyclic and bicyclic thaidiazoles might account for the ability of 2,3-dihydrothieno-thiadiazole carboxylate to function as a mechanism-based inactivator [1].

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