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The aim of the study was to analyze the ability of the microorganism Cunninghamella to carry out the biotransformation of 1-[3-(4-tert-butylphenoxy)propyl]piperidine (DL76) and to compare the obtained results with in silico models. Biotransformation was carried out by three strains of filamentous fungus: Cunninghamella echinulata, Cunninghamella blakesleeana, and Cunninghamella elegans. Most probable direction of DL76 metabolic transition was the oxidation of the methyl group in the tert-butyl moiety leading to the formation of the metabolite with I° alcohol properties. This kind of reaction was conducted by all three strains tested. However, only in the case of C. blakesleeana that biotransformation product had a structure of carboxylic acid. CYP2C19 was identified by Metasite software to be the isoform of major importance in the oxidation process in the tert-butyl moiety of DL76. In silico data coincide with the results of experiments conducted in vitro. It was confirmed that Cunninghamella fungi are a very good model to study the metabolism of xenobiotics. The computational methods and microbial models of metabolism can be used as useful tools in early ADME-Tox assays in the process of developing new drug candidates.

Cunninghamella as a Microbiological Model for Metabolism of Histamine H3 Receptor Antagonist 1-[3-(4-tert-Butylphenoxy)propyl]piperidine