Effect of human flavin-containing monooxygenase 3 polymorphism on the metabolism of aurora kinase inhibitors.
Aurora kinases were recently identified as a potential target in anticancer therapy and, amongst their available inhibitors, Tozasertib (VX-680) and Danusertib  (PHA-739358) have been indicated as possible substrates of human flavin-containing monooxygenase 3 (hFMO3). Here we report the in vitro rate of oxidation of these drugs by wild-type hFMO3 and its polymorphic variant V257M. The conversion of Tozasertib and Danusertib to their corresponding metabolites, identified by LC-MS, by the purified  wild-type and V257M hFMO3 show significant differences. In the case of Tozasertib, the V257M variant shows a catalytic efficiency, expressed as k(cat)/K(m), similar to the wild-type: 0.39 ± 0.06 min-1µM-1 for V257M compared to 0.33 ± 0.04 min-1µM-1 for the wild type. On the other hand, in the case of Danusertib, V257M shows a 3.4× decrease in  catalytic efficiency with k(cat)/K(m) values of 0.05 ± 0.01 min-1µM-1 for V257M and  0.17 ± 0.03 min-1µM-1 for the wild type. These data reveal how a simple V257M substitution ascribed to a single nucleotide polymorphism affects the N-oxidation of relevant anticancer drugs, with important outcome in their therapeutic effects. These findings demonstrate that codon 257 is important for activity of the hFMO3 gene and the codon change V to M has an effect on the catalytic efficiency of this enzyme.
Department of Life Sciences and Systems Biology, University of Torino, Via Accademia Albertina 13, Torino 10123, Italy. sheila.sadeghi@unito.it.
Gianluca
G
Catucci
Andrea
A
Occhipinti
Massimo
M
Maffei
Gianfranco
G
Gilardi
Sheila J
SJ
Sadeghi