TY  - JOUR
A1  - Paragas, Erickson M.
A1  - Humphreys, Sara C.
A1  - Min, Joshua
A1  - Joswig-Jones, Carolyn A.
A1  - Leimkühler, Silke
A1  - Jones, Jeffrey P.
T1  - ecoAO
BT  - a simple system for the study of human aldehyde oxidases role in drug metabolism
JF  - ACS OMEGA
N2  - Although aldehyde oxidase (AO) is an important hepatic drug-metabolizing enzyme, it remains understudied and is consequently often overlooked in preclinical studies, an oversight that has resulted in the failure of multiple clinical trials. AO’s preclusion to investigation stems from the following: (1) difficulties synthesizing metabolic standards due to the chemospecificity and regiospecificity of the enzyme and (2) significant inherent variability across existing in vitro systems including liver cytosol, S9 fractions, and primary hepatocytes, which lack specificity and generate discordant expression and activity profiles. Here, we describe a practical bacterial biotransformation system, ecoAO, addressing both issues simultaneously. ecoAO is a cell paste of MoCo-producing Escherichia coli strain TP1017 expressing human AO. It exhibits specific activity toward known substrates, zoniporide, 4-trans-(N,N-dimethylamino)cinnamaldehyde, O6-benzylguanine, and zaleplon; it also has utility as a biocatalyst, yielding milligram quantities of synthetically challenging metabolite standards such as 2-oxo-zoniporide. Moreover, ecoAO enables routine determination of kcat and V/K, which are essential parameters for accurate in vivo clearance predictions. Furthermore, ecoAO has potential as a preclinical in vitro screening tool for AO activity, as demonstrated by its metabolism of 3-aminoquinoline, a previously uncharacterized substrate. ecoAO promises to provide easy access to metabolites with the potential to improve pharmacokinetic clearance predictions and guide drug development.
Y1  - 2017
U6  - https://doi.org/10.1021/acsomega.7b01054
SN  - 2470-1343
VL  - 2
SP  - 4820
EP  - 4827
PB  - American Chemical Society
CY  - Washington
ER  -