Determining site occupancy of acetaminophen covalent binding to target proteins in vitro

Geib, Timon, Lento, Cristina, Marensi, Vanessa ORCID: 0000-0002-4898-194X, Thulasingam, Madhuranayaki, Haeggström, Jesper Z, Olsson, Magnus, Wilson, Derek J, Leslie, Elaine M and Sleno, Lekha (2021) Determining site occupancy of acetaminophen covalent binding to target proteins in vitro. Analytical Science Advances, 2 (5-6). pp. 263-271.

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Official URL: http://dx.doi.org/10.1002/ansa.202000182

Abstract

<jats:title>Abstract</jats:title><jats:p>Acetaminophen (APAP)‐related toxicity is caused by the formation of <jats:italic>N</jats:italic>‐acetyl <jats:italic>p</jats:italic>‐benzoquinone imine (NAPQI), a reactive metabolite able to covalently bind to protein thiols. A targeted liquid chromatography‐tandem mass spectrometry (LC‐MS/MS) method, using multiple reaction monitoring (MRM), was developed to measure APAP binding on selected target proteins, including glutathione <jats:italic>S</jats:italic>‐transferases (GSTs). In vitro incubations with CYP3A4 were performed to form APAP in the presence of different proteins, including four purified GST isozymes. A custom alkylation agent was used to prepare heavy labeled modified protein containing a structural isomer of APAP on all cysteine residues for isotope dilution. APAP incubations were spiked with heavy labeled protein, digested with either trypsin or pepsin, followed by peptide fractionation by HPLC prior to LC‐MRM analysis. Relative site occupancy on the protein‐level was used for comparing levels of modification of different sites in target proteins, after validation of protein and peptide‐level relative quantitation using human serum albumin as a model system. In total, seven modification sites were quantified, namely Cys115 and 174 in GSTM2, Cys15, 48 and 170 in GSTP1, and Cys50 in human MGST1 and rat MGST1. In addition, APAP site occupancies of three proteins from liver microsomes were also quantified by using heavily labeled microsomes spiked into APAP microsomal incubations. A novel approach employing an isotope‐labeled alkylation reagent was used to determine site occupancies on multiple protein thiols.</jats:p>

Item Type:	Article
Uncontrolled Keywords:	acetaminophen, glutathione S-transferase, multiple reaction monitoring, N-acetyl p-benzoquinone imine, protein covalent binding, protein modifications, reactive metabolite, site occupancy
Divisions:	Faculty of Health and Life Sciences Faculty of Health and Life Sciences > Institute of Systems, Molecular and Integrative Biology
Depositing User:	Symplectic Admin
Date Deposited:	18 May 2022 09:16
Last Modified:	24 Oct 2023 18:48
DOI:	10.1002/ansa.202000182
Open Access URL:	https://doi.org/10.1002/ansa.202000182
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3155026