Absolute Quantification of Human Uridine-Diphosphate Glucuronosyl Transferase (UGT) Enzyme Isoforms 1A1 and 1A6 By Tandem LC-MS

Title: Absolute Quantification of Human Uridine-Diphosphate Glucuronosyl Transferase (UGT) Enzyme Isoforms 1A1 and 1A6 By Tandem LC-MS

Volume: 2 Issue: 3

Author(s): John K. Fallon, David E. Harbourt, Saber H. Maleki, Fay K. Kessler, Joseph K. Ritter and Philip C. Smith

Affiliation:

Keywords: LC-MS/MS, UGT, triple quadrupole, absolute quantification, quantitative proteomics, stable isotope labeled synthetic peptides

Abstract: UGT enzymes catalyze the formation of glucuronic acid conjugates. Specifically selected representative stable isotope (C13, N15) labeled peptide internal standards of each enzyme were employed to quantify UGTs 1A1 and 1A6 by LC-MS/MS using isotope dilution techniques. Inter-day variability (n=5) for human liver microsomes was 8.0 % for UGT1A1 and 19 % for UGT1A6. Comparison within a human liver microsomal library showed a strong correlation with Western blot for UGT1A1 concentrations (r=0.988). The data presented indicates that an accurate and reproducible method for UGT absolute quantification can be established using LC-MS/MS analysis of characteristic peptides within the protein.

Cite this article as:

Fallon K. John, Harbourt E. David, Maleki H. Saber, Kessler K. Fay, Ritter K. Joseph and Smith C. Philip, Absolute Quantification of Human Uridine-Diphosphate Glucuronosyl Transferase (UGT) Enzyme Isoforms 1A1 and 1A6 By Tandem LC-MS, Drug Metabolism Letters 2008; 2 (3) . https://dx.doi.org/10.2174/187231208785425764