Reagent-free LC-MS/MS-based pharmacokinetic quantification of polyhistidine-tagged therapeutic proteins
Jianxia Shi1, Jing Man Wong1, Ji Ma1
1Department of Pharmacokinetics & Drug Metabolism, Amgen Inc., South San Francisco, CA 94080, USA.
Aim:
Immobilized metal ion affinity chromatography is widely employed for purifying polyhistidine-tagged recombinant proteins from cell lysates. The technique can be applied for quantification of therapeutic proteins in biological matrices by LC-MS/MS.
Results:
A protein reagent-free workflow was developed for quantifying polyhistidine-tagged proteins by LC-MS/MS. The workflow includes target protein enrichment by immobilized metal ion affinity chromatography, on-bead trypsin digestion and quantification of signature peptides by LC-MS/MS. It was applied to quantify a 6×His-tagged protein in a mouse pharmacokinetic study with assay sensitivity of 10.0 ng/ml and linearity up to 10,000 ng/ml.
Conclusion:
The protein reagent-free workflow developed herein can overcome reagent limitation and serve as a viable approach for quantifying polyhistidine-tagged therapeutic proteins to support discovery pharmacokinetic and pharmacodynamic studies.
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