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Biantennary Glycans as Well as Genetic Variants of α1-Acid Glycoprotein Control the Enantioselectivity and Binding Affinity of Oxybutynin

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Purpose

The purpose of this study was to investigate the role of biantennary branching glycans of α1-acid glycoprotein (AGP) and its genetic variants in the enantioselective binding of oxybutynin (OXY).

Method

Human native AGP was separated using imminodiacetate–copper (II) affinity chromatography into two fractions, the A variant and a mixture of the F1 and S variants (F1–S). These fractionated AGPs were further separated by concanavalin A affinity chromatography into two fractions, with and without biantenarry glycans. An on-line high-performance liquid chromatography (HPLC) system consisting of a high-performance frontal analysis column, an extraction column, and an analytical HPLC column was developed to determine the binding affinities of OXY enantiomers for respective AGP species.

Results

The total binding affinity as well as the enantiomeric selectivity of OXY in the F1–S mixed variant was significantly higher than that for the A variant, indicating that the chiral recognition ability of native AGP for the OXY enantiomers highly depends on the F1–S mixed variant. Furthermore, not only the genetic variants but also bianntenary glycans of AGP affect the binding affinity of OXY and are also responsible for the enantioselectivity.

Conclusions

Both genetic variants and glycan structures significantly contribute to the enantioselectivity and the binding affinity of OXY.

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Acknowledgments

The authors wish to acknowledge the advice provided by Professor Terumichi Nakagawa (Setsunan University, Japan). The authors also thank Professor Irving W. Wainer (National Insitute on Aging, U.S.A.) for providing samples. This research was supported by the 21st Century Center of Excellence Program “Knowledge Information Infrastructure for Genome Science” from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan

    Tomoko Kimura & Katsumi Matsuzaki

  2. Faculty of Pharmaceutical Sciences, Chiba Institute of Science, Chosi, 288-0025, Japan

    Akimasa Shibukawa

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  1. Tomoko Kimura
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  2. Akimasa Shibukawa
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  3. Katsumi Matsuzaki
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Correspondence to Katsumi Matsuzaki.

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Kimura, T., Shibukawa, A. & Matsuzaki, K. Biantennary Glycans as Well as Genetic Variants of α1-Acid Glycoprotein Control the Enantioselectivity and Binding Affinity of Oxybutynin. Pharm Res 23, 1038–1042 (2006). https://doi.org/10.1007/s11095-006-9777-8

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