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In-Depth Comparative Characterization of Hemoglobin Glycation in Normal and Diabetic Bloods by LC-MSMS

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Journal of The American Society for Mass Spectrometry

Abstract

The glycation level at β-Val-1 of the hemoglobin β chain in human blood (HbA1c%) is used to diagnose diabetes and other diseases. However, hemoglobin glycation occurs on multiple sites on different isoforms with different kinetics, but its differential profile has not been clearly demonstrated. In this study, hemoglobin was extracted from the blood of normal and diabetic individuals by protein precipitation. Triplicate solutions prepared from each sample were directly analyzed or digested with multiple enzymes and then analyzed by nano-LC/MS via bottom-up approach for side-by-side characterization. Intact hemoglobin analysis indicated a single glucose-dominant glycation, which showed good correlation with the HbA1c% values. Moreover, full sequence (100 %) of α/β globin was mapped and seven glycation sites were unambiguously assigned. In addition to β-Val-1, two other major sites at α-Lys-61 and β-Lys-66, which contain the common sequence HGKK, and four minor sites (<1 %) on α-Val-1, β-Lys-132, α-Lys-127, and α-Lys-40 were identified. All sites were shown to exhibit similar patterns of site distribution despite different glucose levels. Both the intact mass measurement and bottom-up data consistently indicated that the total glycation percentage of the β-globin was twice higher than the α-globin. Using molecular modeling, the 3D structure of the consensus sequence (HGKK) was shown to contain a phosphate triangle cavity, which helps to catalyze the glycation reaction. For the first time, hemoglobin glycation in normal and diabetic bloods was comparatively characterized in-depth with 100 % sequence coverage. The results provide insight about the HbA1c parameter and help define the new and old markers.

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Acknowledgment

The authors acknowledge support for this work by the National Science Council in Taiwan (NSC 102-2113-M-006-005-MY3).

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Authors and Affiliations

  1. Department of Chemistry, National Cheng Kung University, Tainan, 701, Taiwan

    Shih-Hao Wang, Tzu-Fan Wang & Shu-Hui Chen

  2. Department of Family Medicine, College of Medicine, National Cheng Kung University Hospital, Tainan City, Taiwan

    Chih-Hsing Wu

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  1. Shih-Hao Wang
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Correspondence to Shu-Hui Chen.

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Wang, SH., Wang, TF., Wu, CH. et al. In-Depth Comparative Characterization of Hemoglobin Glycation in Normal and Diabetic Bloods by LC-MSMS. J. Am. Soc. Mass Spectrom. 25, 758–766 (2014). https://doi.org/10.1007/s13361-014-0830-2

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  • DOI: https://doi.org/10.1007/s13361-014-0830-2

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