Abstract
Glycation (or non-enzymatic glycosylation) is a common non-enzymatic covalent modification of human proteins. Glucose, the highest concentrated monosaccharide in blood, can reversibly react with amino groups of proteins to form Schiff bases that can rearrange to form relatively stable Amadori products. These can be further oxidized to advanced glycation end products (AGEs). Here, we analyzed the glycation patterns of human serum albumin (HSA) in plasma samples obtained from five patients with type 2 diabetes mellitus. Therefore, glycated peptides from a tryptic digest of plasma were enriched with m-aminophenylboronic acid (mAPBA) affinity chromatography. The glycated peptides were then further separated in the second dimension by RP-HPLC coupled on-line to an electrospray ionization (ESI) tandem mass spectrometer (MS/MS). Altogether, 18 Amadori peptides, encompassing 40% of the HSA sequence, were identified. The majority of the peptides were detected and relatively quantified in all five samples with a high reproducibility among the replicas. Eleven Lys-residues were glycated at similar quantities in all samples, with glycation site Lys549 (KAm(Glc)QTALVELVK) being the most abundant. In conclusion, the established mAPBA/nanoRP-HPLC-ESI-MS/MS approach could reproducibly identify and quantify glycation sites in plasma samples, potentially useful in diagnosis and therapeutic control.
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Abbreviations
- AGE:
-
advanced glycation end product
- CID:
-
collision-induced dissociation
- CEL:
-
Nε-carboxyethyllysine
- CML:
-
Nε-carboxymethyllysine
- 2D-LC:
-
two-dimensional liquid chromatography
- DTT:
-
dithiothreitol
- ESI:
-
electrospray ionization
- glycBSA:
-
glycated bovine serum albumin
- HbA1c :
-
glycated hemoglobin fraction
- HSA:
-
human serum albumin
- IDA:
-
information-dependent acquisition
- MALDI:
-
matrix-assisted laser desorption/ionization
- mAPBA:
-
m-aminophenylboronic acid
- MS:
-
mass spectrometry
- MS/MS:
-
tandem mass spectrometry
- SDS-PAGE:
-
polyacrylamide gel electrophoresis with sodium dodecyl sulfate
- QqTOF:
-
quadrupole time-of-flight
- RPC:
-
reversed-phase chromatography
- RP-HPLC:
-
reversed-phase high-performance liquid chromatography
- TIC:
-
total ion current
- XIC:
-
extracted ion chromatogram
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Acknowledgements
We thank Dr. Bernd Gründig for providing blood samples and Nicole Herth and Dr. Daniela Volke for preparation of the plasma samples. Financial support by the Deutsche Forschungsgemeinschaft (DFG, Graduiertenkolleg 378), the Free State Saxony and a scholarship of the DFG to A.F. are gratefully acknowledged.
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Frolov, A., Hoffmann, R. Identification and relative quantification of specific glycation sites in human serum albumin. Anal Bioanal Chem 397, 2349–2356 (2010). https://doi.org/10.1007/s00216-010-3810-9
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DOI: https://doi.org/10.1007/s00216-010-3810-9