Abstract
A new polymeric (methyl methacrylate/ethylene glycol dimethacrylate/1,2-epoxy-5-hexene) base/matrix has been fabricated and decorated with zwitterionic hydrophilic cysteic acid (Cya) for the enrichment of intact N-glycopeptides from standards and biological samples. Terpolymer-Cya provides good enrichment efficiency, improved hydrophilicity, and selectivity by virtue of better surface area (2.09 × 102 m2/g) provided by terpolymer and the zwitterionic property offered by cysteic acid. Cysteic acid-functionalized polymeric hydrophilic interaction liquid chromatography (HILIC) sorbent enriches 35 and 24 N-linked glycopeptides via SPE (solid phase extraction) mode from tryptic digests of model glycoproteins, i.e., immunoglobulin G (IgG) and horseradish peroxidase (HRP), respectively. Zwitterionic chemistry of cysteine helps in achieving higher selectivity with BSA digest (1:200), and lower detection limit down to 100 attomoles with a complete glycosylation profile of each standard digest. The recovery of 81% and good reproducibility define the application of terpolymer-Cya for complex samples like a serum. Analysis of human serum provides a profile of 807 intact N-linked glycopeptides via nano-liquid chromatography-tandem mass spectrometry (nLC-MS/MS). To the best of our knowledge, this is the highest number of glycopeptides enriched by any HILIC sorbent. Selected glycoproteins are evaluated in link to various cancers including the breast, lung, uterine, and melanoma using single-nucleotide variances (BioMuta). This study represents the complete idea of using an in-house developed strategy as a successful tool to help analyze, relate, and answer glycoprotein-based clinical issues regarding cancers.
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Data is available via the Proteome Xchange with identifier PXD030890.
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This work is supported by the National Institute of General Medical Sciences and the National Cancer Institute of the National Institutes of Health under Award Numbers R35GM141944 and U01CA185188.
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Additional information includes the Digestion protocols; Sample preparations; Characterizations (IR, and EDX); Selectivity, sensitivity, and reproducibility MALDI-MS spectra; MS/MS spectra and tables.
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Sajid, M.S., Saleem, S., Jabeen, F. et al. Terpolymeric platform with enhanced hydrophilicity via cysteic acid for serum intact glycopeptide analysis. Microchim Acta 189, 277 (2022). https://doi.org/10.1007/s00604-022-05343-0
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DOI: https://doi.org/10.1007/s00604-022-05343-0