Determination of N-Glycosylation Sites and Site Heterogeneity in Glycoproteins

Hyun Joo An, Thomas R. Peavy, Jerry L. Hedrick, Carlito B Lebrilla

Research output: Contribution to journalArticle

206 Citations (Scopus)

Abstract

An approach for the characterization of glycosylation sites and oligosaccharide heterogeneity in glycoproteins based on a combination of nonspecific proteolysis, deglycosylation, and matrix-assisted laser desorption/ionization Fourier transform mass spectrometry (MALDI-FT MS) is described. Glycoproteins were digested with Pronase yielding primarily glycopeptides and amino acids. Nonglycosylated peptide fragments were susceptible to complete Pronase digestion to their constituent amino acids. Steric hindrance prohibited the digestion of the peptide moiety attached to the glycan. Glycopeptides were desalted and concentrated using solid-phase extraction and analyzed by MALDI MS. The oligosaccharides were also analyzed by MALDI MS after releasing the glycans from glycoproteins using PNGase F. The peptide moiety of the glycopeptides was identified by subtracting the masses of the glycans derived from PNGase F treatment from the masses of the glycopeptides. The experimental strategy was validated using glycoproteins with known oligosaccharide structures, ribonuclease B and chicken ovalbumin. This procedure was then used to determine the N-glycosylation sites and site heterogeneity of a glycoprotein whose glycosylation pattern was unknown, namely, the Xenopus laevis egg cortical granule lectin. This procedure is useful for determining protein site heterogeneity and structural heterogeneities of the oligosaccharide moiety of glycoproteins.

Original languageEnglish (US)
Pages (from-to)5628-5637
Number of pages10
JournalAnalytical Chemistry
Volume75
Issue number20
DOIs
StatePublished - Oct 15 2003

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Glycosylation
Glycoproteins
Glycopeptides
Oligosaccharides
Peptide-N4-(N-acetyl-beta-glucosaminyl) Asparagine Amidase
Polysaccharides
Pronase
Proteolysis
Amino Acids
Peptide Fragments
Ovalbumin
Lectins
Ionization
Mass spectrometry
Desorption
Fourier transforms
Peptides
Lasers
Proteins

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

An, H. J., Peavy, T. R., Hedrick, J. L., & Lebrilla, C. B. (2003). Determination of N-Glycosylation Sites and Site Heterogeneity in Glycoproteins. Analytical Chemistry, 75(20), 5628-5637. https://doi.org/10.1021/ac034414x

Determination of N-Glycosylation Sites and Site Heterogeneity in Glycoproteins. / An, Hyun Joo; Peavy, Thomas R.; Hedrick, Jerry L.; Lebrilla, Carlito B.

In: Analytical Chemistry, Vol. 75, No. 20, 15.10.2003, p. 5628-5637.

Research output: Contribution to journalArticle

An, HJ, Peavy, TR, Hedrick, JL & Lebrilla, CB 2003, 'Determination of N-Glycosylation Sites and Site Heterogeneity in Glycoproteins', Analytical Chemistry, vol. 75, no. 20, pp. 5628-5637. https://doi.org/10.1021/ac034414x
An, Hyun Joo ; Peavy, Thomas R. ; Hedrick, Jerry L. ; Lebrilla, Carlito B. / Determination of N-Glycosylation Sites and Site Heterogeneity in Glycoproteins. In: Analytical Chemistry. 2003 ; Vol. 75, No. 20. pp. 5628-5637.
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