Annotation of a serum N-Glycan library for rapid identification of structures

Danielle Aldredge, Hyun Joo An, Ning Tang, Keith Waddell, Carlito B Lebrilla

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


Glycosylation is one of the most common post-translational modifications of proteins and has been shown to change with various pathological states including cancer. Global glycan profiling of human serum based on mass spectrometry has already led to several promising markers for diseases. The changes in glycan structure can result in altered monosaccharide composition as well as in the linkages between the monosaccharides. High-throughput glycan structural elucidation is not possible because of the lack of a glycan template to expedite identification. In an effort toward rapid profiling and identification of glycans, we have constructed a library of structures for the serum glycome to aid in the rapid identification of serum glycans. N-Glycans from human serum glycoproteins are used as a standard and compiled into a library with exact structure (composition and linkage), liquid chromatography retention time, and accurate mass. Development of the library relies on highly reproducible nanoLC-MS retention times. Tandem MS and exoglycosidase digestions were used for structural elucidation. The library currently contains over 300 entries with 50 structures completely elucidated and over 60 partially elucidated structures. This database is steadily growing and will be used to rapidly identify glycans in unknown biological samples.

Original languageEnglish (US)
Pages (from-to)1958-1968
Number of pages11
JournalJournal of Proteome Research
Issue number3
StatePublished - Mar 2 2012


  • database/library
  • glycan structures
  • isomers
  • N-linked glycan
  • nano HPLC-Chip TOF MS
  • online detection
  • retention time

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)


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