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PXD038280 is an original dataset announced via ProteomeXchange.

Dataset Summary
TitleLectin-based affinity enrichment and characterization of N-glycoproteins from the human tear film by mass spectrometry
DescriptionGlycosylation of proteins is one of the most common post-translational modification (PTM) and plays important regulatory functions in diverse biological processes such as protein stability or cell signaling. Accordingly, glycoproteins are also a consistent part of the human tear film proteome maintaining the proper function of the ocular surface and forming the first defense barrier of the ocular immune system. Irregularities in the glycoproteomic composition of the tear film might promote development of chronic eye diseases indicating glycoproteins as valuable source for biomarker discovery or drug target identification. The present study aimed to develop a lectin-based affinity method for the enrichment and concentration of tear glycoproteins/glycopeptides and the characterization of their specific N-glycosylation sites by high-resolution mass spectrometry (MS). For method development and evaluation, we accumulated first native glycoproteins from human tear sample pools and assessed the enrichment efficiency of different lectin column systems by 1D gel electrophoresis and specific protein stainings (Coomassie and glycoproteins). The best-performing multi-lectin column system (comprising the four lectins ConA, JAC, WGA and UEA I, termed as 4L) was applied for glycopeptide enrichment from human tear sample digests followed by MS-based detection and localization of their specific N-glycosylation sites. As main result, the present study identified in total 26 N glycosylation sites of 11 N-glycoproteins in tear sample pools of healthy individuals (n=3 biological sample pools). Amongst others, we identified tear film proteins lactotransferrin (N497 and N642, LTF), Ig heavy chain constant α-1 (N144 and 340, IGHA1), prolactin-inducible protein (N105, PIP) as well as extracellular lacritin (N105, LACRT) as highly reliable and significant N glycoproteins, which were already associated with the pathogenesis of various chronic eye diseases such as the dry eye syndrome (DES). In conclusion, the results of the present study will serve as important tear film N-glycoprotein catalogue for future studies focusing the human tear film and ocular surface-related inflammatory diseases.
ReviewLevelPeer-reviewed dataset
DatasetOriginOriginal dataset
RepositorySupportUnsupported dataset by repository
SpeciesList scientific name: Sus scrofa domesticus (domestic pig); NCBI TaxID: 9825; scientific name: Homo sapiens (Human); NCBI TaxID: 9606;
ModificationListacetylated residue; monohydroxylated residue; iodoacetamide derivatized residue
InstrumentLTQ Orbitrap
Dataset History
RevisionDatetimeStatusChangeLog Entry
02022-11-22 03:32:47ID requested
12023-01-25 07:24:41announced
Publication List
Schmelter C, Brueck A, Perumal N, Qu S, Pfeiffer N, Grus FH, Lectin-Based Affinity Enrichment and Characterization of N-Glycoproteins from Human Tear Film by Mass Spectrometry. Molecules, 28(2):(2023) [pubmed]
Keyword List
submitter keyword: N-glycoproteins, mass spectrometry, PNGase F, tear film, multi-lectin column
Contact List
Franz H.Grus
contact affiliationDepartment of Experimental and Translational Ophthalmology, University Medical Center, Johannes Gutenberg University, Mainz, Germany
contact emailgrus@eye-research.org
lab head
contact affiliationExperimental and Translational Ophthalmology, University Medical Care Centre Mainz
contact emailcarstenschmelter86@gmail.com
dataset submitter
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Dataset FTP location
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