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Saliva is a body fluid that holds promise for use as a diagnostic fluid for detecting diseases. Salivary proteins are known to be heavily glycosylated and are known to play functional roles in the oral cavity. We identified N-linked glycoproteins in human whole saliva, as well as the N-glycoproteins in parotid, submandibular, and sublingual glandular fluids.  MATERIALS AND METHODS: We employed hydrazide chemistry to affinity enrich for N-linked glycoproteins and glycopeptides. PNGase F releases the N-peptides/proteins from the agarose-hydrazide resin, and liquid chromatography-tandem mass spectrometry was used to identify the salivary N-glycoproteins.  RESULTS: A total of 156 formerly N-glycosylated peptides representing 77 unique N-glycoproteins were identified in salivary fluids. The total number of N-glycoproteins identified in the individual fluids was: 62, 34, 44, and 53 in whole saliva, parotid fluid, submandibular fluid, and sublingual fluid, respectively. The majority of the N-glycoproteins were annotated as extracellular proteins (40%), and several of the N-glycoproteins were annotated as membrane proteins (14%). A number of glycoproteins were differentially found in submandibular and sublingual glandular secretions.  CONCLUSIONS: Mapping the N-glycoproteome of parotid, submandibular, and sublingual saliva is important for a thorough understanding of biological processes occurring in the oral cavity and to realize the role of saliva in the overall health of human individuals. Moreover, identifying glycoproteins in saliva may also be valuable for future disease biomarker studies.

clinical proteomics

Comparison of N-linked Glycoproteins in Human Whole Saliva, Parotid, Submandibular, and Sublingual Glandular Secretions Identified using Hydrazide Chemistry and Mass Spectrometry