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- Title
Comparative Analysis of Site-Specific N-glycosylation of LAMP1 from Breast Cancer Tissues.
- Authors
Ohashi, Shoko; Takakura, Daisuke; Kobayashi, Noritoshi; Tokuhisa, Motohiko; Ichikawa, Yasushi; Kawasaki, Nana
- Abstract
Glycosylation changes in cancer proteins have been associated with malignant transformation. However, techniques for analyzing site-specific glycosylation changes in target proteins obtained from clinical tissue samples are insufficient. To overcome these problems, we developed a targeted N-glycoproteomic approach consisting of immunoprecipitation, glycopeptide enrichment, LC/MS/MS and structural assignment using commercially available analytical software followed by manual confirmation. This approach was applied to the comparative site-specific glycosylation analysis of lysosome-associated membrane glycoprotein 1 (LAMP1) between breast cancer (BC) tumors and normal tissues adjacent to tumors. Extensive determination of glycan heterogeneity from four N-glycosylation sites (Asn84/103/249/261) in LAMP1 identified 262 glycoforms and revealed remarkable diversity in tumor glycan structures. A significant increase in N-glycoforms with multiple fucoses and sialic acids at Asn84/249 and high-mannose-type glycans at Asn103/261 were observed in the tumor. Principal component analysis revealed that tumors of different subtypes have independent distributions. This approach enables site-specific glycopeptide analysis of target glycoprotein in breast cancer tissue and become a powerful tool for characterizing tumors with different pathological features by their glycan profiles.
- Subjects
MICROSOFT Corp.; GLYCANS; BREAST cancer; GLYCAN structure; PRINCIPAL components analysis; SIALIC acids; GLYCOPROTEIN analysis
- Publication
Journal of Biochemistry, 2024, Vol 175, Issue 5, p561
- ISSN
0021-924X
- Publication type
Article
- DOI
10.1093/jb/mvae001