Abstract
Unlike nuclear nucleolin, surface-expressed and cytoplasmic nucleolin exhibit Tn antigen. Here, we show localization-dependent differences in the glycosylation and proteolysis patterns of nucleolin. Our results provide evidence for different paths of nucleolin proteolysis in the nucleus, in the cytoplasm, and on the cell surface. We found that full-length nucleolin and some proteolytic fragments coexist within live cells and are not solely the result of the preparation procedure. Extranuclear nucleolin undergoes N- and O-glycosylation, and unlike cytoplasmic nucleolin, membrane-associated nucleolin is not fucosylated. Here, we show for the first time that nucleolin and endogenous galectin-3 exist in the same complexes in the nucleolus, the cytoplasm, and on the cell surface of melanoma cells. Assessments of the interaction of nucleolin with galectin-3 revealed nucleolar co-localization in interphase, suggesting that galectin-3 may be involved in DNA organization and ribosome biogenesis.
Electronic Supplementary Material
Supplementary material is available for this article at 10.2478/s11658-014-0206-4 and is accessible for authorized users.
Keywords: Glycosylation of nucleolin, Galectin-3, Melanoma, Mass spectrometry, Confocal microscopy, Lectin assay, Co-immunoprecipitation
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Abbreviations used
- AAA
Aleuria aurantia agglutinin
- DSA
Datura stramonium gglutinin
- GNA
Galanthus nivalis agglutinin
- H antigen
Fucα1-2Galβ1-4GlcNAcβ1-3Gal-
- LEA
Lycopersicon esculentum agglutinin
- Lex
Galβ1-4(Fucα1-3)GlcNAcβ-
- LTA
Tetragonolobus purpureus agglutinin
- MAA-II
Maackia amurensis agglutinin
- SNA-I
Sambucus nigra agglutinin
- PHA-E
Phaseolus vulgaris erythroagglutinin
- PHAL
Phaseolus vulgaris leucoagglutinin
- PNA
peanut agglutinin
- T antigen
Galβ1-3GalNAcα1 -Ser/Thr
- Tn antigen
GalNAcα1 -Ser/Thr
- UEA-I
Ulex europaeus agglutinin
- VVA
Vicia villosa agglutinin
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