Cited by 50Glycosylation and Glycoproteins Researchmelanin and skin pigmentationCellular transport and secretion

Sialylated Core 1 O-Glycans Influence the Sorting of Pmel17/gp100 and Determine Its Capacity to Form Fibrils

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Valencia, Julio C., Rouzaud, Francois, Julien, Sylvain, Chen, Kevin G., Passeron, Thierry, Yamaguchi, Yuji, Abu-Asab, Mones, Tsokos, Maria +6 more·2007·Journal of Biological Chemistry

Abstract

Pmel17 is a melanocyte/melanoma-specific protein that is essential for the maturation of melanosomes to form mature, fibrillar, and pigmented organelles. Recently, we reported that the less glycosylated form of Pmel17 (termed iPmel17) is sorted via the plasma membrane in a manner distinct from mature Pmel17 (termed mPmel17), which is sorted directly to melanosomes. To clarify the mechanism(s) underlying the distinct processing and sorting of Pmel17, we generated a highly specific antibody (termed alphaPEP25h) against an epitope within the repeat domain of Pmel17 that is sensitive to changes in O-glycosylation. alphaPEP25h recognizes only iPmel17 and allows analysis of the processing and sorting of iPmel17 when compared with alphaPEP13h, an antibody that recognizes both iPmel17 and mPmel17. Our novel findings using alphaPEP25h demonstrate that iPmel17 differs from mPmel17 not only in its sensitivity to endoglycosidase H, but also in the content of core 1 O-glycans modified with sialic acid. This evidence reveals that iPmel17 is glycosylated differently in the Golgi and that it is sorted through the secretory pathway. Analysis of Pmel17 processing in glycosylation-deficient mutant cells reveals that Pmel17 lacking the correct addition of sialic acid and galactose loses the ability to form fibrils. Furthermore, we show that addition of sialic acid affects the stability and sorting of Pmel17 and reduces pigmentation. Alterations in sialyltransferase activity and substrates differ between normal and transformed melanocytes and may represent a critical change during malignant transformation.

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Crossref · 10.1074/jbc.m608449200

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Authors
Valencia, J. C., Rouzaud, F., Julien, S., Chen, K. G., Passeron, T., Yamaguchi, Y., Abu-Asab, M., Tsokos, M., Costin, G. E., Yamaguchi, H., Jenkins, L. M. M., Nagashima, K., Appella, E., & Hearing, V. J.
Affiliations
  • National Institutes of Health (US)
  • Guy's Hospital (GB)
Corresponding author
  • Valencia, Julio C.
  • Hearing, Vincent J.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2007-04
Volume
282
Issue
15
Pages
11266-11280
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2057452550
Cited by
50
References
69
Citations by year
2026: 1 · 2024: 5 · 2023: 1 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 3 · 2018: 3 · 2017: 1 · 2016: 3 · 2015: 2 · 2014: 1 · 2013: 3 · 2012: 3
FWCI
1.99
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (Z99 NS999999)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
Keywords
gp100, core 1 O-glycans, sialic acid, O-glycosylation, melanosome biogenesis, protein sorting, secretory pathway, Golgi processing, fibril formation, melanocyte pigmentation, sialyltransferase, malignant transformation, melanoma
MeSH terms
Animals, Antibodies, Endoplasmic Reticulum, Cricetinae, Humans, Membrane Glycoproteins, Polysaccharides, Time Factors, Microscopy, Immunoelectron, N-Acetylneuraminic Acid, Melanosomes, Protein Transport, Cell Line, Tumor, gp100 Melanoma Antigen

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