Cited by 452Cellular transport and secretionmelanin and skin pigmentationCalcium signaling and nucleotide metabolism

Distinct Protein Sorting and Localization to Premelanosomes, Melanosomes, and Lysosomes in Pigmented Melanocytic Cells✪

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Raposo, Graça, Tenza, Danielle, Murphy, Diane M., Berson, Joanne F., Marks, Michael S.·2001·The Journal of Cell Biology

Abstract

Melanosomes and premelanosomes are lysosome-related organelles with a unique structure and cohort of resident proteins. We have positioned these organelles relative to endosomes and lysosomes in pigmented melanoma cells and melanocytes. Melanosome resident proteins Pmel17 and TRP1 localized to separate vesicular structures that were distinct from those enriched in lysosomal proteins. In immunogold-labeled ultrathin cryosections, Pmel17 was most enriched along the intralumenal striations of premelanosomes. Increased pigmentation was accompanied by a decrease in Pmel17 and by an increase in TRP1 in the limiting membrane. Both proteins were largely excluded from lysosomal compartments enriched in LAMP1 and cathepsin D. By kinetic analysis of fluid phase uptake and immunogold labeling, premelanosomal proteins segregated from endocytic markers within an unusual endosomal compartment. This compartment contained Pmel17, was accessed by BSA–gold after 15 min, was acidic, and displayed a cytoplasmic planar coat that contained clathrin. Our results indicate that premelanosomes and melanosomes represent a distinct lineage of organelles, separable from conventional endosomes and lysosomes within pigmented cells. Furthermore, they implicate an unusual clathrin-coated endosomal compartment as a site from which proteins destined for premelanosomes and lysosomes are sorted.

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Authors
Raposo, G., Tenza, D., Murphy, D. M., Berson, J. F., & Marks, M. S.
Affiliations
  • aCurie Institute, Research Section, Paris, 7505 France
  • University of Pennsylvania (US)
Venue
The Journal of Cell Biology
Published
2001-02-19
Volume
152
Issue
4
Pages
809-824
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W2106782182
Cited by
451
References
64
Citations by year
2026: 4 · 2025: 17 · 2024: 17 · 2023: 15 · 2022: 17 · 2021: 23 · 2020: 19 · 2019: 13 · 2018: 21 · 2017: 25 · 2016: 11 · 2015: 13 · 2014: 14 · 2013: 21 · 2012: 12
FWCI
8.04
Type
journal article
Language
en
Open access
Licence
cc-by-nc-sa
Locations
  • The Journal of Cell Biology (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
Funders
  • National Eye Institute (R01 EY 12207, R01EY012207)
  • National Cancer Institute (T32CA009140, T32 CA 09140)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Calcium signaling and nucleotide metabolism
Keywords
premelanosomes, melanosomes, lysosomes, protein sorting, melanosome biogenesis, gp100, TRP-1, melanocytes, melanoma cells, pigmentation, LAMP1, cathepsin D, endosomes, organelle biogenesis
MeSH terms
Endocytosis, Lysosomes, Melanocytes, Membrane Glycoproteins, Models, Biological, Neoplasm Proteins, Proteins, Endosomes, Organelles, Lysosomal Storage Diseases, Melanosomes, Protein Transport, Protein Sorting Signals, Clathrin-Coated Vesicles, gp100 Melanoma Antigen

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