Genetica

, Volume 108, Issue 3, pp 239–252

Sub-cellular Localisation of the White/Scarlet ABC Transporter to Pigment Granule Membranes Within the Compound Eye of Drosophila Melanogaster

  • Susan M. Mackenzie
  • Antony J. Howells
  • Graeme B. Cox
  • Gary D. Ewart
Article

DOI: 10.1023/A:1004115718597

Cite this article as:
Mackenzie, S.M., Howells, A.J., Cox, G.B. et al. Genetica (2000) 108: 239. doi:10.1023/A:1004115718597

Abstract

The white, scarlet, and browngenes of Drosophila melanogasterencode ABC transporters involved with the uptake and storage of metabolic precursors to the red and brown eye colour pigments. It has generally been assumed that these proteins are localised in the plasma membrane and transport precursor molecules from the heamolymph into the eye pigment cells. However, the immuno-electron microscopy experiments in this study reveal that the White and Scarlet proteins are located in the membranes of pigment granules within pigment cells and retinula cells of the compound eye. No evidence of their presence in the plasma membrane was observed. This result suggests that, rather than tranporting tryptophan into the cell across the plasma membrane, the White/Scarlet complex transports a metabolic intermediate (such as 3-hydroxy kynurenine) from the cytoplasm into the pigment granules. Other functional implications of this new finding are discussed.

ABC transporter transport ATPase whitegene scarletgene browngene pigment precursor transport 

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Susan M. Mackenzie
    • 1
  • Antony J. Howells
    • 2
  • Graeme B. Cox
    • 1
  • Gary D. Ewart
    • 3
  1. 1.Division of Biochemistry and Molecular Biology, John Curtin School of Medical ResearchThe Australian National UniversityCanberra CityAustralia
  2. 2.Division of Biochemistry and Molecular Biology, Faculty of ScienceThe Australian National UniversityCanberra CityAustralia
  3. 3.Division of Biochemistry and Molecular Biology, John Curtin School of Medical ResearchThe Australian National UniversityCanberra CityAustralia

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