Membrane Protein Expression in the Eyes of Transgenic Flies

  • Valérie PanneelsEmail author
  • Irmgard Sinning
Part of the Methods in Molecular Biology™ book series (MIMB, volume 601)


Eukaryotic membrane proteins are often difficult to obtain in sufficient amounts for structural studies using classical cell culture overexpression systems. This could be due to incomplete protein maturation and insufficient trafficking to the plasma membrane or to a cytotoxic effect of the recombinant membrane protein changing the overall metabolism. The method presented here takes advantage of the membrane stacks in the retina, where rhodopsin resides. The idea is to direct G protein-coupled receptors (GPCRs) and transporters to these membrane stacks and to express the target proteins in the retina of transgenic Drosophila melanogaster. Drosophila was chosen since fly genetics are well established and rather easily accessible. Metabotropic glutamate receptor mGluRa from Drosophila was among the first examples for GPCRs expressed in this system. It showed high expression yield, functionality and high homogeneity. When the same protein was expressed in Sf9 cells, however, contamination by immature protein was a problem. Encouraged by this success, the fly system is now successfully used for a larger variety of membrane proteins, including mammalian GPCRs and transporters.

Key words

Drosophila EAAT2 fly genetics glutamate transporter GPCR membrane protein overexpression photoreceptor cells retina rhodopsin transporter 



We thank Ann Mari Voie (EMBL, Heidelberg) for technical advices and Silke Adrian for excellent technical assistance. This work was supported by the European Community Specific Targeted Research Project grant IMPS (Innovative Tools for Membrane Structural Proteomics, FP6-2003-LifeSciHealth 513770).


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Copyright information

© Humana Press, a part of Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.Heidelberg University Biochemistry Center (BZH)HeidelbergGermany

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