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Postfixation detergent treatment liberates the membrane modelling protein Pex11β from peroxisomal membranes

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Abstract

Pex11 proteins are involved in membrane remodelling processes of peroxisomes, and are key components of peroxisomal division and proliferation. In mammals, three Pex11 isoforms, Pex11α, Pex11β, and Pex11γ exist. Here we demonstrate that Pex11β, but not Pex11α or Pex11γ, is almost exclusively extracted from peroxisomal membranes of paraformaldehyde-fixed cells by permeabilisation with the non-ionic detergent Triton X-100. This results in diminished detection of Myc-Pex11β in immunofluorescence preparations and appearance of the protein in the Triton X-100 extract. To our knowledge, Pex11β is the first peroxisomal membrane protein showing such a peculiar behaviour. Loss of Pex11β can be avoided by permeabilisation with digitonin, the addition of glutaraldehyde to the fixative, or the expression of a Pex11 fusion protein with a larger protein tag (e.g. YFP). Our observations further point to different functions and biochemical properties of the Pex11 isoforms within the peroxisomal membrane and during peroxisome proliferation.

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Fig. 1
Fig. 2

Abbreviations

ER:

Endoplasmic reticulum

Pex:

Peroxin (peroxisomal protein required for peroxisome biogenesis)

PMP:

Peroxisomal membrane protein

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Acknowledgments

This work was supported by the Portuguese Foundation for Science and Technology (FCT) and FEDER (REEQ/1023/BIO/2005; PTDC/BIA-BCM/099613/2008; SFRH/BD/80542/2011 to M. A.), and CRUP/DAAD (Acção integrada 2011, A-29/11).

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Correspondence to Michael Schrader.

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Schrader, M., Almeida, M. & Grille, S. Postfixation detergent treatment liberates the membrane modelling protein Pex11β from peroxisomal membranes. Histochem Cell Biol 138, 541–547 (2012). https://doi.org/10.1007/s00418-012-1010-8

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