Clostridium difficile binary toxin CDT induces clustering of the lipolysis-stimulated lipoprotein receptor into lipid rafts
Contributors: Hornuß, Daniel Verfasser; Nölke, Thilo Verfasser; Hemmasi, Sarah Verfasser; Castonguay, Jan Richard Verfasser; Aktories, Klaus 1948- Verfasser; Albert-Ludwigs-Universität Freiburg Institut für Experimentelle und Klinische Pharmakologie und Toxikologie; Albert-Ludwigs-Universität Freiburg Fakultät für Biologie; Albert-Ludwigs-Universität Freiburg Centre for Biological Signalling Studies; Albert-Ludwigs-Universität Freiburg
Publisher: Universität
Published: 2013
Place of publication: Freiburg
Language: eng
Subjects: Clostridium difficile; Kohlenhydratmangel-Transferrin; Lipid Raft
Description: Abstract: Clostridium difficile is the leading cause of antibiotics-associated diarrhea and pseudomembranous colitis. Hypervirulent C. difficile strains produce the binary actin-ADP-ribosylating toxin CDT (C. difficile transferase), in addition to the Rho-glucosylating toxins A and B. We recently identified the lipolysis-stimulated lipoprotein receptor (LSR) as the host receptor that mediates uptake of CDT into target cells. Here we investigated in H1-HeLa cells, which ectopically express LSR, the influence of CDT on the plasma membrane distribution of the receptor. We found by fluorescence microscopy that the binding component of CDT (CDTb) induces clustering of LSR into subcompartments of the plasma membrane. Detergent extraction of cells treated with CDTb, followed by sucrose gradient fractionation, uncovered accumulation of LSR in detergent-resistant membranes (DRMs) that contained typical marker proteins of lipid rafts. Membrane cholesterol depletion with methyl-β-cyclodextrin inhibited the association of LSR with DRMs upon addition of CDTb. The receptor-binding domain of CDTb also triggered LSR clustering into DRMs. CDTb-triggered clustering of LSR into DRMs could be confirmed in Caco-2 cells. Our data suggest that CDT forces its receptor to cluster into lipid rafts and that oligomerization of the B component might enhance but is not essential for this process
Notes: mBio. 4, 3 (2013), e00244-13, DOI 10.1128/mBio.00244-13, issn: 2150-7511

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