0000000000591092

AUTHOR

Jörg Selzer

showing 2 related works from this author

Glucosylation of Rho proteins by Clostridium difficile toxin B.

1995

TOXIN A and B, the major virulence factors of Clostridium difficile, are the causative agents of antibiotic-associated pseudomembran-ous colitis. In cultured cell lines their potent cytotoxicity results from their ability to induce disaggregation of the microfilament cytoskeleton1,2. Toxin B acts on the low-molecular-mass GTPase Rho A3,4, which is involved in the regulation of the actin cytoskeleton. We report here that toxin B catalyses the incorporation of up to one mole of glucose per mole of RhoA at the amino acid thre-onine at position 37. The modification was identified and localized by tandem electrospray mass spectrometry. UDP-glucose selectively serves as cosubstrate for the monogl…

ThreonineRHOAGlycosylationBacterial ToxinsMolecular Sequence DataClostridium difficile toxin AClostridium difficile toxin Bmacromolecular substancesmedicine.disease_causeMicrofilamentCatalysisMass SpectrometryGTP PhosphohydrolasesBacterial ProteinsGTP-Binding ProteinsmedicineTumor Cells CulturedAnimalsAmino Acid SequenceCytoskeletonActinCells CulturedCytoskeletonMultidisciplinarybiologyToxinClostridioides difficileActin cytoskeletonActinsRecombinant ProteinsRatsGlucoseMarsupialiaBiochemistryGlucosyltransferasesbiology.proteinrhoA GTP-Binding ProteinNature
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The Enterotoxin from Clostridium difficile (ToxA) Monoglucosylates the Rho Proteins

1995

The enterotoxin from Clostridium difficile (ToxA) is one of the causative agents of the antibiotic-associated pseudomembranous colitis. In cultured monolayer cells ToxA exhibits cytotoxic activity to induce disassembly of the actin cytoskeleton, which is accompanied by morphological changes. ToxA-induced depolymerization of actin filaments is correlated with a decrease in the ADP-ribosylation of the low molecular mass GTP-binding Rho proteins (Just, I., Selzer, J., von Eichel-Streiber, C., and Aktories, K. (1995) J. Clin. Invest. 95, 1026-1031). Here we report on the identification of the ToxA-induced modification of Rho. Applying electrospray mass spectrometry, the mass of the modification…

RHOAGlycoside HydrolasesBacterial ToxinsClostridium difficile toxin ARAC1macromolecular substancesEnterotoxinBiochemistrySubstrate SpecificityEnterotoxinsGTP-Binding ProteinsTumor Cells CulturedAmino AcidsMolecular BiologyActinbiologyMolecular massClostridioides difficileCell BiologyPseudomembranous colitisActin cytoskeletonMolecular biologycarbohydrates (lipids)GlucoseBiochemistrybiology.proteinrhoA GTP-Binding ProteinJournal of Biological Chemistry
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