0000000000591093

AUTHOR

Matthias Wilm

showing 3 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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p38 MAPK Controls Prothrombin Expression by Regulated RNA 3′ End Processing

2011

Thrombin is a key protease involved in blood coagulation, complement activation, inflammation, angiogenesis, and tumor invasion. Although induced in many (patho-)physiological conditions, the underlying mechanisms controlling prothrombin expression remained enigmatic. We have now discovered that prothrombin expression is regulated by a posttranscriptional regulatory mechanism responding to stress and inflammation. This mechanism is triggered by external stimuli that activate p38 MAPK. In turn, p38 MAPK upmodulates canonical 3' end processing components and phosphorylates the RNA-binding proteins FBP2 and FBP3, which inhibit 3' end processing of mRNAs, such as prothrombin mRNA, that bear a d…

MaleAdenosinePolymersp38 mitogen-activated protein kinasesInflammationPlasma protein bindingBiologyp38 Mitogen-Activated Protein KinasesGene Expression Regulation EnzymologicMiceThrombinCell Line TumormedicineAnimalsHumansNeoplasm InvasivenessRNA MessengerMolecular BiologyRegulation of gene expressionMessenger RNARNACell BiologyXenograft Model Antitumor AssaysCell biologyRibonucleoproteinsImmunologyPhosphorylationRNAProthrombinmedicine.symptomRNA 3' End Processingmedicine.drugProtein BindingMolecular Cell
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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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