0000000000846690

AUTHOR

Jutta Keller

showing 2 related works from this author

Inhibition of Receptor Signaling to Phospholipase D by Clostridium difficile Toxin B

1996

Rho proteins have been reported to activate phospholipase D (PLD) in in vitro preparations. To examine the role of Rho proteins in receptor signaling to PLD, we studied the effect of Clostridium difficile toxin B, which glucosylates Rho proteins, on the regulation of PLD activity in human embryonic kidney (HEK) cells stably expressing the m3 muscarinic acetylcholine receptor (mAChR). Toxin B treatment of HEK cells potently and efficiently blocked mAChR-stimulated PLD. In contrast, basal and phorbol ester-stimulated PLD activities were not or only slightly reduced. Cytochalasin B and Clostridium botulinum C2 toxin, mimicking the effect of toxin B on the actin cytoskeleton but without involvi…

Phospholipase DG proteinClostridium difficile toxin AClostridium difficile toxin BCell BiologyBiologymedicine.disease_causeActin cytoskeletonBiochemistryMolecular biologyenzymes and coenzymes (carbohydrates)chemistry.chemical_compoundchemistrymedicineClostridium botulinumlipids (amino acids peptides and proteins)Signal transductionMolecular BiologyCytochalasin BJournal of Biological Chemistry
researchProduct

Restoration of Clostridium difficile toxin-B-inhibited phospholipase D by phosphatidylinositol 4,5-bisphosphate.

1996

Receptor signalling to phospholipase D (PLD) in human embryonic kidney (HEK) cells stably expressing the m3 muscarinic acetylcholine receptor apparently involves Rho proteins. Since phosphatidylinositol 4,5-bisphosphate [PtdIns(4,5)P2] has been recognized as an essential cofactor for PLD activity and since activated Rho proteins have been reported to stimulate the synthesis of PtdIns(4,5)P2, we studied whether in HEK cells PLD activity is regulated by PtdIns(4,5)P2 and, in particular, whether PtdIns(4,5)P2 can restore PLD activity inhibited by Clostridium difficile toxin B, which inactivates Rho proteins. Addition of MgATP to permeabilized HEK cells increased basal PLD activity and potentia…

Phosphatidylinositol 45-DiphosphateGTP'Bacterial ToxinsClostridium difficile toxin BBiologyBiochemistryCell Linechemistry.chemical_compoundBacterial ProteinsGTP-Binding ProteinsPhosphatidylcholineRhoB GTP-Binding ProteinPhospholipase DHumansPhosphatidylinositolEnzyme InhibitorsrhoB GTP-Binding ProteinPhospholipase DClostridioides difficileHEK 293 cellsCell MembraneMembrane ProteinsReceptors MuscarinicCell biologyEnzyme Activationenzymes and coenzymes (carbohydrates)chemistryPhosphatidylinositol 45-bisphosphateGuanosine 5'-O-(3-Thiotriphosphate)lipids (amino acids peptides and proteins)European journal of biochemistry
researchProduct