0000000000644518

AUTHOR

Robert Bittman

showing 3 related works from this author

The hedgehog receptor patched is involved in cholesterol transport.

2011

International audience; BACKGROUND: Sonic hedgehog (Shh) signaling plays a crucial role in growth and patterning during embryonic development, and also in stem cell maintenance and tissue regeneration in adults. Aberrant Shh pathway activation is involved in the development of many tumors, and one of the most affected Shh signaling steps found in these tumors is the regulation of the signaling receptor Smoothened by the Shh receptor Patched. In the present work, we investigated Patched activity and the mechanism by which Patched inhibits Smoothened. METHODOLOGY/PRINCIPAL FINDINGS: Using the well-known Shh-responding cell line of mouse fibroblasts NIH 3T3, we first observed that enhancement …

ciliumlcsh:MedicineyeastBiochemistryReceptors G-Protein-CoupledTransmembrane Transport ProteinsMicechemistry.chemical_compound0302 clinical medicineMolecular Cell Biology[SDV.IDA]Life Sciences [q-bio]/Food engineeringMembrane Receptor SignalingBiomacromolecule-Ligand InteractionsSonic hedgehoglcsh:ScienceComputingMilieux_MISCELLANEOUS0303 health sciencesMultidisciplinaryMechanisms of Signal TransductionVeratrum Alkaloids[SDV.IDA] Life Sciences [q-bio]/Food engineeringdrosophilaSmoothened ReceptorLipidsHedgehog signaling pathwayCell biologySterolsSmoothened ReceptorAlimentation et Nutritionembryonic structurescilMembranes and Sorting[SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]Signal transductionvesicular traffickingSignal TransductionResearch Articleprimary ciliumPatched ReceptorsPatchedsignal-transductionanimal structuresCyclopamine[SPI.GPROC] Engineering Sciences [physics]/Chemical and Process EngineeringBiophysicsReceptors Cell Surfacepathway activationSaccharomyces cerevisiaetransduction du signalBiology03 medical and health sciencessonic hedgehoglipidAnimalsHumansFood and NutritionHedgehog Proteins[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process EngineeringBiology030304 developmental biologyPatched Receptorsprotein signalsCell Membranelcsh:RProteinscholesterolBiological TransportTransmembrane Proteinssterol-sensing domainchemistry[ SDV.NEU ] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]NIH 3T3 Cellscholesterol;lipid;cell trafficking; yeast;drosophila;cells ; pathway activation; vesicular trafficking; signal-transduction; sonic hedgehog;sterol-sensing domain; primary cilium;protein signalsbiology.proteincellslcsh:Qcell traffickingSmoothened030217 neurology & neurosurgery
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Interaction of the Vibrio cholerae cytolysin (VCC) with cholesterol, some cholesterol esters, and cholesterol derivatives: a TEM study.

2002

The Vibrio cholerae cytolysin (VCC) 63-kDa monomer has been shown to interact in aqueous suspension with cholesterol microcystals to produce a ring/pore-like heptameric oligomer approximately 8 nm in outer diameter. Transmission electron microscopy data were produced from cholesterol samples adsorbed to carbon support films, spread across the holes of holey carbon films, and negatively stained with ammonium molybdate. The VCC oligomers initially attach to the edge of the stacked cholesterol bilayers and with increasing time cover the two planar surfaces. VCC oligomers are also released into solution, with some tendency to cluster, possibly via the hydrophobic membrane-spanning domain. At th…

ErgosterolLiposomeCytotoxinsTemperatureOligomerNegative stainProtein Structure TertiaryCrystallographychemistry.chemical_compoundMicroscopy ElectronMonomerCholesterolchemistryPulmonary surfactantModels ChemicalStructural BiologySide chainImage Processing Computer-Assistedlipids (amino acids peptides and proteins)CytolysinCholesterol EstersVibrio choleraeFluorescent DyesJournal of structural biology
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Coupling of Cholesterol and Cone-shaped Lipids in Bilayers Augments Membrane Permeabilization by the Cholesterol-specific Toxins Streptolysin O and V…

2001

Abstract Vibrio cholerae cytolysin (VCC) forms oligomeric pores in lipid bilayers containing cholesterol. Membrane permeabilization is inefficient if the sterol is embedded within bilayers prepared from phosphatidylcholine only but is greatly enhanced if the target membrane also contains ceramide. Although the enhancement of VCC action is stereospecific with respect to cholesterol, we show here that no such specificity applies to the two stereocenters in ceramide; all four stereoisomers of ceramide enhanced VCC activity in cholesterol-containing bilayers. A wide variety of ceramide analogs were as effective asd-erythro-ceramide, as was diacylglycerol, suggesting that the effect of ceramide …

Cholera ToxinCeramideCell Membrane PermeabilityLipid BilayersBiologyCeramidesBiochemistrychemistry.chemical_compoundBacterial ProteinsPhosphatidylcholineLipid bilayerNuclear Magnetic Resonance BiomolecularVibrio choleraeMolecular BiologyDiacylglycerol kinaseCytotoxinsCell BiologyLipid MetabolismLipidsSphingolipidSterolCholesterolchemistryBiochemistryStreptolysinslipids (amino acids peptides and proteins)StreptolysinCytolysinJournal of Biological Chemistry
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