Search results for "Transmembrane helix"

showing 4 items of 4 documents

Binding mode analysis of ABCA7 for the prediction of novel Alzheimer's disease therapeutics

2021

Graphical abstract

ATP Adenosine-triphosphateNBD nucleotide binding domainGSH reduced glutathionePolypharmacologyAlzheimer’s disease (AD)ATP-binding cassette transporterHTS high-throughput screeningBiochemistryABCA7Structural BiologyPLIF protein ligand interactionMSD membrane spanning domainPDB protein data bankTM transmembrane helixABC ATP-binding cassetteMultitarget modulation (PANABC)RMSD root mean square distanceABC transporter (ABCA1 ABCA4 ABCA7)Computer Science ApplicationsMOE Molecular Operating EnvironmentPharmacophoreSNP single-nucleotide polymorphismBiotechnologyResearch ArticleBBB blood-brain barrierBiophysicsDrug designComputational biologyBiologyAD Alzheimer’s diseasePET positron emission tomographyIC intracellular helixAPP amyloid precursor proteincryo-EM cryogenic-electron microscopyGeneticsHomology modelingBinding siteRational drug design and developmentComputingMethodologies_COMPUTERGRAPHICSNBD-cholesterol 7-nitro-2-13-benzoxadiazol-4-yl-cholesterolTransporterPSO particle swarm optimizationPET tracer (PETABC)ECD extracellular domainR-domain/region regulatory domain/regionABCA1biology.proteinEH extracellular helixTP248.13-248.65BODIPY-cholesterol 44-difluoro-4-bora-3a4a-diaza-s-indacene-cholesterolComputational and Structural Biotechnology Journal
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A Ser residue influences the structure and stability of a Pro-kinked transmembrane helix dimer

2012

AbstractWhen localized adjacent to a Pro-kink, Thr and Ser residues can form hydrogen bonds between their polar hydroxyl group and a backbone carbonyl oxygen and thereby modulate the actual bending angle of a distorted transmembrane α-helix. We have used the homo-dimeric transmembrane cytochrome b559′ to analyze the potential role of a highly conserved Ser residue for assembly and stabilization of transmembrane proteins. Mutation of the conserved Ser residue to Ala resulted in altered heme binding properties and in increased stability of the holo-protein, most likely by tolerating subtle structural rearrangements upon heme binding. The results suggest a crucial impact of an intrahelical Ser…

Models MolecularProlineHeme bindingStereochemistryDimerMolecular ConformationBiophysicsCofactor bindingHemeBiochemistryProtein Structure Secondarychemistry.chemical_compoundProtein structureProtein stabilitySerineProtein foldingCofactor bindingHydrogen bondCell MembranePhotosystem II Protein ComplexHydrogen BondingCell BiologyCytochrome b GroupTransmembrane proteinProtein Structure TertiaryOxygenTransmembrane domainHelix interactionchemistrySpectrophotometryMembrane proteinMutationTransmembrane helixProtein foldingDimerizationProtein BindingBiochimica et Biophysica Acta (BBA) - Biomembranes
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The membrane environment modulates self-association of the human GpA TM domain--implications for membrane protein folding and transmembrane signaling.

2010

Abstract The influence of lipid bilayer properties on a defined and sequence-specific transmembrane helix–helix interaction is not well characterized yet. To study the potential impact of changing bilayer properties on a sequence-specific transmembrane helix–helix interaction, we have traced the association of fluorescent-labeled glycophorin A transmembrane peptides by fluorescence spectroscopy in model membranes with varying lipid compositions. The observed changes of the glycophorin A dimerization propensities in different lipid bilayers suggest that the lipid bilayer thickness severely influences the monomer–dimer equilibrium of this transmembrane domain, and dimerization was most effici…

Protein FoldingLipid BilayersMolecular Sequence DataBiophysicsGpABiochemistryFluorescenceMembrane LipidsOrientations of Proteins in Membranes databaseMembrane fluidityFluorescence Resonance Energy TransferHumansAmino Acid SequenceGlycophorinsBilayerLipid bilayerIntegral membrane proteinBinding SitesChemistryBilayerPeripheral membrane proteinTemperatureMembrane ProteinsCell BiologyTransmembrane proteinCell biologyTransmembrane domainCholesterolSpectrometry FluorescenceFRETPhosphatidylcholineslipids (amino acids peptides and proteins)Transmembrane helix–helix interactionProtein MultimerizationPeptidesHydrophobic and Hydrophilic InteractionsSignal TransductionBiochimica et biophysica acta
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Influence of hydrophobic matching on association of model transmembrane fragments containing a minimised glycophorin A dimerisation motif

2005

AbstractThe principles that govern the folding and packing of membrane proteins are still not completely understood. In the present work, we have revisited the glycophorin A (GpA) dimerisation motif that mediates transmembrane (TM) helix association, one of the best-suited models of membrane protein oligomerisation. By using artificial polyleucine TM segments we have demonstrated in this study that a pattern of only five amino acids (GVxxGVxxT) promotes specific dimerisation. Further, we have used this minimised GpA motif to assess the influence of hydrophobic matching on the TM helix packing process in detergent micelles and found that this factor modulates helix–helix association and/or d…

Protein FoldingRecombinant Fusion ProteinsAmino Acid MotifsMolecular Sequence DataBiophysicsBiochemistryMicelleHydrophobic mismatchHydrophobic mismatchStructural BiologyLeucineHelix packingGeneticsGlycophorinAnimalsHumansAmino Acid SequenceGlycophorinsMolecular BiologyPolyacrylamide gel electrophoresischemistry.chemical_classificationbiologyChemistryGlycophorin AProteïnes de membranaMembrane ProteinsMembrane protein associationCell BiologyTransmembrane proteinAmino acidTransmembrane domainBiochemistryMembrane proteinMutationTransmembrane helixBiophysicsbiology.proteinPeptidesDimerizationHydrophobic and Hydrophilic Interactions
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