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RESEARCH PRODUCT

Pore formation by Vibrio cholerae cytolysin requires cholesterol in both monolayers of the target membrane

Oleg V. KrasilnikovLiliya N. YuldashevaVera Lúcia De Menezes LimaAlexander ZitzerPetr G. MerzlyakAngela Valeva

subject

Pore Forming Cytotoxic Proteinsgenetic structuresLipid BilayersBiologymedicine.disease_causeBiochemistrychemistry.chemical_compoundMonolayermedicineAnimalsMoleculeVibrio choleraePore-forming toxinMembrane GlycoproteinsPerforinCholesterolbeta-CyclodextrinsGeneral Medicineeye diseasesTransmembrane proteinCholesterolMembraneBiochemistrychemistryVibrio choleraeBiophysicsCattlelipids (amino acids peptides and proteins)sense organsCytolysin

description

Vibrio cholerae cytolysin (VCC) forms oligomeric transmembrane pores in cholesterol-rich membranes. To better understand this process, we used planar bilayer membranes. In symmetric membranes, the rate of the channel formation by VCC has a superlinear dependency on the cholesterol membrane fraction. Thus, more than one cholesterol molecule can facilitate VCC-pore formation. In asymmetric membranes, the rate of pore formation is limited by the leaflet with the lower cholesterol content. Methyl-beta-cyclodextrin, which removes cholesterol from membranes, rapidly inhibits VCC pore formation, even when it is added to the side opposite that of VCC addition. The results suggest that cholesterol in both membrane leaflets aid VCC-pore formation and that either leaflet can function as a kinetic bottleneck with respect to the rate of pore-formation.

yearjournalcountryeditionlanguage
2007-03-01Biochimie
https://doi.org/10.1016/j.biochi.2006.12.003