title: Membrane adhesion via homophilic saccharide-saccharide interactions investigated by neutron scattering.
abstract: Solid-supported membrane multilayers doped with membrane-anchored oligosaccharides bearing the LewisX motif (Le(X) lipid) were utilized as a model system of membrane adhesion mediated via homophilic carbohydrate-carbohydrate interactions. Specular and off-specular neutron scattering in bulk aqueous electrolytes allowed us to study multilayer structure and membrane mechanics at full hydration at various Ca(2+) concentrations, indicating that membrane-anchored Le(X) cross-links the adjacent membranes. To estimate forces and energies required for cross-linking, we theoretically modeled the interactions between phospholipid membranes and compared this model with our experimental results on membranes doped with Le(X) lipids. We demonstrated that the bending rigidity, extracted from the off-specular scattering signals, is not significantly influenced by the molar fraction of Le(X) lipids, while the vertical compression modulus (and thus the intermembrane confinement) increases with the molar fraction of Le(X) lipids.
authors.affiliation: Physical Chemistry of Biosystems, Institute of Physical Chemistry, University of Heidelberg, Heidelberg, Germany.
authors.forename: Emanuel
authors.initials: E
authors.lastname: Schneck
authors.forename: Bruno
authors.initials: B
authors.lastname: Demé
authors.forename: Christian
authors.initials: C
authors.lastname: Gege
authors.forename: Motomu
authors.initials: M
authors.lastname: Tanaka
mesh_terms: D015060:1,2-Dipalmitoylphosphatidylcholine / Q000737:chemistry; D000268:Adhesiveness / Q000187:drug effects; D002021:Buffers; D002118:Calcium / Q000494:pharmacology; D002241:Carbohydrates / Q000737:chemistry*; D003198:Computer Simulation; D003432:Cross-Linking Reagents / Q000494:pharmacology; D016256:Lewis X Antigen / Q000737:chemistry; D008055:Lipids / Q000737:chemistry; D055595:Mechanical Phenomena / Q000187:drug effects; D008564:Membrane Potentials / Q000187:drug effects; D008567:Membranes, Artificial; D008956:Models, Chemical; D009502:Neutrons; D012542:Scattering, Radiation; D055672:Static Electricity; D013314:Stress, Mechanical; D013816:Thermodynamics
chemical_list: D002021:Buffers; D002241:Carbohydrates; D003432:Cross-Linking Reagents; D016256:Lewis X Antigen; D008055:Lipids; D008567:Membranes, Artificial; D015060:1,2-Dipalmitoylphosphatidylcholine; D002118:Calcium