Influence of Surface Chemistry on the Structural Organization of Monomolecular Protein Layers Adsorbed to Functionalized Aqueous Interfaces
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The molecular organization of streptavidin (SA) bound to aqueous surface monolayers of biotin-functionalized lipids and binary lipid mixtures has been investigated with neutron reflectivity and electron and fluorescence microscopy. The substitution of deuterons (2H) for protons (1H), both in subphase water molecules and in the alkyl chains of the lipid surface monolayer, was utilized to determine the interface structure on the molecular length scale. In all cases studied, the protein forms monomolecular layers underneath the interface with thickness values of approximately 40 A. A systematic dependence of the structural properties of such self-assembled SA monolayers on the surface chemistry was observed: the lateral protein density depends on the length of the spacer connecting the biotin moiety and its hydrophobic anchor. The hydration of the lipid head groups in the protein-bound state depends on the dipole moment density at the interface.
Heinrich F, Losche M Biochim Biophys Acta. 2014; 1838(9):2341-9.
PMID: 24674984 PMC: 4082750. DOI: 10.1016/j.bbamem.2014.03.007.
Holt S, Le Brun A, Majkrzak C, McGillivray D, Heinrich F, Losche M Soft Matter. 2011; 5(13):2576-2586.
PMID: 21311730 PMC: 3035324. DOI: 10.1039/B822411K.
A model membrane protein for binding volatile anesthetics.
Ye S, Strzalka J, Churbanova I, Zheng S, Johansson J, Blasie J Biophys J. 2004; 87(6):4065-74.
PMID: 15465862 PMC: 1304915. DOI: 10.1529/biophysj.104.051045.
Comparative structural studies of Vpu peptides in phospholipid monolayers by x-ray scattering.
Zheng S, Strzalka J, Jones D, Opella S, Blasie J Biophys J. 2003; 84(4):2393-415.
PMID: 12668448 PMC: 1302806. DOI: 10.1016/S0006-3495(03)75045-0.
Hydration state of single cytochrome c monolayers on soft interfaces via neutron interferometry.
Kneller L, Edwards A, Nordgren C, Blasie J, Berk N, Krueger S Biophys J. 2001; 80(5):2248-61.
PMID: 11325727 PMC: 1301416. DOI: 10.1016/S0006-3495(01)76197-8.