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High state of order of isolated bacterial lipopolysaccharide and its possible contribution to the permeation barrier property of the outer membrane
Comparison of these structural properties with those known for natural phospholipids in biological membranes indicates that the high state of order of the lipid A portion of L PS might be an important factor in the structural role and permeation barrier functions of LPS in the outer membrane of gram-negative bacteria. Expand
Molecular modelling of the three-dimensional structure and conformational flexibility of bacterial lipopolysaccharide
According to the calculations, the Ra-LPS moiety has an approximately cylindrical shape and is conformationally well defined, in contrast to the O-specific chain, which was found to be the most flexible portion within the molecule. Expand
Effect of lipoteichoic acid on thermotropic membrane properties
Three amphiphiles embedded in dipalmitoylglycerophosphoglycerol vesicles were studied, and their thermotropic influence on this matrix was studied by differential scanning calorimetry to propose an additional effect by hydrogen bonding the hydroxyls of the sugar rings to their phospholipid neighbors. Expand
Molecular Dynamics Study of the Structure and Dynamics of the Hydration Shell of Alkaline and Alkaline-Earth Metal Cations
Molecular dynamics simulations of hydrated alkaline and alkaline-earth metal cations at room temperature (T = 300 K) were carried out using the CHARMM22 force field. Dynamic and static properties ofExpand
Infrared spectroscopy, a tool for probing bacterial peptidoglycan. Potentialities of infrared spectroscopy for cell wall analytical studies and rejection of models based on crystalline chitin.
Several distinctive, fingerprint-like spectral features of the various murein samples permitted a facile identification of individual peptidoglycans, and infrared spectroscopy seems to be very promising as an analytical tool, e.g. for tracing variations of cell wall structure, detecting conformational changes and estimating crosslinking indices in a quick and simple way. Expand
Omega-Scan: an X-ray tool for the characterization of crystal properties
The X-ray diffractometric Ω-Scan method needs only one measuring circle to determine the lattice geometry of single crystals. From the angular positions of at least two reflection pairs theExpand
On the secondary and tertiary structure of murein. Low and medium-angle X-ray evidence against chitin-based conformations of bacterial peptidoglycan.
X-ray diffraction, density measurements, and stereochemical data were used in order to disclose the architecture of murein, the rigid component of almost all bacterial cell walls, and invalidate the advanced models of a chitin-like structure of the glycan chains in muresin. Expand
Molecular dynamics simulations of six different fully hydrated monomeric conformers of Escherichia coli re-lipopolysaccharide in the presence and absence of Ca2+.
Six previously published conformational models of Escherichia coli Re lipopolysaccharide (ReLPS) were subjected to molecular dynamics simulations using the CHARMM force field to present one conformation, C, which is thought to best represent the average structure of the ReLPS conformers. Expand
Vibrational spectroscopic analysis of LD‐sequential, bacterial cell wall peptides: An IR and raman study
It is concluded that the peptides show a strong propensity to form hydrated, strongly associated aggregates in water, persisting even in aqueous solution. Expand
Cardiolipin, alpha-D-glucopyranosyl, and L-lysylcardiolipin from gram-positive bacteria: FAB MS, monofilm and X-ray powder diffraction studies.
Cardiolipin preparations from Streptococcus B, Listeria welshimeri, Staphylococcus aureus, and a glucosyl and lysyl derivative of cardiolipin were analysed for fatty acid composition and fatty acidExpand