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Studies on structures of lipid A-monophosphate clusters
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See supplementary materials at http://dx.doi.org/10.1063/1.3553809
for S1: atomic numbering scheme for the lipid A-monophosphate; S2: Table I experimental (dobs
) and calculated (dcalc
) spacings for the P21
and C2 lipid A-monophosphate polymorphs; S3: fractional atomic coordinates for nonhydrogen atoms of lipid A-monophosphate for the P21
and C2 polymorphs; S4: torsion angles of the diglucosamine monophosphate of the two lipid A-monophosphate polymorphs; S5: list of hydrogen bonds, distances, donor and acceptor angles; S6: full Ref. 31. [Supplementary Material]
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Single crystalline clusters of lipid A-monophosphate were grown from organic dispersions containing 5–15% (v/v) water at various volume fractions, ϕ, and temperatures. The morphology of the single lipid A-monophosphate crystals was either rhombohedral or hexagonal. The hexagonal crystals were needlelike or cylindrical in shape, with the long dimension parallel to the c axis of the unit cell. The crystalline clusters were studied using electron microscopy and x-ray powderdiffraction. Employing molecular location methods following a Rietveld refinement and whole-pattern refinement revealed two monoclinic crystal structures in the space groups P21 and C2, both converged with R F = 0.179. The two monoclinic crystal structures were packing (hydrocarbon chains) and conformational (sugar) polymorphs. Neither of these two structures had been encountered previously. Only intramolecular hydrogen bonding was observed for the polymorphs, which were located between the amide and the carboxyl groups. Another crystalline structure was found in the volume-fraction range 2.00 × 10−3 ≤ ϕ ≤ 2.50 × 10−3, which displayed hexagonal symmetry. The hexagonal symmetry of the self-assembled lipid A-monophosphate crystalline phase might be reconciled with the monoclinic symmetry found at low-volume-fractions. Therefore, lowering the symmetry from cubic, i.e., Ia d, to rhombohedral R m, and finally to the monoclinic space group C2 was acceptable if the lipid A-monophosphate anion was completely orientationally ordered.
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