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Stability of the Hexagonal Lattice Structure Formed by an R‐Form Lipopolysaccharide of Klebsiella : Decrease in the Stability by Electrodialysis and Recovery by Addition of the Magnesium
Author(s) -
Kato Nobuo,
Ohta Michio,
Kido Nobuo,
Ito Hideo,
Naito Setsuko,
Kuno Tsuneharu
Publication year - 1986
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.1986.tb00917.x
Subject(s) - electrodialysis , lattice constant , crystal structure , hexagonal crystal system , tris , hexagonal lattice , crystallography , lattice (music) , magnesium , chemistry , membrane , physics , biochemistry , organic chemistry , condensed matter physics , diffraction , antiferromagnetism , acoustics , optics
The R‐form lipopolysaccharide (LPS) from Klebsiella strain LEN‐111 (O3‐:K1‐) forms a hexagonal lattice structure with a lattice constant of 14 to 15 nm when it is precipitated by addition of two volumes of 10 m M MgCl 2 ‐ethanol. When the LPS was suspended in various buffers (50 m M ) at pH 2 to 12 for 24 hr at 4 C, at pH 2 and 3 pits of the hexagonal lattice structure markedly disappeared, at pH 4 to 8.5 the lattice structure was stable, and at pH 9 to 12 it tended to loosen somewhat. The LPS from which cations were removed by electrodialysis retained the ability of hexagonal assembly, although the lattice constant of the hexagonal lattice of the electrodialyzed LPS was large. The lattice structure of the electrodialyzed LPS was much more labile than that of the non‐electrodialyzed LPS at alkaline pH levels and the former was completely disintegrated into ribbon‐like structures when the LPS was suspended in 50 m M Tris buffer at pH 7.7 or higher. However, the electrodialyzed LPS formed a hexagonal lattice structure in Tris buffer at pH 8.5 containing 0.1 to 100 m M MgCl 2 . The lattice constants of the hexagonal lattice formed by the electrodialyzed LPS at 10 or 100 m M MgCl 2 were very similar to that of the lattice of the non‐electrodialyzed LPS. From these results it is concluded that the lability of the hexagonal lattice structure of the electrodialyzed LPS at alkaline conditions is due to removal of Mg 2+ by electrodialysis.

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