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Methyl ?-l-rhamnosyl-(1?2)[?-l-rhamnosyl-(1?3)]-?-l-rhamnoside penta-hydrate: synchrotron study.

ABSTRACT: The title hydrate, C(19)H(34)O(13)·5H(2)O, contains a vicinally disubstituted tris-accharide in which the two terminal rhamnosyl sugar groups are positioned adjacent to each other. The conformation of the tris-accharide is described by the glycosidic torsion angles ?2 = 48?(1)°, ?2 = -29?(1)°, ?3 = 44?(1)° and ?3 = 4?(1)°, whereas the ?2 torsion angle represents a conformation from the major state in solution, the ?3 torsion angle conformation may have been caught near a potential energy saddle-point when compared to its solution structure, in which at least two but probably three conformational states are populated. Extensive inter-molecular O-H?O hydrogen bonding is present in the crystal and a water-containing channel is formed along the b-axis direction.

SUBMITTER: Eriksson L

PROVIDER: S-EPMC3394015 | biostudies-literature | 2012 Jul

REPOSITORIES: biostudies-literature

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Methyl α-l-rhamnosyl-(1→2)[α-l-rhamnosyl-(1→3)]-α-l-rhamnoside penta-hydrate: synchrotron study.

Eriksson Lars L Widmalm Göran G

Acta crystallographica. Section E, Structure reports online 20120627 Pt 7

The title hydrate, C(19)H(34)O(13)·5H(2)O, contains a vicinally disubstituted tris-accharide in which the two terminal rhamnosyl sugar groups are positioned adjacent to each other. The conformation of the tris-accharide is described by the glycosidic torsion angles ϕ2 = 48 (1)°, ψ2 = -29 (1)°, ϕ3 = 44 (1)° and ψ3 = 4 (1)°, whereas the ψ2 torsion angle represents a conformation from the major state in solution, the ψ3 torsion angle conformation may have been caught near a potential energy saddle- ...[more]

PMID: 22798880

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