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Conformation of cyclic heptapeptides: solid and solution state conformation of yunnanin A

✍ Scribed by Hiroshi Morita; Takashi Kayashita; Koichi Takeya; Hideji Itokawa; Motoo Shiro

Publisher: Elsevier Science
Year: 1997
Tongue: French
Weight: 737 KB
Volume: 53
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(96)01098-8

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✦ Synopsis

The solid and solution state conformation of yunnanin A, a cyclic heptapeptide, cyclo(-Gly-Tyr-Gly-Gly-Pro-Phe-Pro-), isolated from the roots of Stellariu yunnanensis were studied. The X-ray diffraction studies showed that the crystal of yunnanin A [orthorhombic form from a ethanol-methanol mixture, a=1 1.754 (lo), b=12.576 (7), c=30.731 (6) A, space group P2221, 2=4] had three intramolecular hydrogen bonds forming one type II, one type II' p-turns, and a classical P-bulge unit with all tram amide bonds.

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