T. Ishizu et al., SOLUTION CONFORMATION OF GINSENG TETRAPEPTIDE H-L-VAL-GAMMA-D-GLU-D-ARG-GLY-OH, Chemical and Pharmaceutical Bulletin, 46(4), 1998, pp. 690-692
The ginseng tetrapeptide H-L-Val-gamma-D-Glu-D-Arg-Gly-OH (1) was synt
hesized using a solution-phase methodology, and its solution conformat
ion in dimethyl sulfoside (DMSO)-d(6) was determined by a combination
of NMR and computational techniques with the DADAS90 program. This com
pound has a rigid backbone based on three intramolecular hydrogen bond
s between D-Arg NH and L-Val CO, between Gly NH and D-Glu CO, and betw
een Gly NH and Gly CO.