Journal of the Chemical Society. Perkin transactions II p. 1829 - 1837 (1990)
Update date:2022-08-02
Topics:
Benedetti, Ettore
Blasio, Benedetto Di
Pavone, Vincenzo
Pedone, Carlo
Santini Antonello
et al.
A crystal-state structural analysis of pBrBz-(Aib-L-Ala)5-OMe tetrahydrate and pBrBz-(Aib-L-Ala)6-OMe dihydrate has been performed by X-ray diffarction.The decapeptide and dodecapeptide molecules are both basically α-helical with five and seven 1 <- 5 intramolecular H-bonds, respectively.A similarity between the two structures is also seen near the C-terminus, where regularity of the α-helix is disrupted in favour of formation of intramolecular H-bonds of the 1 <- 4 and 1 <- 6 types.A brief comparison with parameters and interactions characteristic of the helices present in globular proteins has been made.
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