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Structure and conformation of linear peptides

1986; Wiley; Volume: 27; Issue: 3 Linguagem: Inglês

10.1111/j.1399-3011.1986.tb01814.x

0367-8377

V. LALITHA, E. SUBRAMANINA, R. Parthasarathy,

DNA and Nucleic Acid Chemistry

The tripeptide, L‐prolyl‐glycyl‐glycine, crystallizes in the trigonal space group P3 2 , with a = b = 8.682(2)Å, c= 12.008(2) and Z = 3. The structure was solved by direct methods and refined to an R‐value of 0.07 for 727 reflections (I > 1.0s̀). The molecule exists as a zwitterion in the crystal. The peptide units and trans and show significant deviations from planarity (ω 1 = 169.7 o , ω 2 =‐170.1 o ). The peptide backbone adopts a left‐handed helical conformation similar to that of polyglycine II and polyproline II.