Multiple Conformational States in Crystals and in Solution in αγ Hybrid Peptides. Fragility of the C<sub>12</sub> Helix in Short Sequences
作者:Sunanda Chatterjee、Prema G. Vasudev、Kuppanna Ananda、Srinivasarao Raghothama、Narayanaswamy Shamala、Padmanabhan Balaram
DOI:10.1021/jo8009819
日期:2008.9.1
established in the peptides Boc-Aib-Gpn-Aib-OMe and Boc-Gpn-Aib-NHMe, respectively. Selective line broadening of NH resonances and the observation of medium range NH(i) <--> NH(i+2) NOEs established the presence of conformational heterogeneity for the tetrapeptide in CDCl3 solution. The NMR results are consistent with the limited population of the continuous C12 helix conformation. Lengthening of the