Conformational Manifold of α-Aminoisobutyric Acid (Aib) Containing Alanine-Based Tripeptides in Aqueous Solution Explored by Vibrational Spectroscopy, Electronic Circular Dichroism Spectroscopy, and Molecular Dynamics Simulations
作者:Reinhard Schweitzer-Stenner、Widalys Gonzales、Gregory T. Bourne、Jianwen A. Feng、Garland R. Marshall
DOI:10.1021/ja0738430
日期:2007.10.1
but its conformational equilibrium was shifted towards helical conformations in Ac-Aib-Ala-Ala-OMe, indicating that Aib can induce helical conformations of neighboring residues positioned towards the C-terminal direction of the peptide. An energy landscape exploration by molecular dynamics simulations corroborated the results of the spectroscopicstudies. They also revealed the dynamics and pathways
The critical main-chain length for helix formation in water: Determined in a peptide series with alternating Aib and Ala residues exclusively and detected with ECD spectroscopy
characterized only by alternatingAib and Alaresidues, from the dimer to the nonamer level. All these compounds were investigated by electronic circular dichroism in the far‐UV region in water solution as a function of chemical structure, namely presence/absence of an ester moiety or a negative charge at the C‐terminus, and temperature. We find that the critical main‐chain lengths for 310‐ and α‐helices