Abstract
Molecular dynamics simulations carried out on short linear peptides incorporating β-Ala residues, namely Boc–β–Ala–Phe–OMe (1) and Boc–Met–β–Ala–Phe–OMe (2), reveal a markedly different conformational-dynamical behaviour. The tripeptide (2), showing free energy minima deeper than the dipeptide is predicted to be characterized by long-lived conformers. The present theoretical results may help in rationalizing experimental (IR, NMR) results on (1) and (2) and definitely show the importance of a dynamical approach for a correct interpretation and prediction of the conformational behaviour in solution even for relatively small molecules.
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