Add time:09/03/2019         Source:sciencedirect.com

The conformational space of β-turns of Ala-Gly dipeptide is analyzed theoretically using quantum mechanical methods. A number of potential minima are obtained and characterized. The potential energy surface suggests that β-turn conformers are susceptible to rapid radical formation, which leads to potential L and D epimerization. The calculated thermodynamics show that the radical mediated epimerization is possible and that the estimated barrier height for hydrogen abstraction on the Cα is the lowest for the Gly residue.

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