Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 14, Pages 3463-3473Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b921897a
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Funding
- Engineering and Physical Sciences Research Council [GR/R63196/01, GR/S06233/01, GR/R94466]
- Royal Society
- ChemReact Computer Consortium
- EaStCHEM via the EaStCHEM Research Computing Facility
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The structural preferences of the neutral gas-phase glycine tripeptide have been investigated using a variety of strategies including a hierarchy of electronic structure theory (encompassing HF/3-21G single-point energy calculation and geometry optimisation, B3LYP/6-31G(d) geometry optimisation and MP2/6-31+G(d) single-point energy calculation and/or geometry optimisation). The structures and relative stabilities of the 20 most stable conformers identified were verified by M05-2X and mPW2-PLYP-D calculations. The most stable conformer located has a folded g-turn structure, with an NH center dot center dot center dot N interaction between the N-terminal nitrogen and the amide hydrogen of glycine (2) and an NH center dot center dot center dot O interaction between the amide hydrogen of glycine (3) and the carboxyl oxygen of glycine (1). The results show a clear preference for folded over extended structures.
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