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- W2150659350 abstract "Tryptophan is an essential amino acid, and understanding the conformational preferences of monomer and dimer is a subject of outstanding relevance in biological systems. An exhaustive first principles investigation of tryptophan ( W ) and its ionized counterparts cations (WC) , anions (WA) , and zwitterions (WZ) has been carried out. A comprehensive and systematic study of tryptophan dimer (WD) conformations resulted in about 62 distinct minima on the potential energy surface. The hydrogen bonds and a variety of noncovalent interactions such as OH‐π, NH‐π, CH‐π, CH‐O, and π‐π interactions stabilized different forms of tryptophan and its dimers. Over all in monomeric conformers which have NH‐O, hydrogen bonds showed higher stability than other conformers. A cursory analysis reveal that the most stable dimers stabilized by hydrogen bonding interactions while the less stable dimers showed aromatic side chain interactions. Protein Data Bank analysis of tryptophan dimers reveals that at a larger distance greater than 5 Å, T‐shaped orientations (CH‐π interactions) are more prevalent, while stacked orientations (π‐π interactions) are predominant at a smaller distance. © 2013 Wiley Periodicals, Inc." @default.
- W2150659350 created "2016-06-24" @default.
- W2150659350 creator A5042534009 @default.
- W2150659350 creator A5034583426 @default.
- W2150659350 date "2013-11-01" @default.
- W2150659350 modified "2023-10-09" @default.
- W2150659350 title "A comprehensive conformational analysis of tryptophan, its ionic and dimeric forms" @default.
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- W2150659350 doi "https://doi.org/10.1002/jcc.23482" @default.
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