Aqueous solutions containing amino acids and peptides. Part 13.—Enthalpy of dilution and osmotic coefficients of some N-acetyl amino acid amides and some N-acetyl peptide amides at 298.15 K
作者:G. Michael Blackburn、Terence H. Lilley、Elizabeth Walmsley
DOI:10.1039/f19827801641
日期:——
The energetics of the interactions occurring between some N-acetyl aminoacid amides and some N-acetyl peptide amides in aqueoussolutions at 298.15K have been investigated. Osmotic coefficients of solutionscontaining N-acetylglycinamide (G), N-acetyl-L-alaninamide (A) and N-acetyl-L-leucinamide (L) and equimolal solutions of G + A, G + L and A + L have been obtained using the isopiestic vapour pressure
研究了在298.15 K水溶液中某些N-乙酰基氨基酸酰胺和某些N-乙酰基肽酰胺之间相互作用的能量。含有溶液的渗透系数Ñ -acetylglycinamide(G),Ñ乙酰基大号丙氨酸酰胺(A)和Ñ乙酰基大号-leucinamide(L)和G + A的equimolal解决方案,G + L和A + L一直使用等压蒸气压技术获得。N-乙酰基甘氨酰甘氨酰胺(G 2),N-乙酰基-L-丙氨酰-L-丙氨酰胺(A 2)的稀释焓),N-乙酰基-甘氨酰甘氨酰胺(G 3),N-乙酰基-L-丙氨酰-L-丙氨酰基-L-丙氨酰胺(A 3)和N-乙酰基-L-丙氨酰甘氨酰胺(AG)以及等摩尔溶液G + G 2,G + G 3和A + A 2使用微量量热法获得。获得的结果用于计算成对的溶质相互作用和成对的溶质相互作用的成对自由能和焓参数。考虑了分子结构和取代对这些参数的影响,并研究了基团相互作用方法的效率。对于最有限的
Folding of an Ala-Ala-Ala Tripeptide into a β-Turn via Hydrophobic Encapsulation
An Ac-Ala-Ala-Ala-NH2 tripeptide was folded into a β-turn structure even in water through hydrophobic binding by a self-assembled porphyrin cage. The turn conformation of the bound peptide was fully assigned from NOESY measurements and was strongly supported by molecular dynamics simulation. Single mutation experiments and molecular modeling also suggested that CH−π interactions between methyl groups