Partial molar heat capacities and volumes of aqueous solutions of some peptides that model side-chains of proteins
作者:Gavin R. Hedwig
DOI:10.1039/ft9938902761
日期:——
The partial molar volumes, V∞2, and partial molar heat capacities, C∞p, 2, at infinite dilution have been determined for the tripeptides glycyl-L-isoleucylglycine, glycyl-DL-threonylglycine, glycyl-L-asparagylglycine, glycyl-histidylglycine, glycylmethionylglycine and glycylphenylalanylglycine in aqueous solution at 25 °C. These results, in conjunction with those for glycylglycylglycine, were used to estimate the amino acid side-chain contributions to V∞2 and C∞p, 2. The side-chain contributions are compared with those determined using other model compounds. For some side-chains the heat capacities were found to correlate well with the side-chain non-polar surface areas.
测定了甘氨酰-L-异亮氨酰甘氨酸、甘氨酰-L-天冬氨酰甘氨酸、甘氨酰-组氨酰甘氨酸、甘氨酰-蛋氨酰甘氨酸和甘氨酰-DL-苏氨酰甘氨酸三肽在无限稀释时的部分摩尔体积 V∞2 和部分摩尔热容量 C∞p, 2、甘氨酰-L-异亮氨酰甘氨酸、甘氨酰-DL-苏氨酰甘氨酸、甘氨酰-L-天冬氨酰甘氨酸、甘氨酰-组氨酰甘氨酸、甘氨酰-蛋氨酰甘氨酸和甘氨酰-苯丙氨酰甘氨酸在 25 °C 水溶液中的热容量。这些结果以及甘氨酰甘氨酸的结果被用来估算氨基酸侧链对 V∞2 和 C∞p, 2 的贡献。发现某些侧链的热容量与侧链的非极性表面积密切相关。