1.白城医学高等专科学校医学技术学院,吉林 白城 137000
2.白城师范学院理论计算中心,吉林 白城 137000
牛鹤丽(1980年生),女;研究方向:生物化学;E-mail:nhl@bcmc.edu.cn
姜春旭(1988年生),男;研究方向:计算化学;E-mail:jcx@bcnu.edu.cn
杨晓翠(1965年生),女;研究方向:计算化学;E-mail:yxc@bcnu.edu.cn
纸质出版日期:2024-03-25,
网络出版日期:2023-12-05,
收稿日期:2023-07-21,
录用日期:2023-11-03
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牛鹤丽,徐岩,杨应等.水液相下两性组氨酸分子对映异构的密度泛函理论[J].中山大学学报(自然科学版)(中英文),2024,63(02):168-180.
NIU Heli,XU Yan,YANG Ying,et al.DFT study on the enantiotropy of amphoteric His molecule in water-liquid phase environment[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(02):168-180.
牛鹤丽,徐岩,杨应等.水液相下两性组氨酸分子对映异构的密度泛函理论[J].中山大学学报(自然科学版)(中英文),2024,63(02):168-180. DOI: 10.13471/j.cnki.acta.snus.2023C008.
NIU Heli,XU Yan,YANG Ying,et al.DFT study on the enantiotropy of amphoteric His molecule in water-liquid phase environment[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(02):168-180. DOI: 10.13471/j.cnki.acta.snus.2023C008.
采用DFT的M06-2X和MN15杂化泛函方法,结合处理溶剂效应的SMD模型方法,对标题反应进行研究。研究发现:His分子可在
α
-H质子以羧基(质子化的)下面的O为桥迁移;H质子从氨基(质子化的)N迁移到质子化羧基上面的O后,
α
-H再以N和羧基(质子化的)下面的O分别为桥迁移;质子从氨基(质子化的)N迁移到咪唑环上的N后,
α
-H再以氨基(质子化的)N和羧基(质子化的)下面的O分别为桥迁移5个反应通道实现对映异构。势能面计算表明:隐性溶剂效应下5个通道决速步的自由能垒分别是245.6、238.1、297.3、270.9和257.7 kJ/mol;显性溶剂效应下这些能垒分别降到139.9、120.7、161.7、142.7和157.3 kJ/mol。结果表明,水液相下His只能少量的消旋,生命体补充His比较安全。
The title reaction was performed using the M06-2X and MN15 methods of DFT combined with the Slovation Model Density (SMD) model method based on self-consistent reaction field theory. The results showed that
His molecule can be transferred when the carbonyl O atom as the only bridge of
α
-H proton
and
α
-H transfers with amino group N and carbonyl O atom as bridges after the proton of protonated amino group N transfers to carbonyl O atom,respectively;Also
α
-H achieves enantiotropy in five channels using amino group N and carbonyl group O as bridges after the proton transfers from the protonated amino group N to the N of the imidazole ring,respectively. Investigation on the potential energy surface showed that the free energy barriers of rate-determining step for each of the five channels are 245.6, 238.1, 297.3, 270.9 and 257.7 kJ/mol under the effect of recessive solvent; the energy barriers are reduced to about 139.9,120.7,161.7,142.7 and 157.3 kJ/mol under the effect of dominant solvent. The results show that His can racemize with a small amount in the water-liquid environment, and it is relatively safe to be used to supply His for life.
组氨酸对映异构密度泛函理论过渡态吉布斯自由能垒
histidineenantiotropydensity functional theorytransition stateGibbs free energy
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