1.白城医学高等专科学校基础医学院,吉林 白城 137000
2.白城师范学院理论计算中心,吉林 白城 137000
赵丽红(1970年生),女;研究方向:药物化学;E-mail:zhaolihong@bcmc.edu.cn
姜春旭(1988年生),男;研究方向:计算机应用化学;E-mail:jcx@bcnu.edu.cn
王佐成(1963年生),男;研究方向:计算化学;E-mail:wzc@bcnu.edu.cn
纸质出版日期:2023-11-25,
网络出版日期:2023-02-20,
收稿日期:2022-11-10,
录用日期:2023-02-02
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赵丽红,彭国强,郝成欣等.水溶液环境下手性配合物Phe·Ca2+对映异构机理的DFT研究[J].中山大学学报(自然科学版),2023,62(06):50-60.
ZHAO Lihong,PENG Guoqiang,HAO Chengxin,et al.The DFT study on the isomerization mechanism of chiral complexes Phe·Ca2+ in aqueous solution[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(06):50-60.
赵丽红,彭国强,郝成欣等.水溶液环境下手性配合物Phe·Ca2+对映异构机理的DFT研究[J].中山大学学报(自然科学版),2023,62(06):50-60. DOI: 10.13471/j.cnki.acta.snus.2022C023.
ZHAO Lihong,PENG Guoqiang,HAO Chengxin,et al.The DFT study on the isomerization mechanism of chiral complexes Phe·Ca2+ in aqueous solution[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(06):50-60. DOI: 10.13471/j.cnki.acta.snus.2022C023.
采用DFT(density functional theory)的M06-2X、MN15方法和处理溶剂效应的SMD模型方法,研究了水溶液中
S
-苯丙氨酸(
S
-Phe)与二价钙(Ca
2+
)配合物(Phe·Ca
2+
)的对映异构。反应通道研究发现,
S
-Phe·Ca
2+
的对映异构可在质子以N和O分别为桥以及O和N联合为桥迁移的3个通道上实现。计算表明:最优势通道是质子以N为桥迁移,隐性水溶剂效应下决速步自由能垒是227.5 kJ/mol,显性水溶剂效应下该能垒降至108.0~117.6 kJ/mol。结果表明:水溶液中手性Phe·Ca
2+
的消旋过程十分缓慢,将其用于生命体同补苯丙氨酸和钙元素可能比较安全。
The enantiomerism of amphoteric phenylalanine (
S
-Phe) with divalent calcium (Ca
2+
) complex (Phe·Ca
2+
) in aqueous solution was studied by using M06-2X and MN15 methods based on DFT (density functional theory) and SMD model method to deal with solvent effect. The study of reaction channel found that enantiomerism of
S
-Phe·Ca
2+
can be realized on three channels in which protons use N as bridge, O as bridge , O and N combine to form a bridge. The calculation shows that the reaction channel of H proton transfer with amino N as bridge has advantages under the effect of recessive solvent and its energy barrier is 227.5 kJ/mol, and the barrier is reduced to between 108.0 and 117.6 kJ/mol under the dominant solvent effect. According to the research results, chiral Phe·Ca
2+
complex is hard to racemize in aqueous solution, and it might be safer to be used for life supplementing phenylalanine and calcium.
苯丙氨酸二价钙DFT(density functional theory)对映异构自由能垒
phenylalaninecalcium ion (Ca2+)DFT(density functional theory)optical isomerismenergy barrier
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