吉林大学学报(理学版) ›› 2025, Vol. 63 ›› Issue (4): 1192-1204.

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生理环境下双α-Ala螯合Ca(Ⅱ)手性转变的密度泛函理论

姜春旭1, 张雪娇1, 赵宇1, 陈静思2, 吴铁丽3, 王佐成4, 杨应1   

  1. 1. 白城师范学院 理论计算中心, 吉林 白城 137000;   
    2. 白城医学高等专科学校 临床医学院, 吉林 白城 137000;
    3.  齐齐哈尔市龙沙区医联门诊部,  黑龙江 齐齐哈尔  161000;  
    4. 海南科技职业大学 医药学院, 海口 571126
  • 收稿日期:2024-10-15 出版日期:2025-07-26 发布日期:2025-07-26
  • 通讯作者: 王佐成 E-mail:wangzc188@163.com

DFT  of  Chiral Transition of Bis-α-Ala Chelated Ca(Ⅱ) in Physiological Environment

JIANG Chunxu1,  ZHANG Xuejiao1,  ZHAO Yu1,  CHEN Jingsi2,  WU Tieli3,  WANG Zuocheng4,  YANG Ying1   

  1. 1. Theoretical Computing Center,  Baicheng Normal University, Baicheng 137000, Jilin Province, China; 
    2. College of Clinical Medicine,  Baicheng Medical College,  Baicheng 137000,  Jilin Province,  China; 
    3. Medical Outpatient Department of Longsha District of   Qiqihar,  Qiqihar  161000,  Heilongjiang Province,  China; 
    4. Collegel of Medicine, Hainan Vocational University of Science and Technology, Haikou 571126, China
  • Received:2024-10-15 Online:2025-07-26 Published:2025-07-26

摘要: 采用密度泛函理论(DFT)的M06-2X和MN15方法, 研究双α-丙氨酸螯合Ca(Ⅱ)配合物(α-Ala)2→Ca(Ⅱ)的手性转变机理. 结果表明, (S-α-Ala)2→Ca(Ⅱ)的手性转变经历2个过程: 首先, (S-α-Ala)2→Ca(Ⅱ)中的一个α-Ala从S型异构成R型, 得到R-异α-Ala钙(R-allo-α-Ala→Ca(Ⅱ)); 其次, R-allo-α-Ala→Ca(Ⅱ)中的S-α-Ala再异构成R-α-Ala, 得到(R-α-Ala)2→Ca(Ⅱ). 在隐性溶剂效应下, (S-α-Ala)2→Ca(Ⅱ)异构成R-allo-α-Ala→Ca(Ⅱ)的速控步能垒为221.5 kJ/mol, 由H自手性C向N转移的过渡态产生, 显性溶剂效应下该能垒降至93.1 kJ/mol;  R-allo-α-Ala→Ca(Ⅱ)异构成(R-α-Ala)2→Ca(Ⅱ)的速控步能垒为233.8 kJ/mol, 由H自手性C向N转移的过渡态产生, 显性溶剂效应下该能垒降至116.7 kJ/mol.  因此, 生理环境下(S-α-Ala)2→Ca(Ⅱ)的手性转变速率很慢, 双α-Ala螯合钙可安全用于生命体补充钙元素和α-Ala. 

关键词: 二价钙, α-丙氨酸, 手性转变, 密度泛函, 自洽反应场, 过渡态, 自由能垒

Abstract: We studied the chiral transition mechanism of the bis-α-alanine chelating Ca(Ⅱ) complex (α-Ala)2→Ca(Ⅱ)  by using the M06-2X and MN15 methods of density functional theory (DFT). The results show that the chiral transition of (S-α-Ala)2→Ca(Ⅱ) undergoes  two processes:  Firstly,  one of the α-Ala in (S-α-Ala)2→Ca(Ⅱ) isomerizes from the S-type to the R-type to obtain R-allo-α-Ala→Ca(Ⅱ).  Secondly,  the S-α-Ala in R-allo-α-Ala→Ca(Ⅱ) isomerizes again to R-α-Ala to obtain (R-α-Ala)2→Ca(Ⅱ).   The free energy barrier for the (S-α-Ala)2→Ca(Ⅱ) isomerization to the R-allo-α-Ala→Ca(Ⅱ) tachycritical step under the implicit aqueous solvent  is 221.5 kJ/mol from the transition state where the H proton migrates from the chiral C atom to the  N atom, the free energy barrier drops to 93.1 kJ/mol in dominant aqueous solvent. The free energy barrier for the R-allo-α-Ala→Ca(Ⅱ) isomerization to (R-α-Ala)2→Ca(Ⅱ) tachycritical step is 233.8 kJ/mol for the implicit aqueous solvent  from the transition state where the H proton  migrates from the chiral C atom to the  N atom, the free energy barrier  drops to 116.7 kJ/mol in the dominant aqueous solvent. Therefore,  the chiral transition rate of (S-α-Ala)2→Ca(Ⅱ) is slow in physiological environments,  and   bis-α-Ala chelate calcium can be safely used for supplementation of living organisms with elemental calcium and α-Ala.

Key words: divalent calcium,  , α-alanine,  , chiral transition,  , density functional,  , self-consistent reaction field,  , transition state,  , free energy barrier

中图分类号: 

  • O641.12