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.
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.
DFT study on the enantiotropy of amphoteric His molecule in water-liquid phase environment
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.
关键词
组氨酸对映异构密度泛函理论过渡态吉布斯自由能垒
Keywords
histidineenantiotropydensity functional theorytransition stateGibbs free energy
BIEGLER-KÖNIG F, SCHÖNBOHM J, DERDAU R, et al, 2002. AIM 2000, Version 2.0[CP]. Hamilton:McMaster University.
FRISCH M J, TRUCKS G W, SCHLEGEL H B, et al, 2019. Gaussian 16 Revision C.01[CP]. Pittsburgh: Gaussian, Inc.
GARRETT B C, TRUHLAR D G, 1979. Criterion of minimum state density in the transition state theory of bimolecular reactions[J]. J Chem Phys, 70(4): 1593-1598.
GLENDENING E D, BADENHOOP J K, REED A E, et al, 2001. NBO 5.0 [CP]. Madison, WI: University of Wisconsin.
HRATCHIAN H P, SCHLEGEL H B, 2005. Using hessian updating to increase the efficiency of a hessian based predictor-corrector reaction path following method[J]. J Chem Theory Comput, 1(1): 61-69.
MARENICH A V, CRAMER C J, TRUHLAR D G, 2009. Universal solvation model based on solute electron density and on a continuum model of the solvent defined by the bulk dielectric constant and atomic surface tensions[J]. J Phys Chem B, 113(18): 6378-6396.
TONG H, LIU Y F, YAN H, et al, 2019. Theoretical investigation of the chiral transition of serine and the roles of water, hydroxyl radical and hydroxide ion[J]. New J Chem, 43(31): 12340-12350.
YU H S, HE X, LI S L, et al, 2016. MN15: A Kohn-Sham global-hybrid exchange-correlation density functional with broad accuracy for multi-reference and single-reference systems and noncovalent interactions[J]. Chem Sci, 7(8): 5032-5051.
ZHAO Y, TRUHLAR D G, 2008. The M06 suite of density functionals for main group thermochemistry, thermochemical kinetics, noncovalent interactions, excited states, and transition elements: Two new functionals and systematic testing of four M06-class functionals and 12 other functionals[J]. Theor Chem Account, 120(1): 215-241.