Abstract
Background: ALDH-2 has been considered an important molecular target for the treatment of drug addiction due to its involvement in the metabolism of the neurotransmitter dopamine: however, the molecular basis for the selective inhibition of ALDH-2 versus ALDH-1 should be better investigated to enable a more pragmatic approach to the design of novel ALDH-2 selective inhibitors.
Objective: In the present study, we investigated the molecular basis for the selective inhibition of ALDH-2 by the antioxidant isoflavonoid daidzin (IC50 = 0.15 μM) compared to isoform 1 of ALDH through molecular dynamics studies and semiempirical calculations of the enthalpy of interaction.
Methods: The applied methodology consisted of performing the molecular docking of daidzin in the structures of ALDH-1 and ALDH-2 and submitting the lower energy complexes obtained to semiempirical calculations and dynamic molecular simulations.
Results: Daidzin in complex with ALDH-2 presented directed and more specific interactions, resulting in stronger bonds in energetic terms and, therefore, in enthalpic gain. Moreover, the hydrophobic subunits of daidzin, in a conformationally more restricted environment (such as the catalytic site of ALDH-2), promote the better organization of the water molecules when immersed in the solvent, also resulting in an entropic gain.
Conclusion: The molecular basis of selective inhibition of ALDH-2 by isoflavonoids and related compounds could be related to a more favorable equilibrium relationship between enthalpic and entropic features. The results described herein expand the available knowledge regarding the physiopathological and therapeutic mechanisms associated with drug addiction.
Keywords: ALDH-2, molecular dynamics, daidzin, selective inhibition, isoflavonoids, nucleus accumbens.
Graphical Abstract
[PMID: 28366975]
[http://dx.doi.org/10.1016/j.neuron.2011.01.027] [PMID: 21338873]
[http://dx.doi.org/10.1080/10673220490910844] [PMID: 15764467]
[http://dx.doi.org/10.1111/acer.12810] [PMID: 26431116]
[http://dx.doi.org/10.1016/j.neubiorev.2013.10.002] [PMID: 24140399]
[http://dx.doi.org/10.1016/j.ejphar.2005.09.038] [PMID: 16253234]
[http://dx.doi.org/10.1038/s41398-019-0591-6 ] [PMID: 31594920]
[http://dx.doi.org/10.1002/med.10049] [PMID: 12939789]
[http://dx.doi.org/10.1021/jm800488j] [PMID: 18613661]
[http://dx.doi.org/10.1111/j.1530-0277.2009.01031.x] [PMID: 19673742]
[http://dx.doi.org/10.1081/DMR-120034001] [PMID: 15237855]
[http://dx.doi.org/10.1021/tx2005184] [PMID: 22339434]
[http://dx.doi.org/10.1046/j.1432-1327.1998.2510549.x] [PMID: 9490025]
[http://dx.doi.org/10.2741/1589]
[http://dx.doi.org/10.1517/17425255.4.6.697] [PMID: 18611112]
[http://dx.doi.org/10.1152/physrev.00017.2013] [PMID: 24382882]
[http://dx.doi.org/10.1002/wcms.1323]
[http://dx.doi.org/10.1038/nm.2200] [PMID: 20729865]
[http://dx.doi.org/10.1002/neu.20242] [PMID: 16688755]
[http://dx.doi.org/10.1073/pnas.90.4.1247] [PMID: 8433985]
[http://dx.doi.org/10.1021/bi00001a028] [PMID: 7819202]
[http://dx.doi.org/10.1186/1758-2946-1-15] [PMID: 20150996]
[http://dx.doi.org/10.1063/1.4985605] [PMID: 29096452]
[http://dx.doi.org/10.1021/jm501900s] [PMID: 25634381]
[http://dx.doi.org/10.1006/jmbi.1996.0897] [PMID: 9126849]
[http://dx.doi.org/10.1002/(SICI)1096-987X(19981115)19:14<1639:AID-JCC10>3.0.CO;2-B]
[http://dx.doi.org/10.1038/nrd1549] [PMID: 15520816]
[http://dx.doi.org/10.4161/bioe.23041] [PMID: 23222169]
[http://dx.doi.org/10.1021/ci800298z] [PMID: 19125657]
[http://dx.doi.org/10.1110/ps.8.12.2784] [PMID: 10631996]
[http://dx.doi.org/10.1007/s00894-012-1667-x] [PMID: 23187683]
[http://dx.doi.org/10.1002/jcc.20291] [PMID: 16211538]
[http://dx.doi.org/10.1021/ja9621760]
[http://dx.doi.org/10.1021/jp003919d]
[http://dx.doi.org/10.1021/acs.jctc.5b00356] [PMID: 26190950]
[http://dx.doi.org/10.1021/ja00344a001]
[http://dx.doi.org/10.1006/hmat.1996.2146]
[http://dx.doi.org/10.6028/jres.049.044]
[http://dx.doi.org/10.1090/S0025-5718-1980-0572855-7]
[http://dx.doi.org/10.1007/s00894-008-0316-x] [PMID: 18481119]
[http://dx.doi.org/10.1063/1.447221]
[http://dx.doi.org/10.1021/ct700200b] [PMID: 26619985]
[http://dx.doi.org/10.1063/1.470117]