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Chen H, Zhu T, Sun L, Xiang L, Han H, Luo X, Chen D. Investigation of atropisomeric transformation of a novel PDE4 inhibitor with tetrahydroisoquinoline-based amide group and its primary study of binding to HSA. J Pharm Biomed Anal 2022; 221:115056. [PMID: 36150299 DOI: 10.1016/j.jpba.2022.115056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 09/10/2022] [Accepted: 09/13/2022] [Indexed: 11/29/2022]
Abstract
In this study a kinetic and thermodynamic atropisomeric transformation due to a hindered rotation around the tetrahydroisoquinoline-based amide group was investigated. Quantum chemistry calculations were applied to investigate the transformation under the gas phase and several solvents with different polarity, and then evaluated by dynamic HPLC determination. It was found that the transformation rate of constants and the half-life time varied under the influence of solvent polarity and temperature and the energies of rotational barrier were determined ranging between 87 and 92 kJ∙mol-1. A primary binding study with HSA confirmed a rapid interconversion under the simulated physiological conditions. It is therefore suggested to take this atropisomeric compound as a racemic mixture for its future drug development.
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Affiliation(s)
- Huanhuan Chen
- Laboratory of Pharmaceutical Analysis, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tingfei Zhu
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ling Sun
- Laboratory of Pharmaceutical Analysis, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China.
| | - Lili Xiang
- Laboratory of Pharmaceutical Analysis, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China.
| | - Haiyun Han
- Laboratory of Pharmaceutical Analysis, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China.
| | - Xiaomin Luo
- Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Dongying Chen
- Laboratory of Pharmaceutical Analysis, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Rd. Zuchongzhi, Zhangjiang Hi-Tech Park, Shanghai 201203, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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Jiang H, Wang X, Cui X. Two distinct conformers of SAG investigated by solution NMR and variable-temperature experiments. J Pharm Biomed Anal 2019; 166:83-89. [PMID: 30639932 DOI: 10.1016/j.jpba.2018.12.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Revised: 12/10/2018] [Accepted: 12/11/2018] [Indexed: 10/27/2022]
Abstract
SAG (Smo agonist) is high specific agonist of Smo receptor, it is widely used as chemical probe to explore the therapeutic value of activating the Hh-signaling pathway. In the present work, the coexistence of two distinct conformers (A and B) of SAG are revealed by solution NMR, the 3D structural difference of the two conformers are elucidated by ROESY spectroscopy and MMFF94 program. It is discovered that both conformers are agonists of Smo receptor, and the minor conformer (conformer B) in D2O solution has higher affinity to Smo receptor by molecular docking. The result showed the detail about two distinct conformers of SAG are involved in activation of Smo receptor, and also provides information for designing more effective agonist of Smo by mimicking B conformer of SAG. By exchange dynamics investigation using variable-temperature NMR experiments, the ratio of two conformers has been shown to be drastically solvent dependent, so, the menstruum type is another important influence factor of SAG bioactivity, when using SAG as chemical probe.
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Affiliation(s)
- Haipeng Jiang
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan 430074, China.
| | - Xian Wang
- Key Laboratory of Analytical Chemistry of State Ethnic Affairs Commission, College of Chemistry and Materials Science, South-Central University for Nationalities, Wuhan 430074, PR China.
| | - Xiaoliang Cui
- Wuhan Sun-Shine Bio-Technology Corporation Limited, Wuhan, 430223, PR China
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Alver Ö, Bilge M, Atar N, Parlak C, Şenyel M. Interaction mechanisms and structural properties of MC19 (M = Si and Al) fullerenes with chlorophenylpiperazine isomers. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.01.100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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