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Burman M, Bag S, Ghosal S, Mukherjee M, Pramanik G, Bhowmik S. Revealing the Improved Binding Interaction of Plant Alkaloid Harmaline with Human Hemoglobin in Molecular Crowding Condition. ACS OMEGA 2024; 9:21668-21679. [PMID: 38764694 PMCID: PMC11097346 DOI: 10.1021/acsomega.4c02766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2024] [Revised: 04/22/2024] [Accepted: 04/25/2024] [Indexed: 05/21/2024]
Abstract
Harmaline and harmine are two structurally similar β-carboline alkaloids with several therapeutic activities, such as anti-inflammatory, antioxidant, neuroprotective, nephroprotective, antidiabetic, and antitumor activities. It has been previously reported that the interaction between harmaline and hemoglobin (Hb) is weak in buffer media compared to harmine. Crowding agents induce a molecular crowding environment in the ex vivo condition, which is almost similar to the intracellular environment. In this present study, we have investigated the nature of the interactions of harmaline and harmine with Hb by increasing the percentage of the crowding agent in buffer solution. The results of the UV-vis and fluorescence spectroscopy analysis have showed that with an increasing proportion of crowding agents, the interaction between harmaline and Hb is steadily improving in comparison to harmine. It has been found that the binding constant of Hb-harmaline reaches 6.82 × 105 M-1 in the 40% polyethylene glycol 200-mediated crowding condition, indicating high affinity compared to very low interaction in buffer media. Steady-state fluorescence anisotropy along with fluorescence lifetime measurements further revealed that the rotational movement of harmaline is maximally restricted by Hb in high crowding environments. Stoichiometry results represent that Hb and harmaline interacts in a 1:1 ratio in different percentages of the crowding agent. The circular dichroism spectroscopic results predict stronger interaction of harmaline with Hb (secondary structure alterations) in a higher crowding environment. From the melting study, it was found that the reactions between Hb and harmaline in crowding environments are endothermic (ΔH > 0) and disordering (ΔS > 0) in nature, indicating that hydrogen bonding and van der Waals interactions are the main interacting forces between Hb and harmaline. Harmaline molecules are more reactive in molecular crowding conditions than in normal buffer condition. This study represents that the interaction between harmaline and Hb is stronger compared to the structurally similar harmine in a molecular crowding environment, which may enlighten the drug discovery process in cell-mimicking conditions.
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Affiliation(s)
- Mangal
Deep Burman
- Department
of Biophysics, Molecular Biology and Bioinformatics, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
| | - Sagar Bag
- Department
of Biophysics, Molecular Biology and Bioinformatics, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
| | - Souvik Ghosal
- Mahatma
Gandhi Medical Advanced Research Institute (MGMARI), Sri Balaji Vidyapeeth (Deemed to be University), Pondy−Cuddalore Main Road, Pillaiyarkuppam, Pondicherry 607402, India
| | - Moupriya Mukherjee
- UGC-DAE
Consortium for Scientific Research, Kolkata Centre, Sector III, LB-8, Bidhan Nagar, Kolkata 700 106, India
| | - Goutam Pramanik
- UGC-DAE
Consortium for Scientific Research, Kolkata Centre, Sector III, LB-8, Bidhan Nagar, Kolkata 700 106, India
| | - Sudipta Bhowmik
- Department
of Biophysics, Molecular Biology and Bioinformatics, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
- Mahatma
Gandhi Medical Advanced Research Institute (MGMARI), Sri Balaji Vidyapeeth (Deemed to be University), Pondy−Cuddalore Main Road, Pillaiyarkuppam, Pondicherry 607402, India
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Sun J, Wang X, Nie Z, Ma L, Sai H, Cheng J, Liu Y, Duan J. Characterization of the interactions between Fulvic acid and Trypsin with Spectroscopic and Molecular Docking technology. Chem Biodivers 2024; 21:e202301366. [PMID: 38073179 DOI: 10.1002/cbdv.202301366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 12/10/2023] [Indexed: 01/13/2024]
Abstract
The interaction mechanism between trypsin and fulvic acid was analyzed by multispectral method and molecular docking simulation. The fluorescence spectra showed that fulvic acid induced static quenching of trypsin. The validity of this conclusion was further substantiated through the computation of the binding constants. The thermodynamic parameters show that the reaction is mainly controlled by van der Waals force and hydrogen bond force, and the reaction is spontaneous. In addition, based on the obtained binding distance, there may be a non-radiative energy transfer between the two. The ultraviolet spectrum showed that fulvic acid could shift the absorption peak of trypsin, indicating that fulvic acid had an effect on the secondary structure of trypsin. According to the synchronous fluorescence spectrum results, fulvic acid primarily interacts with tryptophan residues in trypsin and induces alterations in their microenvironment. Three-dimensional fluorescence spectrum and circular dichroism further proves this conclusion. The molecular docking simulation reveals that the interaction between the two groups primarily arises from hydrogen bonding and van der Waals forces. The findings suggest that FA has the ability to induce conformational changes in trypsin's secondary structure.
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Affiliation(s)
- Jisheng Sun
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
| | - Xiaoxia Wang
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
- Innermongolia Engineering Research Center of Comprehensive Utilization of Bio-coal Chemical Industry, Baotou, 014010, China
| | - Zhihua Nie
- School of life sciences, Tsinghua University, Beijing, 100084, China
| | - Litong Ma
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
- Innermongolia Engineering Research Center of Comprehensive Utilization of Bio-coal Chemical Industry, Baotou, 014010, China
| | - Huazheng Sai
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
| | - Jianguo Cheng
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
| | - Yunying Liu
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
| | - Jianguo Duan
- School of Chemistry and Chemical Engineering, Inner Mongolia University of Science and Technology, Baotou, 014010, China
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