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Rashtbari S, Dehghan G, Sadeghi L, Sareminia L, Iranshahy M, Iranshahi M, Khataee A, Yoon Y. Interaction of bovine serum albumin with ellagic acid and urolithins A and B: Insights from surface plasmon resonance, fluorescence, and molecular docking techniques. Food Chem Toxicol 2022; 162:112913. [PMID: 35276234 DOI: 10.1016/j.fct.2022.112913] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 02/22/2022] [Accepted: 03/06/2022] [Indexed: 12/14/2022]
Abstract
Human serum albumin (HSA) shows the sequence homology and structural similarity with bovine serum albumin (BSA). Therefore, here, the interaction of natural phenolic antioxidants, ellagic acid (ELA), and its derivatives-urolithins A (ULA) and B (ULB)-with BSA was investigated. The results of surface plasmon resonance (SPR) indicated a high affinity of ELA, ULA, and ULB to BSA, with KD value < 1 × 10-6 M. The KD values of binding of the studied compounds to BSA increased with temperature, revealing a reduction in affinity with an increase in temperature. Fluorescence data showed that the quenching of BSA by tested compounds occurred via a static quenching. However, the affinity of ELA for BSA was higher than that of ULA and ULB, which may be because of the presence of a large number of hydroxyl groups in its structure. The assessment of the antioxidant activity of BSA and BSA-ELA/ULA/ULB complexes using the DPPH assay indicated that the DPPH scavenging activity of BSA increased after complex formation with ELA/ULA/ULB in the following order: BSA-ELA > BSA-ULA > BSA-ULB > BSA, which was due to their structural differences. The results of the docking analysis were in agreement with the experimental results.
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Affiliation(s)
- Samaneh Rashtbari
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471, Tabriz, Iran
| | - Gholamreza Dehghan
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471, Tabriz, Iran.
| | - Leila Sadeghi
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471, Tabriz, Iran
| | - Leila Sareminia
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, 51666-16471, Tabriz, Iran
| | - Milad Iranshahy
- Department of Pharmacognosy, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mehrdad Iranshahi
- Biotechnology Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Alireza Khataee
- Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran; Department of Environmental Engineering, Faculty of Engineering, Gebze Technical University, 41400, Gebze, Turkey
| | - Yeojoon Yoon
- Department of Environmental and Energy Engineering, Yonsei University, Wonju, Republic of Korea.
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Yekta R, Sadeghi L, Dehghan G. The role of non-enzymatic glycation on Tau-DNA interactions: Kinetic and mechanistic approaches. Int J Biol Macromol 2022; 207:161-168. [PMID: 35257729 DOI: 10.1016/j.ijbiomac.2022.02.178] [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: 11/07/2021] [Revised: 12/26/2021] [Accepted: 02/27/2022] [Indexed: 11/05/2022]
Abstract
Despite the regulatory role of Tau protein in the stabilization and assembly of microtubules, this protein has an important function in the protection and stabilizing of DNA molecules in the cell nucleus. In the present study, it has been indicated that glycation of lysine residues (Lys-267, Lys-274, and Lys-280) in the microtubule-binding domain (MBD) can considerably decrease its binding affinity to DNA molecules. The structural analysis also confirmed that the decreased glycated tau-DNA complex's stability was due to structural modification of this protein after the glycation process. The study of hippocampal cells under hyperglycemic conditions showed that near to 70% of Tau proteins glycated in these cells, although the expression of Tau remained unaffected. The assessment of H3K9me2, as a marker for binding of Tau to pericentromeric heterochromatin (PCH), indicated that localization of Tau protein on PCH was remarkably decreased at high glucose conditions relative to the controls. It is suggested that increasing the structural stability of Tau protein limits the ability of this protein for DNA binding, while the molecular and physical barrier of glycated Lys residues should not be neglected.
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Affiliation(s)
- Reza Yekta
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
| | - Leila Sadeghi
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran..
| | - Gholamreza Dehghan
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran..
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The impact of caffeine on tau-tau interaction: LSPR detection, structural modification and molecular dynamics simulation. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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