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Zhang T, Wu J, Wang Y, Zhang H, Zhan X. Alleviating neuronal inflammation induced by Aβ 42 in SH-SY5Y through interaction with polysialic acid-oligomannuronate conjugate. Int J Biol Macromol 2024; 276:133862. [PMID: 39013512 DOI: 10.1016/j.ijbiomac.2024.133862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 06/08/2024] [Accepted: 07/11/2024] [Indexed: 07/18/2024]
Abstract
Amyloid beta (Aβ) aggregation is one of the distinctive pathological hallmarks of Alzheimer's disease (AD). Therefore, the development of effective inhibitors against Aβ aggregate formation offers great promise for the treatment of AD. In this study, we designed a novel negatively charged functionalized conjugate aimed at inhibiting Aβ42 aggregation and attenuating neurotoxicity by grafting polysialic acid with mannuronate oligosaccharide, a biocompatible glycan extracted from seaweeds, designated as polysialic acid-mannan conjugate (PSA-MOS). ThT, biological microscopy, TEM and CD confirmed the inhibition of Aβ42 aggregation by PSA-MOS, as well as its ability to inhibit the conformational transition of Aβ42 to β-sheet. CCK-8 assay demonstrated that PSA-MOS was not cytotoxic to SH-SY5Y (p < 0.05) and promoted cell proliferation. In the Aβ42-induced SH-SY5Y injury models, PSA-MOS dose-dependently ameliorated cytotoxicity (p < 0.0001) and significantly reduced the levels of inflammatory factors of IL-1β (p < 0.0001), IL-6 (p < 0.0001) and TNF-α (p < 0.05). MD simulations demonstrated that PSA-MOS effectively impeded the α-helix to β-sheet transition of the Aβ42 monomer via electrostatic interactions with its CTR and NTR regions. These findings demonstrate the therapeutic potential of PSA-MOS as promising glycoconjugate for the treatment of AD.
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Affiliation(s)
- Tiantian Zhang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of biotechnology, Jiangnan University, Wuxi 214122, China
| | - Jianrong Wu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of biotechnology, Jiangnan University, Wuxi 214122, China.
| | - Yuying Wang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of biotechnology, Jiangnan University, Wuxi 214122, China
| | - Hongtao Zhang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of biotechnology, Jiangnan University, Wuxi 214122, China
| | - Xiaobei Zhan
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of biotechnology, Jiangnan University, Wuxi 214122, China.
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2
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Gao W, Li Y, Xu W, Mei J, Wang C, Sajjad A, Ai H. Inhibitory Mechanisms of Three Modified Small Molecules on the Misfolding of Cu
2+
‐Aβ42 Complex in Different pH Conditions: Insights from MD/QM Studies. ChemistrySelect 2022. [DOI: 10.1002/slct.202202217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Wenqi Gao
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
| | - Ye Li
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
| | - Wen Xu
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
| | - Jinfei Mei
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
| | - Chuanbo Wang
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
| | - Ahmad Sajjad
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
| | - Hongqi Ai
- School of Chemistry and Chemical Engineering University of Jinan Jinan 250022 China
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3
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Jiang L, Sun Q, Li L, Lu F, Liu F. Molecular Insights into the Inhibitory Effect of GV971 Components Derived from Marine Acidic Oligosaccharides against the Conformational Transition of Aβ42 Monomers. ACS Chem Neurosci 2021; 12:3772-3784. [PMID: 34565139 DOI: 10.1021/acschemneuro.1c00555] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
GV971 derived from marine acidic oligosaccharides has been used to cure Alzheimer's disease (AD). However, the molecular mechanism of its inhibition of the conformational transition of amyloid β-proteins (Aβ) is still unclear. Herein, molecular dynamics simulations were used to explore the molecular mechanism of the main GV971 components including DiM, TetraM, HexaM, and OctaM to inhibit the conformational conversion of the Aβ42 monomer. It is found that the GV971 components inhibit the conformational transition from α-helix to β-sheet and the hydrophobic collapse of the Aβ42 monomer. In addition, the binding energy analysis implies that both electrostatic and van der Waals interactions are beneficial to the binding of GV971 components to the Aβ42 monomer. Among them, electrostatic interactions occupy the dominant position. Moreover, the GV971 components mainly interact directly with the charged residues D1, R5, K16, and K28 by forming salt bridges and hydrogen bonds, which specifically bind to the N-terminal region of Aβ42.
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Affiliation(s)
- Luying Jiang
- Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Quancheng Sun
- Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Li Li
- College of Marine and Environmental Science, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Fuping Lu
- Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
| | - Fufeng Liu
- Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science & Technology, Tianjin 300457, P. R. China
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Mei J, Yang H, Sun B, Liu C, Ai H. Small-Molecule Targeted Aβ 42 Aggregate Degradation: Negatively Charged Small Molecules Are More Promising than the Neutral Ones. ACS Chem Neurosci 2021; 12:1197-1209. [PMID: 33687193 DOI: 10.1021/acschemneuro.1c00047] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Heavy evidence has confirmed that Aβ42 oligomers are the most neurotoxic aggregates and play a critical role in the occurrence and development of Alzheimer's disease by causing functional neuron death, cognitive damage, and dementia. Disordered Aβ42 oligomers are challenging therapeutic targets, and no drug is currently in clinical use that modifies the properties of their monomeric states. Here, a negatively charged molecule (ER), rather than the neutral TS1 one, is identified by a molecular dynamics simulation method to be more capable of binding and sequestering the intrinsically disordered amyloid-β peptide Aβ42 in its soluble pentameric state as well as its monomeric components. Results reveal that the ERs interact with Aβ and inhibit the primary nucleation pathways in its aggregation process in entropic expansion mechanism for both Aβ42 and Aβ40 oligomers but with opposite characteristics of hydrophobic surface area (HSA). The interaction between Aβ42 oligomer and either charged ER or neutral TS1/TS0 characterizes decreased HSA, and the decrease in ER-involved case is highly visible, consistent with the observations from in silico and in vitro studies. By contrast, the presence of these inhibitors causes the HSA of Aβ40 oligomer to change undetectably and there is even a bit of increase in the histidine isomerized Aβ40 oligomer. The HSA distinction between Aβ42 and Aβ40 oligomer is possibly derived from the different effects of M35-inhibitor interaction, which is analogous to the effect of M35 oxidation. In comparison with the neutral TS1/TS0 inhibitors, ER is more prone to bind the residues located in the central (β1) and C-terminal (β2) regions of Aβ42 peptide, two key nucleation regions for Aβ intramolecular folding, intermolecular aggregation, and assembly. Notably, ER can strongly bind the charged residues, such as K16, K28, D23, to greatly disturb the potential stabilizer (e.g., salt-bridge, etc.) in metastable Aβ42 oligomers and protofibrils. These results illustrate the strategy of overcoming Alzheimer's disease from inhibiting its early stage Aβ aggregation with two kinds of small molecules to alter their behavior for therapeutic purposes and strongly recommend paying more attention to the engineering and development of negatively charged inhibitors, the long-term underappreciated ones, targeting the early stage Aβ aggregates.
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Affiliation(s)
- Jinfei Mei
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
| | - Huijuan Yang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
| | - Bo Sun
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
| | - Chengqiang Liu
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
| | - Hongqi Ai
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
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Stanković IM, Niu S, Hall MB, Zarić SD. Role of aromatic amino acids in amyloid self-assembly. Int J Biol Macromol 2020; 156:949-959. [PMID: 32199918 DOI: 10.1016/j.ijbiomac.2020.03.064] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 03/09/2020] [Accepted: 03/09/2020] [Indexed: 10/24/2022]
Abstract
Amyloids are proteins of a cross-β structure found as deposits in several diseases and also in normal tissues (nails, spider net, silk). Aromatic amino acids are frequently found in amyloid deposits. Although they are not indispensable, aromatic amino acids, phenylalanine, tyrosine and tryptophan, enhance significantly the kinetics of formation and thermodynamic stability, while tape or ribbon-like morphology is represented in systems with experimentally detected π-π interactions between aromatic rings. Analysis of geometries and energies of the amyloid PDB structures indicate the prevalence of aromatic-nonaromatic interactions and confirm that aromatic-aromatic interactions are not crucial for the amyloid formation.
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Affiliation(s)
| | - Shuqiang Niu
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States of America
| | - Michael B Hall
- Department of Chemistry, Texas A&M University, College Station, TX 77843, United States of America
| | - Snežana D Zarić
- Faculty of Chemistry, University of Belgrade, Studentski Trg, 12-16, Belgrade, Serbia; Department of Chemistry, Texas A&M University at Qatar, P. O. Box 23874, Doha, Qatar.
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Xing X, Liu C, Ali A, Kang B, Li P, Ai H. Novel Disassembly Mechanisms of Sigmoid Aβ 42 Protofibrils by Introduced Neutral and Charged Drug Molecules. ACS Chem Neurosci 2020; 11:45-56. [PMID: 31697060 DOI: 10.1021/acschemneuro.9b00550] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Alzheimer's disease (AD) is characterized by fibrillar deposits of amyloid-β (Aβ) peptides and neurofibrillary tangles of Tau proteins. Aβ peptides are composed of 37-49 residues, among which the Aβ42 isoform is particularly toxic and aggregation-prone and is enriched in the plaques of AD brains and thus considered central to the development of AD. Therefore, disaggregation and disruption provide potential therapeutic approaches to reduce, inhibit, and even reverse Aβ aggregation. Here we capture the atomic-level details of the interactions between sigmoid Aβ42 fibril 2MXU or 5KK3 and either natural tanshinone compounds TS1 or TS0 or negatively charged ER, proposing two unprecedented disassembly mechanisms. Natural TS1 or TS0 prefers to insert into the cavity together with part at the surface of the 2MXU to open up the mouth and twist the conformation, destroying the ordered growth of subsequent monomers along the fibril axis. For the more compact two-fold 5KK3 , attachment of TS1 or TS0 at the surface including some inserted in cavity results in the separation of the two folds. In the two sigmoid fibril systems, it is no longer applicable for the routine criteria to assess Aβ42 fibril disassembly by introduction of these drugs, such as either reduced H-bond number, decreased β-sheet contents, or both. ER, like-charged to Aβ42 fibril, is especially exceptional, and departs utterly from the neutral ones to disassemble Aβ42 fibril. Besides the inapplicable routine criteria, positive binding energy between ER and Aβ42 fibril also deviates from the hypotheses of "ligands exhibiting greater affinity for the β-amyloid peptide are effective at altering its aggregation and inhibiting cell toxicity" ( Cairo et al. , Biochemistry 2002 , 41 , 8620 - 8629 ) but results in stronger disassembly effect on the two kinds of sigmoid Aβ42 fibrils than neutral TS0 or TS1. The disassembly power of charged ER molecules derives from its stronger deformation ability to the conformation of Aβ42 fibril than the neutral ones, twisting the one-fold 2MXU into tapered-shape and separating two-fold 5KK3 in two parts further, which is in great agreement with experimental observations ( Irwin et al. Biomacromolecules 2013 , 14 ( 1 ), 264 - 274 ). The unusual disassembly mechanisms fill the gaps and offer an alternative direction in engineering new inhibitors to treat AD.
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Affiliation(s)
- Xiaofeng Xing
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Chengqiang Liu
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Aqsa Ali
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Baotao Kang
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Ping Li
- Key Laboratory of Life-Organic Analysis, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China
| | - Hongqi Ai
- School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
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7
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Breydo L, Redington JM, Uversky VN. Effects of Intrinsic and Extrinsic Factors on Aggregation of Physiologically Important Intrinsically Disordered Proteins. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2016; 329:145-185. [PMID: 28109327 DOI: 10.1016/bs.ircmb.2016.08.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Misfolding and aggregation of proteins and peptides play an important role in a number of diseases as well as in many physiological processes. Many of the proteins that misfold and aggregate in vivo are intrinsically disordered. Protein aggregation is a complex multistep process, and aggregates can significantly differ in morphology, structure, stability, cytotoxicity, and self-propagation ability. The aggregation process is influenced by both intrinsic (e.g., mutations and expression levels) and extrinsic (e.g., polypeptide chain truncation, macromolecular crowding, posttranslational modifications, as well as interaction with metal ions, other small molecules, lipid membranes, and chaperons) factors. This review examines the effect of a variety of these factors on aggregation of physiologically important intrinsically disordered proteins.
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Affiliation(s)
- L Breydo
- Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, FL, United States.
| | - J M Redington
- Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
| | - V N Uversky
- Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, FL, United States; Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia.
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8
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Investigation of the effect of erythrosine B on amyloid beta peptide using molecular modeling. J Mol Model 2016; 22:92. [DOI: 10.1007/s00894-016-2960-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 03/07/2016] [Indexed: 12/11/2022]
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9
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Aoraha E, Candreva J, Kim JR. Engineering of a peptide probe for β-amyloid aggregates. MOLECULAR BIOSYSTEMS 2015; 11:2281-9. [DOI: 10.1039/c5mb00280j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A non-self-aggregating peptide ligand for β-amyloid aggregates created by simple point mutation of an β-amyloid-derived segment.
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Affiliation(s)
- Edwin Aoraha
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering
- New York University
- Brooklyn
- USA
| | - Jason Candreva
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering
- New York University
- Brooklyn
- USA
| | - Jin Ryoun Kim
- Othmer-Jacobs Department of Chemical and Biomolecular Engineering
- New York University
- Brooklyn
- USA
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