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Iqbal A, Alam MT, Khan A, Siddiqui T, Ali A. Inhibition of protein misfolding and aggregation by steroidal quinoxalin-2(1H)-one and their molecular docking studies. Int J Biol Macromol 2024; 269:132020. [PMID: 38704061 DOI: 10.1016/j.ijbiomac.2024.132020] [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: 11/28/2023] [Revised: 04/27/2024] [Accepted: 04/29/2024] [Indexed: 05/06/2024]
Abstract
A series of D-ring fused 16-substituted steroidal quinoxalin-2(1H)-one attached to an electron-releasing (ER) or electron-withdrawing (EW) groups via steroidal oxoacetate intermediate were synthesized to investigate their protein aggregation inhibition potential using human lysozyme (HLZ). The influence of the type of substituent at the C-6 positions of the quinoxalin-2(1H)-one ring on the protein aggregation inhibition potential was observed, showing that the EW moiety improved the protein aggregation inhibition potency. Of all the evaluated compounds, NO2-substituted quinoxalin-2(1H)-one derivative 13 was the most active compound and had a maximum protein aggregation inhibition effect. Significant stabilization effects strongly support the binding of the most biologically active steroidal quinoxalin-2(1H)-one with docking studies. The predicted physicochemical and ADME properties lie within a drug-like space which shows no violation of Lipinski's rule of five except compounds 12 and 13. Combined, our results suggest that D-ring fused 16-substituted steroidal quinoxalin-2(1H)-one has the potential to modulate the protein aggregation inhibition effect.
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Affiliation(s)
- Arfeen Iqbal
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, UP, India
| | - Md Tauqir Alam
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202 002, UP, India
| | - Asna Khan
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, UP, India
| | - Tabassum Siddiqui
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, UP, India
| | - Abad Ali
- Department of Chemistry, Aligarh Muslim University, Aligarh 202 002, UP, India.
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2
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Singh R, Kundu P, Bhattacharje G, Das AK. Mycobacterium tuberculosis low molecular weight T-cell antigen Mtb8.4 has heme-binding and fiber-forming properties. FEBS Lett 2022; 596:2678-2695. [PMID: 35795993 DOI: 10.1002/1873-3468.14446] [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: 05/27/2022] [Revised: 06/26/2022] [Accepted: 06/27/2022] [Indexed: 11/10/2022]
Abstract
Mtb8.4, a secretory T-cell antigen of Mycobacterium tuberculosis, is important for providing an antigen-specific immune response. In this study, we showed Mtb8.4 to have both heme-binding and fibril-forming properties, using experimental and in silico methods. High absorbance at 410 nm and interaction with hemin-agarose demonstrated its heme-binding nature. Titration of Mtb8.4 with heme resulted in 1:1 stoichiometry. The heme-binding pocket in Mtb8.4 was identified by molecular modeling, and binding residues were predicted using molecular docking. The molecular dynamics simulations of apo- and heme-bound Mtb8.4 confirmed that the heme group forms a stable complex. Transmission electron microscopy analyses and dye-binding assays showed that Mtb8.4 forms fibers. Computational studies predicted that the C-terminal sequence (93 AAQYIGLVESV103 ) is important for forming fibers. In silico analyses further anticipated the probable epitope (82 AMAAQLQAV90 ) of Mtb8.4. The fiber-forming properties of Mtb8.4 could be advantageous from a vaccine perspective for aggregate/fibril-based vaccine delivery or it might influence the epitope presentation of Mtb8.4.
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Affiliation(s)
- Rashika Singh
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Prasun Kundu
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Gourab Bhattacharje
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
| | - Amit Kumar Das
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
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Abstract
Nanomaterials are promising in the development of innovative therapeutic options that include tissue and organ replacement, as well as bone repair and regeneration. The expansion of new nanoscaled biomaterials is based on progress in the field of nanotechnologies, material sciences, and biomedicine. In recent decades, nanomaterial systems have bridged the line between the synthetic and natural worlds, leading to the emergence of a new science called nanomaterial design for biological applications. Nanomaterials replicating bone properties and providing unique functions help in bone tissue engineering. This review article is focused on nanomaterials utilized in or being explored for the purpose of bone repair and regeneration. After a brief overview of bone biology, including a description of bone cells, matrix, and development, nanostructured materials and different types of nanoparticles are discussed in detail.
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Pathak BK, Dey S, Mozumder S, Sengupta J. The role of membranes in function and dysfunction of intrinsically disordered amyloidogenic proteins. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2021; 128:397-434. [PMID: 35034725 DOI: 10.1016/bs.apcsb.2021.08.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Membrane-protein interactions play a major role in human physiology as well as in diseases pathology. Interaction of a protein with the membrane was previously thought to be dependent on well-defined three-dimensional structure of the protein. In recent decades, however, it has become evident that a large fraction of the proteome, particularly in eukaryotes, stays disordered in solution and these proteins are termed as intrinsically disordered proteins (IDPs). Also, a vast majority of human proteomes have been reported to contain substantially long disordered regions, called intrinsically disordered regions (IDRs), in addition to the structurally ordered regions. IDPs exist in an ensemble of conformations and the conformational flexibility enables IDPs to achieve functional diversity. IDPs (and IDRs) are found to be important players in cell signaling, where biological membranes act as anchors for signaling cascades. Therefore, IDPs modulate the membrane architectures, at the same time membrane composition also affects the binding of IDPs. Because of intrinsic disorders, misfolding of IDPs often leads to formation of oligomers, protofibrils and mature fibrils through progressive self-association. Accumulation of amyloid-like aggregates of some of the IDPs is a known causative agent for numerous diseases. In this chapter we highlight recent advances in understanding membrane interactions of some of the intrinsically disordered proteins involved in the pathogenesis of human diseases.
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Affiliation(s)
- Bani Kumar Pathak
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India
| | - Sandip Dey
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India
| | - Sukanya Mozumder
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Jayati Sengupta
- Structural Biology and Bioinformatics Division, CSIR-Indian Institute of Chemical Biology, Jadavpur, Kolkata, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.
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Varshney H, Siddique YH. Role of natural plant products against Alzheimer's disease. CNS & NEUROLOGICAL DISORDERS-DRUG TARGETS 2021; 20:904-941. [PMID: 33881973 DOI: 10.2174/1871527320666210420135437] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 12/12/2020] [Accepted: 02/09/2021] [Indexed: 01/25/2023]
Abstract
Alzheimer's disease (AD) is one of the major neurodegenerative disorder. Deposition of amyloid fibrils and tau protein are associated with various pathological symptoms. Currently limited medication is available for AD treatment. Most of the drugs are basically cholinesterase inhibitors and associated with various side effects. Natural plant products have shown potential as a therapeutic agent for the treatment of AD symptoms. Variety of secondary metabolites like flavonoids, tannins, terpenoids, alkaloids and phenols are used to reduce the progression of the disease. Plant products have less or no side effect and are easily available. The present review gives a detailed account of the potential of natural plant products against the AD symptoms.
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Affiliation(s)
- Himanshi Varshney
- Drosophila Transgenic Laboratory, Section of Genetics, Department of Zoology, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, Uttar Pradesh, India
| | - Yasir Hasan Siddique
- Drosophila Transgenic Laboratory, Section of Genetics, Department of Zoology, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, 202002, Uttar Pradesh, India
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Khalifa I, Sobhy R, Nawaz A, Xiaoou W, Li Z, Zou X. Cyanidin 3-rutinoside defibrillated bovine serum albumin under the glycation-promoting conditions: A study with multispectral, microstructural, and computational analysis. Int J Biol Macromol 2020; 162:1195-1203. [DOI: 10.1016/j.ijbiomac.2020.06.243] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 06/16/2020] [Accepted: 06/25/2020] [Indexed: 12/20/2022]
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Khan MS, Tabrez S, Al-Okail MS, Shaik GM, Bhat SA, Rehman TM, Husain FM, AlAjmi MF. Non-enzymatic glycation of protein induces cancer cell proliferation and its inhibition by quercetin: Spectroscopic, cytotoxicity and molecular docking studies. J Biomol Struct Dyn 2020; 39:777-786. [PMID: 31960772 DOI: 10.1080/07391102.2020.1715838] [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: 02/07/2023]
Abstract
Methylglyoxal (MG) is a potent glycating agent which reacts with proteins to form advanced glycation end products (AGEs). These chemically stable AGEs crosslink with proteins and could lead to amyloid formation that has the role in several diseases including Alzheimer's and Parkinson's. In this piece of work, glycation-induced conformational changes in HSA were observed with quenching of tryptophan fluorescence by 73.8% (41 nm red shift) and loss of hydrophobicity of HSA. CD spectroscopy result reaffirmed secondary structure changes in HSA. Moreover, MG-induced changes in HSA, proceeds to amyloid structure as characterized by an increase in thioflavin (ThT) fluorescence and transmission electron microscopy (TEM) images of HSA aggregates. Quercetin was found to inhibit both AGEs production and amyloid formation. Viability of MCF-7 cells was found to be increased with AGEs treatment, illustrating proliferation of cancer cells. Wound healing assay also revealed increased proliferation and migration of cells in the presence of AGEs. Additionally, molecular docking analyses were performed to demonstrate interactions involved in the stabilization of HSA-quercetin complex. The binding affinities of quercetin were found to be (K d = 105 M -1) much higher compared with MG (K d = 102 M -1). From this study, it is quite clear that quercetin reverses the effect of MG by sterically inhibiting the interaction between HSA and MG. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Mohd Shahnawaz Khan
- Protein Research Chair, Department of Biochemistry, College of Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Shams Tabrez
- King Fahd Medical Research Center, King Abdulaziz University, Jeddah, Saudi Arabia.,Department of Medical Laboratory Technology, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Majed S Al-Okail
- Protein Research Chair, Department of Biochemistry, College of Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Gouse M Shaik
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Sheraz Ahmad Bhat
- Department of Biochemistry, SP College of Sciences, Cluster University of Srinagar, Jammu And Kashmir, India
| | - Tabish M Rehman
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Fohad Mabood Husain
- Department of Agriculture, Collage of Agriculture, Riyadh, King Saud University, Saudi Arabia
| | - Mohamed F AlAjmi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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Bhat WF, Ahmed A, Abbass S, Afsar M, Bano B, Masood A. Deciphering the Nature of Caffeic Acid to Inhibit the HSA Aggregation Induced by Glyoxal. Protein Pept Lett 2020; 27:725-735. [PMID: 32003651 DOI: 10.2174/0929866527666200129105141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Revised: 11/11/2019] [Accepted: 11/13/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Under certain circumstances, the path for protein folding deviates and attains an alternative path forming misfolded states, which are the key precursors for protein aggregation. Protein aggregation is associated with variety of diseases and leads to the cytotoxicity. These protein aggregate related diseases have been untreated so far. However, extensive attempts have been applied to develop anti-aggregating agents as possible approaches to overcome protein aggregation. Different types of substances have been reported to halt or decrease the formation of ordered protein aggregates both in vitro and in vivo, such as polyphenols and metal ions. OBJECTIVE In the present study the in vitro aggregation of human serum albumin (HSA) by using a reactive dicarbonyl glyoxal has been investigated, simultaneously an attempt has been done to inhibit the glyoxal (GO) induced aggregation of (HSA) by caffeic acid (CA). METHODS Different methods have been employed to investigate the process, fluorescence spectroscopy, circular dichroism, cango red binding assay, thioflavin T dye binding, turbidimetric analysis, docking study and transmission electron microscopy. RESULTS Results have shown that elevated concentration of GO forms aggregates of HSA, and the activity of CA suggested the possibility of inhibiting the HSA aggregation at higher concentrations, and this compound was found to have an anti-aggregation property. CONCLUSION The present study explained that micro molar concentrations of CA inhibits the aggregation of HSA and showed pronounced anti-aggregation effect at increasing concentrations in the presence of GO which is elevated in diabetic and hyperglycaemia conditions.
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Affiliation(s)
- Waseem Feeroze Bhat
- Department of Biochemistry, University of Kashmir, Hazratbal Srinagar - 190006, India
| | - Azaj Ahmed
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, UP 202002, India
| | - Shabeena Abbass
- Department of Biochemistry, University of Kashmir, Hazratbal Srinagar - 190006, India
| | - Mohammad Afsar
- CSIR, Central Drug Research Institute, Lucknow 226031, India
| | - Bilqees Bano
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh, UP 202002, India
| | - Akbar Masood
- Department of Biochemistry, University of Kashmir, Hazratbal Srinagar - 190006, India
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Kasi PB, Kotormán M. Among Commercially Available Fruit Juices, Pomegranate Is the Most Effective Inhibitor of PMS-Trypsin Amyloid-Like Fibrils Formation. Nat Prod Commun 2019. [DOI: 10.1177/1934578x19859127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The formation of amyloid fibrils is associated with many human illnesses, such as Alzheimer’s, Huntington’s, and Parkinson’s diseases, amyotrophic lateral sclerosis, spongiform encephalitis, type 2 diabetes, and primary and secondary systemic amyloidosis. Nutrition contributes to the prevention of these diseases. The aim of our work was to look for commercially available fruit juices that can inhibit the formation of amyloid fibrils. Of the fruit juices that we examined, that of pomegranate was found to be the most effective inhibitory agent using turbidity measurements and Congo red binding assay. According to our experiments, pomegranate juice reduced the amount of PMS-trypsin amyloid-like fibrils to 3.7% at 5-fold dilution compared with the sample without pomegranate. The inhibitory effect of the pomegranate juice was concentration dependent.
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Affiliation(s)
- Phanindra Babu Kasi
- Department of Biochemistry and Molecular Biology, Faculty of Science and Informatics, University of Szeged, Hungary
- Doctoral School in Biology, Faculty of Science and Informatics, University of Szeged, Hungary
| | - Márta Kotormán
- Department of Biochemistry and Molecular Biology, Faculty of Science and Informatics, University of Szeged, Hungary
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Mancini RS, Wang Y, Weaver DF. Phenylindanes in Brewed Coffee Inhibit Amyloid-Beta and Tau Aggregation. Front Neurosci 2018; 12:735. [PMID: 30369868 PMCID: PMC6194148 DOI: 10.3389/fnins.2018.00735] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 09/24/2018] [Indexed: 12/12/2022] Open
Abstract
Coffee consumption has been correlated with a decreased risk of developing Alzheimer's disease (AD) and Parkinson's disease (PD), but the mechanism by which coffee may provide neuroprotection in humans is not fully understood. We hypothesized that compounds found in brewed coffee may elicit neuroprotective effects by inhibiting the aggregation of amyloid-beta (Aβ) and tau (AD) or α-synuclein (PD). Three instant coffee extracts (light roast, dark roast, decaffeinated dark roast) and six coffee components [caffeine (1), chlorogenic acid (2), quinic acid (3), caffeic acid (4), quercetin (5), and phenylindane (6)] were investigated for their ability to inhibit the fibrillization of Aβ and tau proteins using thioflavin T (ThT) and thioflavin S (ThS) fluorescence assays, respectively. Inhibition of Aβ and α-synuclein oligomerization was assessed using ELISA assays. All instant coffee extracts inhibit fibrillization of Aβ and tau, and promote α-synuclein oligomerization at concentrations above 100 μg/mL. Dark roast coffee extracts are more potent inhibitors of Aβ oligomerization (IC50 ca. 10 μg/mL) than light roast coffee extract (IC50 = 40.3 μg/mL), and pure caffeine (1) has no effect on Aβ, tau or α-synuclein aggregation. Coffee components 2, 4, and 5 inhibit the fibrillization of Aβ at 100 μM concentration, yet only 5 inhibits Aβ oligomerization (IC50 = 10.3 μM). 1-5 have no effect on tau fibrillization. Coffee component 6, however, is a potent inhibitor of both Aβ and tau fibrillization, and also inhibits Aβ oligomerization (IC50 = 42.1 μM). Coffee components 4 and 5 promote the aggregation of α-synuclein at concentrations above 100 μM; no other coffee components affect α-synuclein oligomerization. While the neuroprotective effect of coffee consumption is likely due to a combination of factors, our data suggest that inhibition Aβ and tau aggregation by phenylindane 6 (formed during the roasting of coffee beans, higher quantities found in dark roast coffees) is a plausible mechanism by which coffee may provide neuroprotection. The identification of 6 as a dual-inhibitor of both Aβ and tau aggregation is noteworthy, and to our knowledge this is the first report of the aggregation inhibition activity of 6.
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Affiliation(s)
- Ross S. Mancini
- Department of Fundamental Neurobiology, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Yanfei Wang
- Department of Fundamental Neurobiology, Krembil Research Institute, University Health Network, Toronto, ON, Canada
| | - Donald F. Weaver
- Department of Fundamental Neurobiology, Krembil Research Institute, University Health Network, Toronto, ON, Canada
- Department of Chemistry, University of Toronto, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto, ON, Canada
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Dhouafli Z, Cuanalo-Contreras K, Hayouni EA, Mays CE, Soto C, Moreno-Gonzalez I. Inhibition of protein misfolding and aggregation by natural phenolic compounds. Cell Mol Life Sci 2018; 75:3521-3538. [PMID: 30030591 PMCID: PMC11105286 DOI: 10.1007/s00018-018-2872-2] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 06/12/2018] [Accepted: 07/09/2018] [Indexed: 12/17/2022]
Abstract
Protein misfolding and aggregation into fibrillar deposits is a common feature of a large group of degenerative diseases affecting the central nervous system or peripheral organs, termed protein misfolding disorders (PMDs). Despite their established toxic nature, clinical trials aiming to reduce misfolded aggregates have been unsuccessful in treating or curing PMDs. An interesting possibility for disease intervention is the regular intake of natural food or herbal extracts, which contain active molecules that inhibit aggregation or induce the disassembly of misfolded aggregates. Among natural compounds, phenolic molecules are of particular interest, since most have dual activity as amyloid aggregation inhibitors and antioxidants. In this article, we review many phenolic natural compounds which have been reported in diverse model systems to have the potential to delay or prevent the development of various PMDs, including Alzheimer's and Parkinson's diseases, prion diseases, amyotrophic lateral sclerosis, systemic amyloidosis, and type 2 diabetes. The lower toxicity of natural compounds compared to synthetic chemical molecules suggest that they could serve as a good starting point to discover protein misfolding inhibitors that might be useful for the treatment of various incurable diseases.
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Affiliation(s)
- Zohra Dhouafli
- Université de Tunis El Manar, Faculté des Sciences de Tunis, 2092, Tunis, Tunisia
- Laboratory of Aromatic and Medicinal Plants, Center of Biotechnology of Borj-Cédria, BP 901, 2050, Hammam-Lif, Tunisia
| | - Karina Cuanalo-Contreras
- The Mitchell Center for Alzheimer's Disease and Related Brain Disorders, Department of Neurology, McGovern Medical School, University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA
| | - El Akrem Hayouni
- Laboratory of Aromatic and Medicinal Plants, Center of Biotechnology of Borj-Cédria, BP 901, 2050, Hammam-Lif, Tunisia
| | - Charles E Mays
- The Mitchell Center for Alzheimer's Disease and Related Brain Disorders, Department of Neurology, McGovern Medical School, University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA
| | - Claudio Soto
- The Mitchell Center for Alzheimer's Disease and Related Brain Disorders, Department of Neurology, McGovern Medical School, University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA
| | - Ines Moreno-Gonzalez
- The Mitchell Center for Alzheimer's Disease and Related Brain Disorders, Department of Neurology, McGovern Medical School, University of Texas Health Science Center at Houston, 6431 Fannin Street, Houston, TX, 77030, USA.
- Department of Cell Biology, Networking Research Center on Neurodegenerative Diseases (CIBERNED), Facultad Ciencias, Universidad de Malaga, Málaga, Spain.
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Sohail A, Bhat WF, Bhat SA, Furkan M, Shah A, Bano B. Investigating the preventive effects of baicalin and gallocatechin against glyoxal-induced cystatin aggregation. J Biomol Struct Dyn 2017; 36:3791-3802. [PMID: 29143574 DOI: 10.1080/07391102.2017.1400470] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Several mammalian proteins form pathological deposits under nonphysiological conditions that are associated with many degenerative diseases. Protein aggregation is associated with aging, as well as a variety of diseases, including cystic fibrosis, amyotrophic lateral sclerosis (ALS), and hypertrophic cardiomyopathy. There is a lack of any potential anti-amyloidogenic agents and therapeutics till date. Polyphenols have been accredited with myriad biological effects. An analysis of the effects of natural agents like baicalin (BC) and gallocatechin (GC) on aggregation process can open new avenues for the treatment of protein misfolding diseases. Thus, investigation of the effects of these flavonoids on Buffalo Heart Cystatin (BHC) aggregation induced by a reactive metabolic dialdehyde, glyoxal (GO), was taken up. Results have shown that elevated concentration of GO forms aggregates of BHC, which was characterized by an increase in the ANS fluorescence intensity, an increase in ThT fluorescence intensity, red shift in Congo red absorbance, negative ellipticity peak at 217 nm in the far-UVCD and BHC aggregates displaying by TEM. Using fluorescence spectroscopic analysis with Thioflavin T, CD and electron microscopic studies, anti-aggregation effects of polyphenols, BC and GC were analyzed. The study showed that BC and GC produced concentration-dependent anti-aggregation effects with GC producing a more pronounced effect than BC. The study proposed a mechanistic approach assuming structural constraints and specific aromatic interactions of polyphenols with sheets of BHC aggregates.
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Affiliation(s)
- Aamir Sohail
- a Department of Biochemistry, Faculty of Life Sciences , Aligarh Muslim University , Aligarh , UP 202002 , India
| | - Waseem Feeroze Bhat
- a Department of Biochemistry, Faculty of Life Sciences , Aligarh Muslim University , Aligarh , UP 202002 , India
| | - Sheraz Ahmad Bhat
- a Department of Biochemistry, Faculty of Life Sciences , Aligarh Muslim University , Aligarh , UP 202002 , India
| | - Mohammad Furkan
- a Department of Biochemistry, Faculty of Life Sciences , Aligarh Muslim University , Aligarh , UP 202002 , India
| | - Aaliya Shah
- b Department of Biochemistry , SKIMS Medical College , Srinagar , Jammu and Kashmir , India
| | - Bilqees Bano
- a Department of Biochemistry, Faculty of Life Sciences , Aligarh Muslim University , Aligarh , UP 202002 , India
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Bhat WF, Bhat SA, Bhat IA, Sohail A, Shah A, Bano B. Anti-fibrillogenic and fibril destabilizing effects of metal ions on cystatin fibrils. Process Biochem 2017. [DOI: 10.1016/j.procbio.2017.03.021] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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In vitro disintegration of goat brain cystatin fibrils using conventional and gemini surfactants: Putative therapeutic intervention in amyloidoses. Int J Biol Macromol 2016; 93:493-500. [DOI: 10.1016/j.ijbiomac.2016.08.082] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 08/26/2016] [Accepted: 08/29/2016] [Indexed: 01/01/2023]
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15
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Bhat SA, Bhat WF, Bano B. Spectroscopic evaluation of the interaction between pesticides and chickpea cystatin: comparative binding and toxicity analyses. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2016; 18:872-81. [PMID: 27327564 DOI: 10.1039/c6em00195e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The binding study of pesticides with proteins is of great importance in ecotoxicology. In this study, a comparative interaction mechanism of phytocystatin with three pesticides has been presented, each from a different class-glyphosate herbicide (GPS), chlorpyrifos insecticide (CPF), and mancozeb fungicide (MCZ). The interaction of purified chickpea cystatin (CPC) has been characterized by fluorescence, UV, and circular dichroism (CD) spectroscopic methods. The study revealed association constants (Ka) of 52 M(-1), 1.145 × 10(3) M(-1), and 36.12 M(-1) for the interaction of CPF, MCZ, and GPS with CPC, respectively, signifying the high affinity interaction for MCZ. Structural changes (at tertiary and secondary levels) were confirmed by UV-visible, intrinsic fluorescence and CD spectroscopy. The results showed that the effect on the CPC structure was more pronounced in the case of MCZ, which was followed by CPF and then GPS. The functional analysis of the pesticide treated inhibitor showed a decline in antipapain activity which varied with the time and dose as well as the class of pesticide. MCZ was relatively much more toxic as compared to CPF and GPS. Reactive oxygen species responsible for inhibitor damage were also analyzed. The results obtained implicate that the exposure of plants to pesticides may lead to physicochemical changes in proteins such as phytocystatins leading to physiological damage to the plant system.
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Affiliation(s)
- Sheraz Ahmad Bhat
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh-202002, India.
| | - Waseem Feeroze Bhat
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh-202002, India.
| | - Bilqees Bano
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh-202002, India.
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