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Shahnawaz Khan M, Ahmad Bhat S, Saud Albagmi M, Arshad M, Tarique M, Bano B. Antiglycation potential of metal ions and polyphenolic extract of chickpea on thiol-protease inhibitor: A management for diabetic complications. Saudi Pharm J 2024; 32:101916. [PMID: 38178850 PMCID: PMC10765112 DOI: 10.1016/j.jsps.2023.101916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 12/11/2023] [Indexed: 01/06/2024] Open
Abstract
Glycation is the non-enzymatic adduct formation between reducing sugars or dicarbonyls with proteins and is a crucial molecular event under hyperglycaemic conditions of diabetes. The accumulation of advanced glycation end products (AGEs) due to glycation of proteins has been implicated in several diseases associated with ageing and diabetes. Thus, investigating the antiglycation potential of some trace metal ions (Manganese; Mn2+, and Zinc; Zn2+) and polyphenolic extract of chickpea seeds (PEC) on the methylglyoxal (MGO) induced glycation of a phytocystatin isolated from chickpea was taken up to find an inexpensive and non-toxic therapeutic means of medicating protein glycation and associated diabetic complications. The current study focused on the comparative analyses of these micronutrients and herbal extracts in inhibiting protein glycation and AGEs formation in a quest to develop nutraceuticals for managing diabetes. The effect of metals (Mn2+, Zn2+) and PEC on protein glycation was assessed by different techniques, i.e., glycation-specific AGE fluorescence and absorbance, thiol protease inhibitory activity assay, and conformational alterations by spectroscopic assays. This study revealed the significant anti-glycation potencies of Mn2+, Zn2+, and PEC against the MGO-induced glycation of CPC, which might pave the way for resolving pathological complications of diabetes by combining higher levels of efficacy, selectivity, and safety in humans. Moreover, characterization and identification of different AGEs formed during the glycation process in diabetics was done to apply the same for determining the onset of glycation at the early stage so that appropriate steps be taken to address the menace of diabetic complications.
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Affiliation(s)
- Mohd Shahnawaz Khan
- Department of Biochemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | | | - Monnera Saud Albagmi
- Department of Biochemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Mohammed Arshad
- Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Mohammad Tarique
- Department of Child Health, School of Medicine, University of Missouri, Columbia, MO 65201, USA
| | - Bilqees Bano
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, INDIA
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2
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Huang Q, Chai WM, Ma ZY, Ou-Yang C, Wei QM, Song S, Zou ZR, Peng YY. Inhibition of α-glucosidase activity and non-enzymatic glycation by tannic acid: Inhibitory activity and molecular mechanism. Int J Biol Macromol 2019; 141:358-368. [DOI: 10.1016/j.ijbiomac.2019.09.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 07/19/2019] [Accepted: 09/03/2019] [Indexed: 01/13/2023]
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3
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Siddiqui S, Siddiqui MF, Khan S, Bano B. Insight into the biochemical characterization of phytocystatin from Glycine max and its interaction with Cd +2 and Ni +2. J Mol Recognit 2019; 32:e2787. [PMID: 31180171 DOI: 10.1002/jmr.2787] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 04/22/2019] [Accepted: 04/30/2019] [Indexed: 12/19/2022]
Abstract
Phytocystatins are cysteine proteinase inhibitors ubiquitously present in plants and animals. They are known to carry out various significant physiological functions and also maintain the balance of protease-antiprotease activity. In the present disquisition, a phytocystatin after preliminary treatment has been isolated and purified to homogeneity from soybean (Glycine max) by a simple two-step stratagem using ammonium sulfate fractionation and gel filtration chromatography performed on Sephacryl S-100-HR. Soybean phytocystatin (SBPC) was purified with a fold purification of 635 and percent yield of 77.6%. A single band was observed on native gel electrophoresis confirming the homogeneity of the purified SBPC. The molecular weight of SBPC was found to be 19.05 kDa as determined by SDS-PAGE. The SBPC was found to be devoid of carbohydrate moieties and sulfhydryl group content. The binding stoichiometry of SBPC-papain interaction was determined by isothermal calorimetry suggesting 1:1 complex, and the value of binding constant (K) was found to be 2.78 × 105 M-1 The affinity of binding (Kd ) value obtained through ITC was 3.59 × 10-6 M. The purified SBPC was found to be stable in the pH range of 3 to 7 and is thermostable up to 50°C. The UV-visible and fluorescence studies showed significant changes in the conformation upon the formation of the SBPC-papain complex. Furthermore, fluorescence spectroscopy, ANS binding, and caseinolytic activity assay were conducted out to explore the effect of metal ions on SBPC which showed that there was a loss in the inhibitory activity along with conformational changes of SBPC upon complex formation with Cd+2 and Ni+2 .
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Affiliation(s)
- Sharmin Siddiqui
- Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Mohd Faizan Siddiqui
- Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Shumaila Khan
- Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Bilqees Bano
- Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
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Abul Qais F, Ahmad I. Mechanism of non-enzymatic antiglycation action by coumarin: a biophysical study. NEW J CHEM 2019. [DOI: 10.1039/c9nj01490j] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Coumarin inhibited non-enzymatic glycation by masking the free amino groups and scavenging carbonyl groups of protein.
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Affiliation(s)
- Faizan Abul Qais
- Department of Agricultural Microbiology
- Aligarh Muslim University
- Aligarh
- India
| | - Iqbal Ahmad
- Department of Agricultural Microbiology
- Aligarh Muslim University
- Aligarh
- India
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Kchaou H, Benbettaïeb N, Jridi M, Abdelhedi O, Karbowiak T, Brachais CH, Léonard ML, Debeaufort F, Nasri M. Enhancement of structural, functional and antioxidant properties of fish gelatin films using Maillard reactions. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2018.05.011] [Citation(s) in RCA: 72] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Bhat SA, Bhat WF, Arif H, Afsar M, Sohail A, Khan MS, Rehman MT, Khan RA, Bano B. Glycation induced conformational transitions in cystatin proceed to form biotoxic aggregates: A multidimensional analysis. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2018; 1866:989-1000. [PMID: 29964207 DOI: 10.1016/j.bbapap.2018.06.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 05/25/2018] [Accepted: 06/27/2018] [Indexed: 11/29/2022]
Abstract
Hyperglycaemic conditions facilitate the glycation of serum proteins which may have predisposition to aggregation and thus lead to complications. The current study investigates the glycation induced structural and functional modifications of chickpea cystatin (CPC) as well as biological toxicity of the modified protein forms, using CPC-glucose as a model system. Several structural intermediates were formed during the incubation of CPC with glucose (day 4, 8, 12, & 16) as revealed by circular dichroism (CD), altered intrinsic fluorescence, and high ANS binding. Further incubation of CPC with glucose (day 21) formed abundant β structures as revealed by Fourier transform infrared spectroscopy and CD analysis which may be due to the aggregation of protein. High thioflavin T fluorescence intensity and increased Congo red absorbance together with enhanced turbidity and Rayleigh scattering by this modified form confirmed the aggregation. Electron microscopy finally provided the valid physical authentication about the presence of aggregate structures. Functional inactivation of glucose incubated CPC was also observed with time. Single cell electrophoresis of lymphocytes and plasmid nicking assays in the presence of modified CPC showed the DNA damage which confirmed its biological toxicity. Hence, our study suggests that glycation of CPC not only leads to structural and functional alterations in proteins but also to biotoxic AGEs and aggregates.
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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
| | - Hussain Arif
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India
| | - Mohammad Afsar
- CSIR, Central Drug Research Institute, Lucknow 226031, India
| | - Aamir Sohail
- 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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Bhat SA, Bhat WF, Afsar M, Khan MS, Al-Bagmi MS, Bano B. Modification of chickpea cystatin by reactive dicarbonyl species: Glycation, oxidation and aggregation. Arch Biochem Biophys 2018; 650:103-115. [DOI: 10.1016/j.abb.2018.05.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 04/17/2018] [Accepted: 05/14/2018] [Indexed: 02/02/2023]
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Li RL, Zhao WW, Gao BY. Advanced glycation end products induce neural tube defects through elevating oxidative stress in mice. Neural Regen Res 2018; 13:1368-1374. [PMID: 30106048 PMCID: PMC6108193 DOI: 10.4103/1673-5374.235249] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Our previous study showed an association between advanced glycation end products (AGEs) and neural tube defects (NTDs). To understand the molecular mechanisms underlying the effect of AGEs on neural tube development, C57BL/6 female mice were fed for 4 weeks with commercial food containing 3% advanced glycation end product bovine serum albumin (AGE-BSA) or 3% bovine serum albumin (BSA) as a control. After mating mice, oxidative stress markers including malondialdehyde and H2O2 were measured at embryonic day 7.5 (E7.5) of gestation, and the level of intracellular reactive oxygen species (ROS) in embryonic cells was determined at E8.5. In addition to evaluating NTDs, an enzyme-linked immunosorbent assay was used to determine the effect of embryonic protein administration on the N-(carboxymethyl) lysine reactivity of acid and carboxyethyl lysine antibodies at E10.5. The results showed a remarkable increase in the incidence of NTDs at E10.5 in embryos of mice fed with AGE-BSA (no hyperglycemia) compared with control mice. Moreover, embryonic protein administration resulted in a noticeable increase in the reactivity of N-(carboxymethyl) lysine and N(ε)-(carboxyethyl) lysine antibodies. Malondialdehyde and H2O2 levels in embryonic cells were increased at E7.5, followed by increased intracellular ROS levels at E8.5. Vitamin E supplementation could partially recover these phenomena. Collectively, these results suggest that AGE-BSA could induce NTDs in the absence of hyperglycemia by an underlying mechanism that is at least partially associated with its capacity to increase embryonic oxidative stress levels.
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Affiliation(s)
- Ru-Lin Li
- Laboratory for Development, College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, China
| | - Wei-Wei Zhao
- Laboratory for Development, College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, China
| | - Bing-Yan Gao
- Laboratory for Development, College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, China
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Glycation induced conformational alterations in caprine brain cystatin (CBC) leads to aggregation via passage through a partially folded state. Int J Biol Macromol 2018; 106:917-929. [DOI: 10.1016/j.ijbiomac.2017.08.086] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Revised: 08/13/2017] [Accepted: 08/14/2017] [Indexed: 11/23/2022]
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Etxabide A, Urdanpilleta M, Gómez-Arriaran I, de la Caba K, Guerrero P. Effect of pH and lactose on cross-linking extension and structure of fish gelatin films. REACT FUNCT POLYM 2017. [DOI: 10.1016/j.reactfunctpolym.2017.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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11
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Wang XP, Zhao XH. Using an enzymatic galactose assay to detect lactose glycation extents of two proteins caseinate and soybean protein isolate via the Maillard reaction. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:2617-2622. [PMID: 27748509 DOI: 10.1002/jsfa.8084] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 09/16/2016] [Accepted: 10/07/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Glycation of food proteins via the Maillard reaction has been widely studied in the recent years; however, the amount of saccharide connected to proteins is usually not determined. An enzymatic galactose assay was proposed firstly in this study to detect lactose glycation extents of caseinate and soybean protein isolate (SPI) during the Maillard reaction at two temperatures and different times. RESULTS The separated glycated proteins were hydrolysed to release galactose necessary for the enzymatic assay and glycation calculation. Caseinate and SPI both obtained the highest lactose glycation extents at 100 °C or 121 °C by a reaction time of 180 or 20 min. Short- and long-time reaction resulted in lower glycation extents. During the reaction, three chemical indices (absorbences at 294/490 nm and fluorescence intensities) of reaction mixtures increased continually, but another index reactable NH2 of glycated proteins showed the opposite trend. In general, changing profiles of the four indices were inconsistent with those profiles of lactose glycation extents of glycated proteins, implying practical limitation of the four indices in studies. CONCLUSION This proposed enzymatic assay could directly detect lactose glycation of the two proteins, and thus was more useful than the four chemical indices to monitor glycation of the two proteins. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Xiao-Peng Wang
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, 150030, P.R. China
| | - Xin-Huai Zhao
- Key Laboratory of Dairy Science, Ministry of Education, Northeast Agricultural University, Harbin, 150030, P.R. China
- Department of Food Science, Northeast Agricultural University, 150030, Harbin, P.R. China
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Siddiqui AA, Khaki PSS, Sohail A, Sarwar T, Bano B. Isolation and purification of phytocystatin from almond: Biochemical, biophysical, and immunological characterization. ACTA ACUST UNITED AC 2016. [DOI: 10.1080/23312025.2016.1262489] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Azad Alam Siddiqui
- Faculty of Life Sciences, Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
| | - Peerzada Shariq Shaheen Khaki
- Faculty of Life Sciences, Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
| | - Aamir Sohail
- Faculty of Life Sciences, Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
| | - Tarique Sarwar
- Department of Biosciences, Jamia Millia Islamia, New Delhi 110025, India
| | - Bilqees Bano
- Faculty of Life Sciences, Department of Biochemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh 202002, India
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González de Vega R, Fernández-Sánchez ML, Fernández JC, Álvarez Menéndez FV, Sanz-Medel A. Selenium levels and Glutathione peroxidase activity in the plasma of patients with type II diabetes mellitus. J Trace Elem Med Biol 2016; 37:44-49. [PMID: 27473831 DOI: 10.1016/j.jtemb.2016.06.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Revised: 05/25/2016] [Accepted: 06/14/2016] [Indexed: 11/28/2022]
Abstract
Selenium, an essential trace element, is involved in the complex system of defense against oxidative stress through selenium-dependent glutathione peroxidases (GPx) and other selenoproteins. Because of its antioxidant properties, selenium or its selenospecies at appropriate levels could hinder oxidative stress and so development of diabetes. In this vein, quantitative speciation of selenium in human plasma samples from healthy and diabetic patients (controlled and non-controlled) was carried out by affinity chromatography (AF) coupled on-line to inductively coupled plasma mass spectrometry (ICP-MS) and isotope dilution analysis (IDA). Similarly, it is well known that patients with diabetes who exhibit poor control of blood glucose show a decreased total antioxidant activity. Thus, we evaluated the enzymatic activity of GPx in diabetic and healthy individuals, using the Paglia and Valentine enzymatic method, observing a significant difference (p<0.05) between the three groups of assayed patients (healthy (n=24): 0.61±0.11U/ml, controlled diabetic (n=38): 0.40±0.12U/ml and non-controlled diabetic patients (n=40): 0.32±0.09U/ml). Our results show that hyperglycemia induces oxidative stress in diabetic patients compared with healthy controls. What is more, glycation of GPx experiments demonstrated that it is the degree of glycation of the selenoenzyme (another species of the Se protein) what actually modulates its eventual activity against ROS in type II diabetes mellitus patients.
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Affiliation(s)
- Raquel González de Vega
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Spain
| | | | - Juan Carlos Fernández
- Management area of clinical laboratory medicine, Hospital Universitario Central de Aturias (HUCA), Oviedo, Spain
| | | | - Alfredo Sanz-Medel
- Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, Spain.
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Iqbal S, Alam MM, Naseem I. Vitamin D prevents glycation of proteins: an in vitro study. FEBS Lett 2016; 590:2725-36. [PMID: 27364912 DOI: 10.1002/1873-3468.12278] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 05/16/2016] [Accepted: 06/23/2016] [Indexed: 12/15/2022]
Abstract
Human serum albumin (HSA) is an important protein involved in the transport of hormones, fatty acids, drugs, and other macromolecules. Under hyperglycemic conditions, this molecule undergoes irreversible modification that affects its structure and function. In this study, we explored the effect of two forms of vitamin D, a nutraceutical, on glycation modification in HSA. The protein was incubated with a physiologically high concentration of glucose in the presence of vitamin D metabolites. After 21 days, samples were tested for secondary structural changes, side chain modification, and the presence of advanced glycation end products. Vitamin D metabolites could reduce glycation modification, albeit only to a small extent. Interaction studies reveal that Vitamin D interaction with HSA can prevent protein glycation.
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Affiliation(s)
- Sarah Iqbal
- Department of Biochemistry, Aligarh Muslim University, India
| | - Md Maroof Alam
- Department of Biochemistry, Aligarh Muslim University, India
| | - Imrana Naseem
- Department of Biochemistry, Aligarh Muslim University, India
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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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Qais FA, Alam MM, Naseem I, Ahmad I. Understanding the mechanism of non-enzymatic glycation inhibition by cinnamic acid: an in vitro interaction and molecular modelling study. RSC Adv 2016. [DOI: 10.1039/c6ra12321j] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Under hyperglycaemic conditions non-enzymatic glycation of proteins gives rise to advanced glycation end products (AGEs).
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Affiliation(s)
- Faizan Abul Qais
- Department of Agricultural Microbiology
- Aligarh Muslim University
- Aligarh
- India
| | - Md. Maroof Alam
- Department of Biochemistry
- Faculty of Life Sciences
- Aligarh Muslim University
- Aligarh
- India
| | - Imrana Naseem
- Department of Biochemistry
- Faculty of Life Sciences
- Aligarh Muslim University
- Aligarh
- India
| | - Iqbal Ahmad
- Department of Agricultural Microbiology
- Aligarh Muslim University
- Aligarh
- India
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17
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Effects of cross-linking in nanostructure and physicochemical properties of fish gelatins for bio-applications. REACT FUNCT POLYM 2015. [DOI: 10.1016/j.reactfunctpolym.2015.07.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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18
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Employing in vitro analysis to test the potency of methylglyoxal in inducing the formation of amyloid-like aggregates of caprine brain cystatin. Amino Acids 2014; 47:135-46. [DOI: 10.1007/s00726-014-1848-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 09/29/2014] [Indexed: 10/24/2022]
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Bhat SA, Bano B. Conformational behaviour and aggregation of chickpea cystatin in trifluoroethanol: effects of epicatechin and tannic acid. Arch Biochem Biophys 2014; 562:51-61. [PMID: 25173679 DOI: 10.1016/j.abb.2014.08.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 08/12/2014] [Accepted: 08/20/2014] [Indexed: 11/29/2022]
Abstract
Conformational alterations and aggregates of chickpea cystatin (CPC) were investigated upon sequential addition of trifluoroethanol (TFE) over a range of 0-70% v/v. CPC on 30% and 40% v/v TFE addition exhibited non-native β-sheet, altered intrinsic fluorescence, increased thioflavin T fluorescence, prominent red shifted shoulder peak in Congo red absorbance, and enhanced turbidity as well as Rayleigh scattering, suggesting the aggregate formation. TEM results confirmed the formation of fibrillar aggregates at 30% and 40% v/v TFE. On increasing concentration of TFE to 70% v/v, CPC showed retention of native-like secondary structure, increased intrinsic and ANS fluorescence. Thus our results show that favourable condition for fibrillation of CPC is in the range of 30-40% TFE. Moreover, anti-aggregational effects of polyphenols, epicatechin (EC) and tannic acid (TA) were analysed using ThT binding assay and other biophysical assays. EC and TA produced a concentration dependent decline in ThT fluorescence suggesting inhibition of the fibril formation. Furthermore, TA in comparison to EC, served as a more effective inhibitor against amyloid fibril formation of CPC. This work supports the universality of the amyloid-like aggregation not restricted to some special categories of protein and the fact that this aggregation can be prevented.
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Affiliation(s)
- Sheraz Ahmad 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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