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Das N, Yadav S, Negi KS, Tariff E, Sen P. Microsecond Active-Site Dynamics Primarily control Proteolytic Activity of Bromelain: A Single Molecular Level Study with a Denaturant, a Stabilizer and a Macromolecular Crowder. BBA ADVANCES 2022; 2:100041. [PMID: 37082607 PMCID: PMC10074955 DOI: 10.1016/j.bbadva.2022.100041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 12/13/2021] [Accepted: 01/10/2022] [Indexed: 10/19/2022] Open
Abstract
Proteins are dynamic entity with various molecular motions at different timescale and length scale. Molecular motions are crucial for the optimal function of an enzyme. It seems intuitive that these motions are crucial for optimal enzyme activity. However, it is not easy to directly correlate an enzyme's dynamics and activity due to biosystems' enormous complexity. amongst many factors, structure and dynamics are two prime aspects that combinedly control the activity. Therefore, having a direct correlation between protein dynamics and activity is not straightforward. Herein, we observed and correlated the structural, functional, and dynamical responses of an industrially crucial proteolytic enzyme, bromelain with three versatile classes of chemicals: GnHCl (protein denaturant), sucrose (protein stabilizer), and Ficoll-70 (macromolecular crowder). The only free cysteine (Cys-25 at the active-site) of bromelain has been tagged with a cysteine-specific dye to unveil the structural and dynamical changes through various spectroscopic studies both at bulk and at the single molecular level. Proteolytic activity is carried out using casein as the substrate. GnHCl and sucrose shows remarkable structure-dynamics-activity relationships. Interestingly, with Ficoll-70, structure and activity are not correlated. However, microsecond dynamics and activity are beautifully correlated in this case also. Overall, our result demonstrates that bromelain dynamics in the microsecond timescale around the active-site is probably a key factor in controlling its proteolytic activity.
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Das N, Khan T, Subba N, Sen P. Correlating Bromelain's activity with its structure and active-site dynamics and the medium's physical properties in a hydrated deep eutectic solvent. Phys Chem Chem Phys 2021; 23:9337-9346. [PMID: 33885064 DOI: 10.1039/d1cp00046b] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Deep eutectic solvents (DESs) are emerging as new media of choice for biocatalysis due to their environmentally friendly nature, fine-tunability, and potential biocompatibility. This work deciphers the behaviour of bromelain in a ternary DES composed of acetamide, urea, and sorbitol at mole fractions of 0.5, 0.3, and 0.2, respectively (0.5Ac/0.3Ur/0.2Sor), with various degrees of hydration. Bromelain is an essential industrial proteolytic enzyme, and the chosen DES is non-ionic and liquid at room temperature. This provides us with a unique opportunity to contemplate protein behaviour in a non-ionic DES for the very first time. Our results infer that at a low DES concentration (up to 30% V/V DES), bromelain adopts a more compact structural conformation, whereas at higher DES concentrations, it becomes somewhat elongated. The microsecond conformational fluctuation time around the active site of bromelain gradually increases with increasing DES concentration, especially beyond 30% V/V. Interestingly, bromelain retains most of its enzymatic activity in the DES, and at some concentrations, the activity is even higher compared with its native state. Furthermore, we correlate the activity of bromelain with its structure, its active-site dynamics, and the physical properties of the medium. Our results demonstrate that the compact structural conformation and flexibility of the active site of bromelain favour its proteolytic activity. Similarly, a medium with increased polarity and decreased viscosity is favourable for its activity. The presented physical insights into how enzymatic activity depends on the protein structure and dynamics and the physical properties of the medium might provide useful guidelines for the rational design of DESs as biocatalytic media.
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Affiliation(s)
- Nilimesh Das
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur - 208 016, UP, India.
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Jin L, Gao W, Liu C, Zhang N, Mukherjee S, Zhang R, Dong H, Bhunia A, Bednarikova Z, Gazova Z, Liu M, Han J, Siebert HC. Investigating the inhibitory effects of entacapone on amyloid fibril formation of human lysozyme. Int J Biol Macromol 2020; 161:1393-1404. [DOI: 10.1016/j.ijbiomac.2020.07.296] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/01/2020] [Accepted: 07/27/2020] [Indexed: 12/20/2022]
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Wu C, Wang J, Ma W, Cai Y, Wang T. Preheat-stabilized pea proteins with anti-aggregation properties. Int J Biol Macromol 2020; 155:1288-1295. [PMID: 31733245 DOI: 10.1016/j.ijbiomac.2019.11.100] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Revised: 10/14/2019] [Accepted: 11/11/2019] [Indexed: 11/20/2022]
Abstract
Solution stability of food proteins is a crucial factor determining their shelf-life and sensory properties; yet to obtain stable protein products such as beverages is generally challenged by the growing demand for non-additive foods. Here, we report a facile method stabilizing pea proteins (PPs) by a simple preheating process at a concentration below 4% (w/v) and a temperature >90 °C. Far ultraviolet circular dichroism, fluorescence spectra, together with light scattering analyses demonstrated that the PPs were unfolded and became crosslinked via exposed hydrophobic moieties and disulfide bonds, giving rise to the formation a stable spatio-temporal interconnected system that could withstand the initial nucleation of aggregations. In addition, for reheated samples treated at a sufficiently high concentration of 15% (w/v), rheological characterizations revealed decreased aggregation along with increased preheating temperature and decreased preheating concentration. The robust strategy, along with the stabilized PPs in this study, would give a strong insight into preparation of heat-stable proteins with a wide span of concentrations, which may serve the needs for protein-enriched ingredients and satisfy the demands for cost-effective protocols applied in food industry.
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Affiliation(s)
- Chao Wu
- National Engineering Research Center of Seafood, Collaborative Innovation Center of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China
| | - Jiamei Wang
- National Engineering Research Center of Seafood, Collaborative Innovation Center of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China
| | - Wuchao Ma
- National Engineering Research Center of Seafood, Collaborative Innovation Center of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China
| | - Yiru Cai
- National Engineering Research Center of Seafood, Collaborative Innovation Center of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, China
| | - Tao Wang
- State Key Laboratory of Food Science and Technology, National Engineering Laboratory for Cereal Fermentation Technology, Jiangsu Provincial Research Center for Bioactive Product Processing Technology, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.
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Abdullah EM, Haq SH, Ahmed MA, Khan JM, Alamery SF, Malik A. Structural stability and solubility of glycated camel lens ζ-crystallin. Int J Biol Macromol 2020; 158:384-393. [PMID: 32380106 DOI: 10.1016/j.ijbiomac.2020.04.091] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 04/10/2020] [Accepted: 04/11/2020] [Indexed: 02/07/2023]
Abstract
The camel has several biochemical, physiological, and anatomical features to withstand the harsh desert climate. Camel eye lens contains a novel protein (ζ-crystallin) in bulk quantity. Previous reports suggest that non-enzymatic glycation of eye lens proteins plays an important role in the etiology of cataract. In this study, we have characterized the role of glucose, fructose, and methylglyoxal (MGO) in the glycation of camel lens ζ-crystallin. From the results obtained, it was found that MGO reacted rapidly, fructose reacted moderately, and glucose was the least reactive even after prolonged incubation (>100 days). Glycation with MGO and fructose led to changes in the structure of ζ-crystallin, while glucose had no remarkable effect. The surface hydrophobicity did not change and no aggregates or amyloid fibrils were observed in the glycated ζ-crystallin. Moreover, the secondary structure of glycated ζ-crystallin remained similar after glycation. Our results suggested that due to natural adaptation, the camel lens protein ζ-crystallin retained its structure and solubility even after glycation to perform the single known function of the lens proteins: to focus unscattered light on the retina.
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Affiliation(s)
- Ejlal Mohamed Abdullah
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Samina Hyder Haq
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Mohammed Asif Ahmed
- Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia
| | - Javed Masood Khan
- Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, 2460, Riyadh 11451, Saudi Arabia
| | - Salman Freeh Alamery
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ajamaluddin Malik
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia.
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Zakariya SM, Furkan M, Zaman M, Chandel TI, Ali SM, Uversky VN, Khan RH. An in-vitro elucidation of inhibitory potential of carminic acid: Possible therapeutic approach for neurodegenerative diseases. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112692] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Khatun S, Sindhu A, Venkatesu P. Can stem bromelain, a pineapple waste product, be used as a drug alternative? A mechanistic insight into protein–protein interactions. NEW J CHEM 2020. [DOI: 10.1039/d0nj02511a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Binding of stem bromelain to bovine serum albumin induced conformational changes, as shown by various biophysical techniques.
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Affiliation(s)
- Samima Khatun
- Department of Chemistry
- University of Delhi
- Delhi
- India
- Department of Chemistry
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8
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Does macromolecular crowding compatible with enzyme stem bromelain structure and stability? Int J Biol Macromol 2019; 131:527-535. [DOI: 10.1016/j.ijbiomac.2019.03.090] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 03/06/2019] [Accepted: 03/14/2019] [Indexed: 01/21/2023]
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9
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Khan JM, Khan MR, Sen P, Malik A, Irfan M, Khan RH. An intermittent amyloid phase found in gemini (G5 and G6) surfactant induced β-sheet to α-helix transition in concanavalin A protein. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.08.092] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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10
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Khan MV, Zakariya SM, Khan RH. Protein folding, misfolding and aggregation: A tale of constructive to destructive assembly. Int J Biol Macromol 2018; 112:217-229. [DOI: 10.1016/j.ijbiomac.2018.01.099] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 01/04/2018] [Accepted: 01/14/2018] [Indexed: 12/20/2022]
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Ajmal MR, Almutairi F, Zaidi N, Alam P, Siddiqi MK, Khan MV, Zaman M, Ishtikhar M, Khan RH. Biophysical insights into the interaction of clofazimine with human alpha 1-acid glycoprotein: a multitechnique approach. J Biomol Struct Dyn 2018; 37:1390-1401. [DOI: 10.1080/07391102.2018.1461686] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Affiliation(s)
- Mohammad Rehan Ajmal
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
- Department of Biochemistry, Faculty of Sciences, University of Tabuk, Tabuk 71491, Kingdom of Saudi Arabia
| | - Fahad Almutairi
- Department of Biochemistry, Faculty of Sciences, University of Tabuk, Tabuk 71491, Kingdom of Saudi Arabia
| | - Nida Zaidi
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Parvez Alam
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | | | - Mohsin Vahid Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Masihuz Zaman
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Mohd Ishtikhar
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
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Zaman M, Khan MV, Zakariya SM, Nusrat S, Meeran SM, Alam P, Ajmal MR, Wahiduzzaman W, Shahein YE, Abouelella AM, Khan RH. Amino group of salicylic acid exhibits enhanced inhibitory potential against insulin amyloid fibrillation with protective aptitude toward amyloid induced cytotoxicity. J Cell Biochem 2018; 119:3945-3956. [DOI: 10.1002/jcb.26538] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 12/01/2017] [Indexed: 01/30/2023]
Affiliation(s)
- Masihuz Zaman
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
| | - Mohsin Vahid Khan
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
| | - Syed Mohammad Zakariya
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
| | - Saima Nusrat
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
| | - Syed Mustapha Meeran
- Laboratory of Cancer Epigenetics, Division of EndocrinologyCSIR‐Central Drug Research InstituteLucknowIndia
| | - Parvez Alam
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
| | - Mohammad Rehan Ajmal
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
| | | | - Yasser E. Shahein
- Genetic Engineering and Biotechnology Division, Molecular Biology DepartmentNational Research CentreDokkiCairoEgypt
- Biology Department, College of ScienceHail UniversityHailSaudi Arabia
| | - Amira M. Abouelella
- Radiation Biology DepartmentNational Centre for Radiation Research and Technology (NCRRT)CairoEgypt
| | - Rizwan Hasan Khan
- Molecular Biophysics and Biophysical Chemistry GroupInterdisciplinary Biotechnology UnitAligarh Muslim UniversityAligarhIndia
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Nusrat S, Khan RH. Exploration of ligand-induced protein conformational alteration, aggregate formation, and its inhibition: A biophysical insight. Prep Biochem Biotechnol 2018; 48:43-56. [PMID: 29106330 DOI: 10.1080/10826068.2017.1387561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The association of protein aggregates with plentiful human diseases has fascinated studies regarding the biophysical characterization of protein misfolding and ultimately their aggregate formation mechanism. Protein-ligand interaction, their mechanism, conformational changes by ligands, and protein aggregate formation have been studied upon exploiting experimental techniques and computational methodologies. Such studies for the exploration of ligand-induced conformational changes in protein, misfolding and aggregation, has confirmed drastic progresses in the study of aggregate formation pathways. This review comprises of an inclusive description of contemporary experimental techniques as well as theoretical improvements in the interpretation of the conformational properties of protein. We have also discussed various factors responsible for the microenvironment change around protein that sequentially causes amyloidoses. Biophysical techniques and cell-based assays to gain comprehensive understandings of protein-ligand interaction, protein folding, and aggregation pathways have also been described. The promising therapeutic methods used to inhibit the protein fibrillogenesis have also been discussed.
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Affiliation(s)
- Saima Nusrat
- a Interdisciplinary Biotechnology Unit , Aligarh Muslim University , Aligarh , Uttar Pradesh , India
| | - Rizwan Hasan Khan
- a Interdisciplinary Biotechnology Unit , Aligarh Muslim University , Aligarh , Uttar Pradesh , India
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Khan MV, Zaman M, Chandel TI, Siddiqui MK, Ajmal MR, Abdelhameed AS, Khan RH. Cationic surfactant mediated fibrillogenesis in bovine liver catalase: a biophysical approach. J Biomol Struct Dyn 2017; 36:2543-2557. [DOI: 10.1080/07391102.2017.1363085] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Mohsin Vahid Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Masihuz Zaman
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Tajalli Ilm Chandel
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Mohammad Khursheed Siddiqui
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Mohd. Rehan Ajmal
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Ali Saber Abdelhameed
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Rizwan Hasan Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
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Khan MV, Ishtikhar M, Siddiqui MK, Zaman M, Chandel TI, Majid N, Ajmal MR, Abdelhameed AS, Shahein YE, Khan RH. Biophysical insight reveals tannic acid as amyloid inducer and conformation transformer from amorphous to amyloid aggregates in Concanavalin A (ConA). J Biomol Struct Dyn 2017; 36:1261-1273. [DOI: 10.1080/07391102.2017.1318718] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Mohsin Vahid Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Mohd. Ishtikhar
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Mohammad Khursheed Siddiqui
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Masihuz Zaman
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Tajalli Ilm Chandel
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Nabeela Majid
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Mohd. Rehan Ajmal
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
| | - Ali Saber Abdelhameed
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Yasser E. Shahein
- Molecular Biology Department, Genetic Engineering and Biotechnology Division, National Research Centre, Dokki, Cairo, Egypt
| | - Rizwan Hasan Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh 202002, India
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Abdelhameed AS, Nusrat S, Paliwal S, Zaman M, Zaidi N, Khan RH. A multitechnique approach to probe the interaction of a therapeutic tyrosine kinase inhibitor nintedanib and bovine serum albumin. Prep Biochem Biotechnol 2017; 47:655-663. [DOI: 10.1080/10826068.2016.1275014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Ali Saber Abdelhameed
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Saima Nusrat
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Sanjhi Paliwal
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Masihuz Zaman
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Nida Zaidi
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, Uttar Pradesh, India
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Chandel TI, Rabbani G, Khan M, Zaman M, Alam P, E. Shahein Y, Hasan Khan R. Binding of anti-cardiovascular drug to serum albumin: an insight in the light of spectroscopic and computational approaches. J Biomol Struct Dyn 2016; 36:54-67. [DOI: 10.1080/07391102.2016.1266968] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Tajalli Ilm Chandel
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Gulam Rabbani
- School of Medical Biotechnology, YeungNam University, Gyeongsan, Republic of Korea
| | - MohsinVahid Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Masihuz Zaman
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Parvez Alam
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
| | - Yasser E. Shahein
- Molecular Biology Department, Genetic Engineering Division, National Research Centre, Cairo, Egypt
| | - Rizwan Hasan Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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Khan MV, Ishtikhar M, Rabbani G, Zaman M, Abdelhameed AS, Khan RH. Polyols (Glycerol and Ethylene glycol) mediated amorphous aggregate inhibition and secondary structure restoration of metalloproteinase-conalbumin (ovotransferrin). Int J Biol Macromol 2016; 94:290-300. [PMID: 27744055 PMCID: PMC7112414 DOI: 10.1016/j.ijbiomac.2016.10.023] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 10/10/2016] [Indexed: 11/24/2022]
Abstract
Conalbumin aggregates at 65 °C and denaturation occur at above this temperature. The nature of aggregates was identified as amorphous. The polyols inhibits the aggregation of conalbumin via protecting the secondary structure. Glycerol is found to be more protective than ethylene glycol.
Under physical or chemical stress, proteins tend to form aggregates either highly ordered (amyloid) or unordered (amorphous) causing many pathological disorders in human and loss of proteins functionality in both laboratory conditions and industries during production and storage at commercial level. We investigated the effect of increasing temperature on Conalbumin (CA) and induced aggregation at 65 °C. The enhanced Thioflavin T (ThT) and ANS (1-anilinonaphtalene 8-sulfonic acid) fluorescence intensity, show no shift on Congo red binding, additionally, transmission and scanning electron microscopy (TEM) (SEM) reveal amorphous morphology of the aggregate. Our investigation clearly demonstrated that polyols namely Glycerol (GL) and Ethylene glycol (EG) are so staunch to inhibit amorphous aggregates via restoring secondary conformation. Addition of polyols (15% GL and 35% EG) significantly decrease the turbidity, Rayleigh scattering ThT and ANS fluorescence intensity. The dynamic light scattering (DLS) data show that hydrodynamic radii (Rh) of the aggregates is ∼20 times higher than native CA while nearly similar for GL and EG protected CA due to condensation of core size with little difference.
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Affiliation(s)
- Mohsin Vahid Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Mohd Ishtikhar
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Gulam Rabbani
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Masihuz Zaman
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
| | - Ali Saber Abdelhameed
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Rizwan Hasan Khan
- Molecular Biophysics and Biophysical Chemistry Group, Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India.
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