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Ariaeenejad S, Kavousi K, Zolfaghari B, Roy S, Koshiba T, Hosseini Salekdeh G. Efficient bioconversion of lignocellulosic waste by a novel computationally screened hyperthermostable enzyme from a specialized microbiota. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 252:114587. [PMID: 36758508 DOI: 10.1016/j.ecoenv.2023.114587] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 01/24/2023] [Accepted: 01/28/2023] [Indexed: 06/18/2023]
Abstract
A large amount of lignocellulosic waste is generated every day in the world, and their accumulation in the agroecosystems, integration in soil compositions, or incineration for energy production has severe environmental pollution effects. Using enzymes as biocatalysts for the biodegradation of lignocellulosic materials, especially in harsh processing conditions, is a practical step towards green energy and environmental biosafety. Hence, the current study focuses on enzyme computationally screened from camel rumen metagenomics data as specialized microbiota that have the capacity to degrade lignocellulosic-rich and recalcitrant materials. The novel hyperthermostable xylanase named PersiXyn10 with the performance at extreme conditions was proper activity within a broad temperature (30-100 ℃) and pH range (4.0-11.0) but showed the maximum xylanolytic activity in severe alkaline and temperature conditions, pH 8.0 and temperature 90 ℃. Also, the enzyme had highly resistant to metals, surfactants, and organic solvents in optimal conditions. The introduced xylanase had unique properties in terms of thermal stability by maintaining over 82% of its activity after 15 days of incubation at 90 ℃. Considering the crucial role of hyperthermostable xylanases in the paper industry, the PersiXyn10 was subjected to biodegradation of paper pulp. The proper performance of hyperthermostable PersiXyn10 on the paper pulp was confirmed by structural analysis (SEM and FTIR) and produced 31.64 g/L of reducing sugar after 144 h hydrolysis. These results proved the applicability of the hyperthermostable xylanase in biobleaching and saccharification of lignocellulosic biomass for declining the environmental hazards.
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Affiliation(s)
- Shohreh Ariaeenejad
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran.
| | - Kaveh Kavousi
- Laboratory of Complex Biological Systems and Bioinformatics (CBB), Department of Bioinformatics, Institute of Biochemistry and Biophysics (IBB), University of Tehran, Tehran, Iran
| | - Behrouz Zolfaghari
- CSE Department, Indian Institute of Technology (IIT) Guwahati, Guwahati, Assam, India; Department of Computer Engineering, Faculty of Engineering, Haliç University Eyüpsultan, Istanbul
| | - Swapnoneel Roy
- School of Computing, University of North Florida, Jacksonville, FL, USA
| | - Takeshi Koshiba
- Department of Mathematics, Faculty of Education and Integrated Arts and Sciences, Waseda University, Japan
| | - Ghasem Hosseini Salekdeh
- Department of Systems and Synthetic Biology, Agricultural Biotechnology Research Institute of Iran (ABRII), Agricultural Research Education and Extension Organization (AREEO), Karaj, Iran; Department of Molecular Sciences, Macquarie University, Sydney, 2109 NSW, Australia
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Erfani A, Zarrintaj P, Seaberg J, Ramsey JD, Aichele CP. Zwitterionic poly(carboxybetaine) microgels for enzyme (chymotrypsin) covalent immobilization with extended stability and activity. J Appl Polym Sci 2021. [DOI: 10.1002/app.50545] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Amir Erfani
- School of Chemical Engineering Oklahoma State University Stillwater Oklahoma USA
| | - Payam Zarrintaj
- School of Chemical Engineering Oklahoma State University Stillwater Oklahoma USA
| | - Joshua Seaberg
- School of Chemical Engineering Oklahoma State University Stillwater Oklahoma USA
| | - Joshua D. Ramsey
- School of Chemical Engineering Oklahoma State University Stillwater Oklahoma USA
| | - Clint P. Aichele
- School of Chemical Engineering Oklahoma State University Stillwater Oklahoma USA
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3
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Yang Y, Ji Z, Wu C, Ding YY, Gu Z. Effect of the heating process on the physicochemical characteristics and nutritional properties of whole cotyledon soymilk and tofu. RSC Adv 2020; 10:40625-40636. [PMID: 35519201 PMCID: PMC9057697 DOI: 10.1039/d0ra07911a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Accepted: 10/27/2020] [Indexed: 11/21/2022] Open
Abstract
This study focused on the effect of the heating process on the whole cotyledon soymilk and tofu. Whole cotyledon soymilk was made from soybean cotyledon and processed by enzymatic hydrolysis using cellulase and high-pressure homogeneity. In this study, a one-step heating method was selected for the cooking process of whole cotyledon soybean milk, and the whole cotyledon soybean milk was heated to 90 °C and held for 4 min. Results showed that the protein, total saccharides and dietary fiber content of the whole cotyledon soymilk were higher than those of the tradition soymilk due to the existence of bean dregs (okara). Both protein aggregation and protein-polysaccharide interaction were observed during the heating process. We also found a change in soymilk physicochemical characteristics such as particle size distribution, viscosity, surface hydrophobicity and soluble protein during the heating process. The results in this study showed that compared with traditional tofu, the phytic acid and trypsin inhibitor content in whole cotyledon tofu was lower, so its protein had higher digestibility in vitro. In conclusion, whole cotyledon tofu had better health properties and application prospects.
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Affiliation(s)
- Yuexi Yang
- School of Food Science and Biotechnology, Zhejiang Gongshang University Hangzhou 310018 China +86-571-28008900 +86-571-28877171
| | - Zhoujieyu Ji
- School of Food Science and Biotechnology, Zhejiang Gongshang University Hangzhou 310018 China +86-571-28008900 +86-571-28877171
| | - Cheng Wu
- School of Food Science and Biotechnology, Zhejiang Gongshang University Hangzhou 310018 China +86-571-28008900 +86-571-28877171
| | - Yin-Yi Ding
- School of Food Science and Biotechnology, Zhejiang Gongshang University Hangzhou 310018 China +86-571-28008900 +86-571-28877171
- Food Nutrition Science Centre, Zhejiang Gongshang University Hangzhou 310018 China
| | - Zhenyu Gu
- School of Food Science and Biotechnology, Zhejiang Gongshang University Hangzhou 310018 China +86-571-28008900 +86-571-28877171
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Ariaeenejad S, Hosseini E, Maleki M, Kavousi K, Moosavi-Movahedi AA, Salekdeh GH. Identification and characterization of a novel thermostable xylanase from camel rumen metagenome. Int J Biol Macromol 2019; 126:1295-1302. [DOI: 10.1016/j.ijbiomac.2018.12.041] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 11/19/2018] [Accepted: 12/02/2018] [Indexed: 11/25/2022]
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Ramshini H, Moghaddasi AS, Mollania N, Khodarahmi R. Diverse antithetical effects of the bio-compatible Ag-NPs on the hen egg lysozyme amyloid aggregation: from an efficient inhibitor to obscure inducer. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1478-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Singh MK, Shivakumaraswamy S, Gummadi SN, Manoj N. Role of an N-terminal extension in stability and catalytic activity of a hyperthermostable α/β hydrolase fold esterase. Protein Eng Des Sel 2017; 30:559-570. [PMID: 28967962 DOI: 10.1093/protein/gzx049] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Accepted: 08/25/2017] [Indexed: 12/15/2022] Open
Abstract
The carbohydrate esterase family 7 (CE7) enzymes catalyze the deacetylation of acetyl esters of a broad range of alcohols and is unique in its activity towards cephalosporin C. The CE7 fold contains a conserved N-terminal extension that distinguishes it from the canonical α/β hydrolase fold. The hexameric quaternary structure indicates that the N-terminus may affect activity and specificity by controlling access of substrates to the buried active sites via an entrance tunnel. In this context, we characterized the catalytic parameters, conformation and thermal stability of two truncation variants lacking four and ten residues of the N-terminal region of the hyperthermostable Thermotoga maritima CE7 acetyl esterase (TmAcE). The truncations did not affect the secondary structure or the fold but modulated the oligomerization dynamics. A modest increase was observed in substrate specificity for acetylated xylose compared with acetylated glucose. A drastic reduction of ~30-40°C in the optimum temperature for activity of the variants indicated lower thermal stability. The loss of hyperthermostability appears to be an indirect effect associated with an increase in the conformational flexibility of an otherwise rigid neighboring loop containing a catalytic triad residue. The results suggest that the N-terminal extension was evolutionarily selected to preserve the stability of the enzyme.
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Affiliation(s)
- Mrityunjay K Singh
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Indian Institute of Technology Madras, Chennai 600036, India
| | - Santosh Shivakumaraswamy
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Indian Institute of Technology Madras, Chennai 600036, India
| | - Sathyanarayana N Gummadi
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Indian Institute of Technology Madras, Chennai 600036, India
| | - Narayanan Manoj
- Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences Indian Institute of Technology Madras, Chennai 600036, India
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Lighezan L, Georgieva R, Neagu A. The secondary structure and the thermal unfolding parameters of the S-layer protein from Lactobacillus salivarius. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2016; 45:491-509. [DOI: 10.1007/s00249-016-1117-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 01/26/2016] [Accepted: 02/10/2016] [Indexed: 11/28/2022]
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Verma SK, Ghosh KK, Verma R, Verma S, N. GH, Zhao X. Activity of α-Chymotrypsin in Cationic and Nonionic Micellar Media: Ultraviolet and Fluorescence Spectroscopic Approach. INT J CHEM KINET 2015. [DOI: 10.1002/kin.20972] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Santosh K. Verma
- State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 People's Republic of China
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur India
| | - Kallol K. Ghosh
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur India
| | - Rameshwari Verma
- State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 People's Republic of China
- School of Studies in Chemistry; Pt. Ravishankar Shukla University; Raipur India
| | - Shekhar Verma
- Faculty of Pharmaceutical Sciences; Shri Shankaracharya Group of Institutions; Bhilai India
| | - Girish H. N.
- State Key Laboratory of Advance Technology for Material Synthesis and Processing; Wuhan University of Technology; Wuhan 430070 People's Republic of China
| | - Xiujian Zhao
- State Key Laboratory of Silicate Materials for Architectures; Wuhan University of Technology; Wuhan 430070 People's Republic of China
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9
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DsbA-DsbAmut fusion chaperon improved soluble expression of human trypsinogen-1 in Escherichia coli. Front Chem Sci Eng 2015. [DOI: 10.1007/s11705-015-1519-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
It is well recognized that protein product development is far more challenging than that for small-molecule drugs. The major challenges include inherent sensitivity to different types of stresses during the drug product manufacturing process, high rate of physical and chemical degradation during long-term storage, and enhanced aggregation and/or viscosity at high protein concentrations. In the past decade, many novel formulation concepts and technologies have been or are being developed to address these product development challenges for proteins. These concepts and technologies include use of uncommon/combination of formulation stabilizers, conjugation or fusion with potential stabilizers, site-specific mutagenesis, and preparation of nontraditional types of dosage forms-semiaqueous solutions, nonfreeze-dried solid formulations, suspensions, and other emerging concepts. No one technology appears to be mature, ideal, and/or adequate to address all the challenges. These gaps will likely remain in the foreseeable future and need significant efforts for ultimate resolution.
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Affiliation(s)
- Wei Wang
- BioTherapeutics Pharmaceutical Sciences, Pfizer Inc, 700 Chesterfield Parkway West, Chesterfield, MO, 63017.,Wang Biologics, LLC, 907 Wellesley Place, Chesterfield, Missouri, 63017
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11
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Chang CK, Chen WA, Sie CY, Lin SC, Lin LTW, Lin TH, Hsu CC, Wang SSS. Investigating the effects of plasma pretreatment on the formation of ordered aggregates of lysozyme. Colloids Surf B Biointerfaces 2015; 126:154-61. [DOI: 10.1016/j.colsurfb.2014.12.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 12/05/2014] [Accepted: 12/09/2014] [Indexed: 11/30/2022]
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12
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Tomita S, Tanabe Y, Shiraki K. Oligoethylene glycols prevent thermal aggregation of α-chymotrypsin in a temperature-dependent manner: implications for design guidelines. Biotechnol Prog 2013; 29:1325-30. [PMID: 23804413 DOI: 10.1002/btpr.1762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Revised: 05/07/2013] [Indexed: 12/29/2022]
Abstract
Protein aggregation is problematic in various fields, where aggregation can frequently occur during routine experiments. This study showed that tetraethylene glycol (TEG) and tetraethylene glycol dimethyl ether (TEGDE) act as aggregation suppressors that have different unique properties from typical additives to prevent protein aggregation, such as arginine (Arg) and NaCl. Thermal aggregation of α-chymotrypsin was well suppressed with the addition of both TEG and TEGDE. Interestingly, the suppressive effects of Arg and NaCl on thermal aggregation were almost unchanged when temperature was shifted from 65°C to 85°C, whereas both TEG and TEGDE significantly decreased the aggregation rate with increasing temperature. Note that the effects of TEG and TEGDE were higher than Arg above 75°C. This temperature-dependent behavior of TEG and TEGDE provides a novel design guideline to develop aggregation suppressors for use at high temperature, i.e., the importance of the ethylene oxide group.
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Affiliation(s)
- Shunsuke Tomita
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo, Japan
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14
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Macromolecular crowding modulates the kinetics and morphology of amyloid self-assembly by β-lactoglobulin. Int J Biol Macromol 2013; 53:82-7. [DOI: 10.1016/j.ijbiomac.2012.11.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2012] [Revised: 11/03/2012] [Accepted: 11/05/2012] [Indexed: 11/19/2022]
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15
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Ramshini H, Ebrahim-Habibi A. Thermal disaggregation of type B yeast hexokinase by indole derivatives: a mechanistic study. Int J Biol Macromol 2012; 50:1260-6. [PMID: 22421217 DOI: 10.1016/j.ijbiomac.2012.02.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 02/14/2012] [Accepted: 02/14/2012] [Indexed: 10/28/2022]
Abstract
Protein aggregation is a pathological hallmark of several human disorders, and a central problem in biotechnology, occurring during purification, sterilization, shipping and storage of protein structures. The process is a very complex one, characterized with a remarkable polymorphism of aggregates, including soluble amyloid oligomers, amyloid fibrils and amorphous species. While amyloid structure formation has been extensively investigated during the recent years, amorphous aggregation is still not well characterized. Use of small molecules that affect this process could be informative in this regard. In order to explore the inhibiting effect of small molecules on the amorphous aggregate formation, yeast hexokinase-B, a key enzyme in metabolism, has been chosen for the present study. Thermal aggregation of the enzyme was investigated in 50 mM phosphate buffer, pH 7 at 55°C and the extent of aggregation was measured by monitoring the increase in absorbance at 350 nm versus time. Possible anti-aggregation effects of a variety of non-specific ligands including indole, tryptophan, carbinol, and indomethacin were explored. Turbidity of the protein solutions was found to be diminished by the presence of these small molecules in the above conditions, with the highest effects being exerted by indomethacin. Dynamic light scattering and HPLC confirmed that indomethacin had the highest anti-aggregation effect. These observations, taken together, suggest that the indole ring is likely to play an important role in aggregation inhibition.
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Affiliation(s)
- Hassan Ramshini
- Department of Biology, Payame Noor University, Tehran, Iran.
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Kumar A, Venkatesu P. Overview of the stability of α-chymotrypsin in different solvent media. Chem Rev 2012; 112:4283-307. [PMID: 22506806 DOI: 10.1021/cr2003773] [Citation(s) in RCA: 176] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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Sharma N, Kumar R, Sinha AK, Reddy PB, Nayeem SM, Deep S. Anthraquinone derivatives based natural dye from Rheum emodi as a probe for thermal stability of proteins: Spectroscopic and chromatographic studies. J Pharm Biomed Anal 2012; 62:96-104. [DOI: 10.1016/j.jpba.2011.12.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 12/14/2011] [Accepted: 12/14/2011] [Indexed: 11/16/2022]
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Serno T, Geidobler R, Winter G. Protein stabilization by cyclodextrins in the liquid and dried state. Adv Drug Deliv Rev 2011; 63:1086-106. [PMID: 21907254 DOI: 10.1016/j.addr.2011.08.003] [Citation(s) in RCA: 126] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 08/16/2011] [Accepted: 08/23/2011] [Indexed: 02/07/2023]
Abstract
Aggregation is arguably the biggest challenge for the development of stable formulations and robust manufacturing processes of therapeutic proteins. In search of novel excipients inhibiting protein aggregation, cyclodextrins and their derivatives have been under examination for use in parenteral protein products since more than 20 years and significant research work has been accomplished highlighting the great potential of cyclodextrins as stabilizers of therapeutic proteins. Oftentimes, the potential of cyclodextrins to inhibit protein aggregation has been attributed to their capability to incorporate hydrophobic residues on aggregation-prone proteins or on their partially unfolded intermediates into the hydrophobic cavity. In addition, also other mechanisms besides or even instead of complex formation play a role in the stabilization mechanism, e.g. non-ionic surfactant-like effects. In this review a comprehensive overview of the available research work on the beneficial use of cyclodextrins and their derivatives in protein formulations, liquid as well as dried, is provided. The mechanisms of stabilization against different kinds of stress conditions, such as thermal or surface-induced, are discussed in detail.
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Cyclodextrin, a novel therapeutic tool for suppressing amyloidogenic transthyretin misfolding in transthyretin-related amyloidosis. Biochem J 2011; 437:35-42. [PMID: 21668413 DOI: 10.1042/bj20110041] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
TTR (transthyretin), a β-sheet-rich protein, is the precursor protein of familial amyloidotic polyneuropathy and senile systemic amyloidosis. Although it has been widely accepted that protein misfolding of the monomeric form of TTR is a rate-limiting step for amyloid formation, no effective therapy targeting this misfolding step is available. In the present study, we focused on CyDs (cyclodextrins), cyclic oligosaccharides composed of glucose units, and reported the inhibitory effect of CyDs on TTR amyloid formation. Of various branched β-CyDs, GUG-β-CyD [6-O-α-(4-O-α-D-glucuronyl)-D-glucosyl-β-CyD] showed potent inhibition of TTR amyloid formation. Far-UV CD spectra analysis showed that GUG-β-CyD reduced the conformational change of TTR in the process of amyloid formation. In addition, tryptophan fluorescence and 1H-NMR spectroscopy analyses indicated that GUG-β-CyD stabilized the TTR conformation via interaction with the hydrophobic amino acids of TTR, especially tryptophan. Moreover, GUG-β-CyD exerted its inhibitory effect by reducing TTR deposition in transgenic rats possessing a human variant TTR gene in vivo. Collectively, these results indicate that GUG-β-CyD may inhibit TTR misfolding by stabilizing its conformation, which, in turn, suppresses TTR amyloid formation.
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Verma SK, Ghosh KK. Effect of cationic surfactants on the enzymatic activity of α-chymotrypsin. KINETICS AND CATALYSIS 2011. [DOI: 10.1134/s0023158411010216] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Khodarahmi R, Soori H, Amani M. Study of cosolvent-induced alpha-chymotrypsin fibrillogenesis: does protein surface hydrophobicity trigger early stages of aggregation reaction? Protein J 2010; 28:349-61. [PMID: 19768527 DOI: 10.1007/s10930-009-9200-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The misfolding of specific proteins is often associated with their assembly into fibrillar aggregates, commonly termed amyloid fibrils. Despite the many efforts expended to characterize amyloid formation in vitro, there is no deep knowledge about the environment (in which aggregation occurs) as well as mechanism of this type of protein aggregation. Alpha-chymotrypsin was recently driven toward amyloid aggregation by the addition of intermediate concentrations of trifluoroethanol. In the present study, approaches such as turbidimetric, thermodynamic, intrinsic fluorescence and quenching studies as well as chemical modification have been successfully used to elucidate the underlying role of hydrophobic interactions (involved in early stages of amyloid formation) in alpha-chymotrypsin-based experimental system.
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Affiliation(s)
- Reza Khodarahmi
- Department of Pharmacognosy and Biotechnology, Faculty of Pharmacy, Kermanshah University of Medical Sciences, P. O. Box 67145-1673, Kermanshah, Iran.
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Effect of 2-hydroxypropyl-beta-cyclodextrin on thermal inactivation, denaturation and aggregation of glyceraldehyde-3-phosphate dehydrogenase from rabbit skeletal muscle. Int J Biol Macromol 2010; 46:487-92. [PMID: 20338194 DOI: 10.1016/j.ijbiomac.2010.03.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Revised: 03/12/2010] [Accepted: 03/16/2010] [Indexed: 11/20/2022]
Abstract
The effect of 2-hydroxypropyl-beta-cyclodextrin (HP-beta-CD) on thermal aggregation of glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from rabbit skeletal muscle at 45 degrees C has been studied using dynamic light scattering. In the presence of HP-beta-CD higher values of the rate of aggregation and larger aggregates were registered. The acceleration of GAPDH aggregation was due to destabilization of the enzyme molecule under the action of HP-beta-CD. This is evidenced by the data on thermal inactivation of GAPDH and differential scanning calorimetry.
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Lahari C, Jasti LS, Fadnavis NW, Sontakke K, Ingavle G, Deokar S, Ponrathnam S. Adsorption induced enzyme denaturation: the role of polymer hydrophobicity in adsorption and denaturation of alpha-chymotrypsin on allyl glycidyl ether (AGE)-ethylene glycol dimethacrylate (EGDM) copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1096-1106. [PMID: 19994900 DOI: 10.1021/la904114u] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Effects of changes in hydrophobicity of polymeric support on structure and activity of alpha-chymotrypsin (E.C. 3.4.21.1) have been studied with copolymers of allyl glycidyl ether (AGE) and ethylene glycol dimethacrylate (EGDM) with increasing molar ratio of EGDM to AGE (cross-link density 0.05 to 1.5). The enzyme is readily adsorbed from aqueous buffer at room temperature following Langmuir adsorption isotherms in unexpectedly large amounts (25% w/w). Relative hydrophobicity of the copolymers has been assessed by studying adsorption of naphthalene and Fmoc-methionine by the series of copolymers from aqueous solutions. Polymer hydrophobicity appears to increase linearly on increasing cross-link density from 0.05 to 0.25. Further increase in cross-link density causes a decrease in naphthalene binding but has little effect on binding of Fmoc-Met. Binding of alpha-chymotrypsin to these copolymers follow the trend for Fmoc-methionine binding, rather than naphthalene binding, indicating involvement of polar interactions along with hydrophobic interactions during binding of protein to the polymer. The adsorbed enzyme undergoes extensive denaturation (ca. 80%) with loss of both tertiary and secondary structure on contact with the copolymers as revealed by fluorescence, CD and Raman spectra of the adsorbed protein. Comparison of enzyme adsorption behavior with Eupergit C, macroporous Amberlite XAD-2, and XAD-7 suggests that polar interactions of the EGDM ester functional groups with the protein play a significant role in enzyme denaturation.
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Affiliation(s)
- Challa Lahari
- Biotransformations Laboratory, Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500007, India
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Badraghi J, Yousefi R, Saboury AA, Sharifzadeh A, Haertlé T, Ahmad F, Moosavi-Movahedi AA. Effect of salts and sodium dodecyl sulfate on chaperone activity of camel αS1-CN: Insulin as the target protein. Colloids Surf B Biointerfaces 2009; 71:300-5. [DOI: 10.1016/j.colsurfb.2009.03.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2008] [Revised: 03/11/2009] [Accepted: 03/11/2009] [Indexed: 10/21/2022]
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Rezaei-Ghaleh N, Zweckstetter M, Morshedi D, Ebrahim-Habibi A, Nemat-Gorgani M. Amyloidogenic potential of alpha-chymotrypsin in different conformational states. Biopolymers 2009; 91:28-36. [PMID: 18767127 DOI: 10.1002/bip.21079] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Amyloid fibril formation is widely believed to be a generic property of polypeptide chains. In the present study, alpha-chymotrypsin, a well-known serine protease has been driven toward these structures by the use of two different conditions involving (I) high temperature, pH 2.5, and (II) low concentration of trifluoroethanol (TFE), pH 2.5. A variety of experimental methods, including fluorescence emission, dynamic quenching, steady-state fluorescence anisotropy, far-UV circular dichroism, nuclear magnetic resonance spectroscopy, and dynamic light scattering were employed to characterize the conformational states of alpha-chymotrypsin that precede formation of amyloid fibrils. The structure formed under Condition I was an unfolded monomer, whereas an alpha-helical rich oligomer was induced in Condition II. Both the amyloid aggregation-prone species manifested a higher solvent exposure of hydrophobic and aromatic residues compared with the native state. Upon incubation of the protein in these conditions for 48 h, amyloid-like fibrils were formed with diameters of about 10-12 nm. In contrast, at neutral pH and low concentration of TFE, a significant degree of amorphous aggregation was observed, suggesting that charge neutralization of acidic residues in the amyloid core region has a positive influence on amyloid fibril formation. In summary, results presented in this communication suggest that amyloid fibrils of alpha-chymotrypsin may be obtained from a variety of structurally distinct conformational ensembles highlighting the critical importance of protein evolution mechanisms related to prevention of protein misfolding.
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Affiliation(s)
- Nasrollah Rezaei-Ghaleh
- Department for NMR-based Structural Biology, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
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Ghosh KK, Verma SK. Effects of head group of cationic surfactants on the hydrolysis ofp-nitrophenyl acetate catalyzed by α-chymotrypsin. INT J CHEM KINET 2009. [DOI: 10.1002/kin.20408] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Mousavy SJ, Riazi GH, Kamarei M, Aliakbarian H, Sattarahmady N, Sharifizadeh A, Safarian S, Ahmad F, Moosavi–Movahedi AA. Effects of mobile phone radiofrequency on the structure and function of the normal human hemoglobin. Int J Biol Macromol 2009; 44:278-85. [DOI: 10.1016/j.ijbiomac.2009.01.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Sabbaghian M, Ebrahim-Habibi A, Nemat-Gorgani M. Thermal aggregation of a model allosteric protein in different conformational states. Int J Biol Macromol 2008; 44:156-62. [PMID: 19121335 DOI: 10.1016/j.ijbiomac.2008.11.011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2008] [Revised: 10/27/2008] [Accepted: 11/24/2008] [Indexed: 10/21/2022]
Abstract
Protein aggregation is of crucial importance in a wide variety of situations. High temperatures, combined with other denaturing conditions, have been used very extensively to decipher some of the fundamentals related to formation of amorphous and fibrillar protein aggregates. The present study reports on the dependency of thermal aggregation of bovine liver glutamate dehydrogenase (GDH), a well-characterized allosteric enzyme, on its conformational state. The initial phases of thermal aggregation of this protein was followed in the presence of a number of well-known allosteric ligands. Positive effectors were found to decrease the rate and extent of aggregation in a concentration dependent manner, while negative effectors did the reverse. ADP, one of the most characterized GDH activators was found to stabilize a specific protein conformation resulting in loss of propensity to aggregate. The importance of this observation related to control of protein-protein interactions leading to protein aggregation is discussed.
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Affiliation(s)
- Marjan Sabbaghian
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran 13145-1384, Iran
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Thermally induced changes in the structure and activity of yeast hexokinase B. Biophys Chem 2008; 137:88-94. [PMID: 18715685 DOI: 10.1016/j.bpc.2008.07.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2008] [Revised: 07/14/2008] [Accepted: 07/14/2008] [Indexed: 11/23/2022]
Abstract
Yeast hexokinase has been poorly characterized in regard with its stability. In the present study, various spectroscopic techniques were employed to investigate thermal stability of the monomeric form of yeast hexokinase B (YHB). The enzyme underwent a conformational transition with a T(m) of about 41.9 degrees C. The structural transition proved to be significantly reversible below 55 degrees C and irreversible at higher temperatures. Thermoinactivation studies revealed that enzymatic activity diminished significantly at high temperatures, with greater loss of activity observed above 55 degrees C. Release of ammonia upon deamidation of YHB obeyed a similar temperature-dependence pattern. Dynamic light scattering and size exclusion-HPLC indicated formation of stable aggregates. Taking various findings on the influence of osmolytes and chaperone-like agents on YHB thermal denaturation together, it is proposed that the purely conformational transition of YHB is reversible, and irreversibility is due to aggregation, as a major cause. Deamidation of a critical Asn or Gln residue(s) may also play an important role.
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