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Ali M, Greenig M, Oeller M, Atkinson M, Xu X, Sormanni P. Automated optimization of the solubility of a hyper-stable α-amylase. Open Biol 2024; 14:240014. [PMID: 38745462 DOI: 10.1098/rsob.240014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 03/27/2024] [Indexed: 05/16/2024] Open
Abstract
Most successes in computational protein engineering to date have focused on enhancing one biophysical trait, while multi-trait optimization remains a challenge. Different biophysical properties are often conflicting, as mutations that improve one tend to worsen the others. In this study, we explored the potential of an automated computational design strategy, called CamSol Combination, to optimize solubility and stability of enzymes without affecting their activity. Specifically, we focus on Bacillus licheniformis α-amylase (BLA), a hyper-stable enzyme that finds diverse application in industry and biotechnology. We validate the computational predictions by producing 10 BLA variants, including the wild-type (WT) and three designed models harbouring between 6 and 8 mutations each. Our results show that all three models have substantially improved relative solubility over the WT, unaffected catalytic rate and retained hyper-stability, supporting the algorithm's capacity to optimize enzymes. High stability and solubility embody enzymes with superior resilience to chemical and physical stresses, enhance manufacturability and allow for high-concentration formulations characterized by extended shelf lives. This ability to readily optimize solubility and stability of enzymes will enable the rapid and reliable generation of highly robust and versatile reagents, poised to contribute to advancements in diverse scientific and industrial domains.
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Affiliation(s)
- Montader Ali
- Yusuf Hamied Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, UK
| | - Matthew Greenig
- Yusuf Hamied Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, UK
| | - Marc Oeller
- Yusuf Hamied Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, UK
- Proteomics and Signal Transduction, Max Planck Institute of Biochemistry , Martinsried 82152, Germany
| | - Misha Atkinson
- Yusuf Hamied Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, UK
| | - Xing Xu
- Yusuf Hamied Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, UK
| | - Pietro Sormanni
- Yusuf Hamied Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, UK
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Khator R, Monga V. Recent advances in the synthesis and medicinal perspective of pyrazole-based α-amylase inhibitors as antidiabetic agents. Future Med Chem 2024. [PMID: 38230638 DOI: 10.4155/fmc-2023-0285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024] Open
Abstract
Diabetes is a serious health threat across the globe, claiming millions of lives worldwide. Among the various strategies employed, inhibition of α-amylase is a therapeutic protocol for the management of Type 2 diabetes mellitus. α-Amylase is a crucial enzyme involved in the breakdown of dietary starch into simpler units. However, the clinically used α-amylase inhibitors have various drawbacks. Therefore, design and development of novel α-amylase inhibitors have gained significant attention. The pyrazole motif has been identified as a versatile scaffold in medicinal chemistry, and recent studies have led to the identification of various pyrazole-based α-amylase inhibitors. This review compiles therapeutic implications of pyrazole-appended α-amylase inhibitors; their synthesis, biological activities, structure-activity relationships and molecular docking studies are discussed.
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Affiliation(s)
- Rakesh Khator
- Drug Design & Molecular Synthesis Laboratory, Department of Pharmaceutical Sciences & Natural Products, Central University of Punjab, VPO-Ghudda, 151401, Bathinda, Punjab, India
| | - Vikramdeep Monga
- Drug Design & Molecular Synthesis Laboratory, Department of Pharmaceutical Sciences & Natural Products, Central University of Punjab, VPO-Ghudda, 151401, Bathinda, Punjab, India
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3
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Nnaji PT, Adukwu E, Morse HR, Chidugu-Ogborigbo RU. Amylase production from marine sponge Hymeniacidon perlevis; potentials sustainability benefits. PLoS One 2023; 18:e0294931. [PMID: 38127953 PMCID: PMC10734944 DOI: 10.1371/journal.pone.0294931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 11/11/2023] [Indexed: 12/23/2023] Open
Abstract
The marine sponge Hymeniacidon perlevis is a globally distributed and invasive species with extensive filter-feeding characteristics. The symbiotic relationship fostered between the sea sponge and the inhabiting microorganism is key in the production of metabolic enzymes which is the focus of this study. Sponge bacterial symbionts were grown on starch agar for 48hrs. Colourimetric analyses of amylase were conducted at 540nm using a spectrophotometric plate reader. Using an X-Bridge column (3.5μM, 4.6x150mm), 80/20 acetonitrile/water in 0.1% ammonium were the conditions used for the liquid chromatography-mass spectrometry (LC-MS) analyses. Seven reducing sugars were used to optimise LC-MS to determine the presence of the crude enzyme formed. Not all the bacterial symbionts isolated from H perlevis produced alpha and beta amylases to break down starch. From the statistical mean of crude enzyme concentrations from the hydrolysis of starch by amylase, isolate seven had the highest optical density (OD) at 0.43475 while isolate twelve had the lowest OD at 0.141417. From the LC-MS analysis, out of the seven sugars, Glucose and maltose constituted > 65% of the reducing sugars formed from the hydrolysis of starch by the amylases. Isolates 3,6 and 7 produced 6.906 mg/l, 12.309 mg/l, and 5.909 mg/l of glucose, while isolates 3,4,5,6 and 7 produced 203.391 mg/l, 176.238 mg/l, 139.938 mg/l, 39.030 mg/l, and 18.809 mg/l of maltose, respectively. Isolate two had the highest amount of maltose at a concentration of 267.237 mg/l while isolate four had the highest amount of glucose concentration of 53.084 mg/l. Enzymes from marine sponge bacteria offer greater potential for a green and sustainable production process. Amylase extraction from bacterial symbionts in H perlevis is sustainable and should be supported. They can serve as reliable sources of revenue for enzyme industries, and applications in food industries and biotechnological processes.
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Affiliation(s)
- Praise Tochukwu Nnaji
- School of Applied Sciences, College of Health, and Applied Sciences, The University of the West of England, Bristol, United Kingdom
| | - Emmanuel Adukwu
- Centre for Biosciences Research, School of Applied Sciences, The University of the West of England, Bristol, United Kingdom
| | - H. Ruth Morse
- Centre for Biosciences Research, School of Applied Sciences, The University of the West of England, Bristol, United Kingdom
| | - Rachael U. Chidugu-Ogborigbo
- School of Applied Sciences, College of Health, and Applied Sciences, The University of the West of England, Bristol, United Kingdom
- Centre for Biosciences Research, School of Applied Sciences, The University of the West of England, Bristol, United Kingdom
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4
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Safdar LB, Dugina K, Saeidan A, Yoshicawa GV, Caporaso N, Gapare B, Umer MJ, Bhosale RA, Searle IR, Foulkes MJ, Boden SA, Fisk ID. Reviving grain quality in wheat through non-destructive phenotyping techniques like hyperspectral imaging. Food Energy Secur 2023; 12:e498. [PMID: 38440412 PMCID: PMC10909436 DOI: 10.1002/fes3.498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 08/10/2023] [Accepted: 08/14/2023] [Indexed: 03/06/2024] Open
Abstract
A long-term goal of breeders and researchers is to develop crop varieties that can resist environmental stressors and produce high yields. However, prioritising yield often compromises improvement of other key traits, including grain quality, which is tedious and time-consuming to measure because of the frequent involvement of destructive phenotyping methods. Recently, non-destructive methods such as hyperspectral imaging (HSI) have gained attention in the food industry for studying wheat grain quality. HSI can quantify variations in individual grains, helping to differentiate high-quality grains from those of low quality. In this review, we discuss the reduction of wheat genetic diversity underlying grain quality traits due to modern breeding, key traits for grain quality, traditional methods for studying grain quality and the application of HSI to study grain quality traits in wheat and its scope in breeding. Our critical review of literature on wheat domestication, grain quality traits and innovative technology introduces approaches that could help improve grain quality in wheat.
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Affiliation(s)
- Luqman B. Safdar
- International Flavour Research Centre, Division of Food, Nutrition and DieteticsUniversity of NottinghamLoughboroughUK
- International Flavour Research Centre (Adelaide), School of Agriculture, Food and Wine and Waite Research InstituteUniversity of AdelaideGlen OsmondSouth AustraliaAustralia
- Division of Plant and Crop Sciences, School of BiosciencesUniversity of NottinghamLoughboroughUK
- Plant Research Centre, School of Agriculture, Food and WineUniversity of AdelaideGlen OsmondSouth AustraliaAustralia
| | - Kateryna Dugina
- International Flavour Research Centre, Division of Food, Nutrition and DieteticsUniversity of NottinghamLoughboroughUK
| | - Ali Saeidan
- International Flavour Research Centre, Division of Food, Nutrition and DieteticsUniversity of NottinghamLoughboroughUK
| | - Guilherme V. Yoshicawa
- Plant Research Centre, School of Agriculture, Food and WineUniversity of AdelaideGlen OsmondSouth AustraliaAustralia
| | | | - Brighton Gapare
- Division of Plant and Crop Sciences, School of BiosciencesUniversity of NottinghamLoughboroughUK
| | - M. Jawad Umer
- Cotton Research InstituteChinese Academy of Agricultural SciencesAnyangChina
| | - Rahul A. Bhosale
- Division of Plant and Crop Sciences, School of BiosciencesUniversity of NottinghamLoughboroughUK
| | - Iain R. Searle
- School of Biological SciencesUniversity of AdelaideAdelaideSouth AustraliaAustralia
| | - M. John Foulkes
- Division of Plant and Crop Sciences, School of BiosciencesUniversity of NottinghamLoughboroughUK
| | - Scott A. Boden
- Plant Research Centre, School of Agriculture, Food and WineUniversity of AdelaideGlen OsmondSouth AustraliaAustralia
| | - Ian D. Fisk
- International Flavour Research Centre, Division of Food, Nutrition and DieteticsUniversity of NottinghamLoughboroughUK
- International Flavour Research Centre (Adelaide), School of Agriculture, Food and Wine and Waite Research InstituteUniversity of AdelaideGlen OsmondSouth AustraliaAustralia
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Devi M, Kumar P, Singh R, Sindhu J, Kumar A, Lal S, Singh D, Kumar H. α-amylase inhibition and in silico studies of novel naphtho[2,3- d]imidazole-4,9-dione linked N-acyl hydrazones. Future Med Chem 2023; 15:1511-1525. [PMID: 37610859 DOI: 10.4155/fmc-2023-0158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2023] Open
Abstract
Aim: To enrich the pool of α-amylase inhibitors to manage Type 2 diabetes. Methods: Synthesis, conformational study, α-amylase inhibitory action and various in silico studies of novel N'-(arylbenzylidene)-2-(4,9-dioxo-4,9-dihydro-1H-naphtho[2,3-d]imidazol-1-yl)acetohydrazides carried out. Results: Compound H6 demonstrated the highest activity (IC50 = 0.0437 μmol mL-1) among the tested compounds. Structure-activity relationship study suggested that variable substitution at the aryl ring has a pivotal role in determining the inhibitory action of tested compounds. Docking simulations of the most active compound (H6) confirmed its interaction potential with active site residues of A. oryzae α-amylase. The root-mean-square deviation fluctuations substantiated the stability of protein-ligand complex. Absorption, distribution, metabolism and excretion prediction revealed optimal values for absorption, distribution, metabolism and excretion parameters. Conclusion: The developed molecules could be beneficial for the development of novel α-amylase inhibitors to treat Type 2 diabetes.
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Affiliation(s)
- Meena Devi
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Parvin Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Rahul Singh
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Jayant Sindhu
- Department of Chemistry, COBS&H, CCS Haryana Agricultural University, Hisar, 125004, India
| | - Ashwani Kumar
- Department of Pharmaceutical Sciences, GJUS&T, Hisar, 125001, India
| | - Sohan Lal
- Department of Chemistry, Kurukshetra University, Kurukshetra, 136119, India
| | - Devender Singh
- Department of Chemistry, Maharshi Dayanand University, Rohtak, 124001, India
| | - Harish Kumar
- Department of Chemistry, School of Basic Sciences, Central University Haryana, Mahendergarh, 123031, India
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6
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Zhu X, Tian Y, He B. Developing an ecofriendly UCST-type enzymatic cascade system for efficient and cost-effective starch solid wastes treatment. ENVIRONMENTAL RESEARCH 2023; 222:115414. [PMID: 36736754 DOI: 10.1016/j.envres.2023.115414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 01/06/2023] [Accepted: 02/01/2023] [Indexed: 06/18/2023]
Abstract
Enzymatic utilization of starch solid wastes is promising but hindered by its high cost. Enzymes immobilization is one solution; however, the key challenge remains the low mass transfer rate between the solid immobilization system and the solid wastes. Herein, an enzymatic modification strategy was applied instead of the traditional immobilization method. A novel system composed of poly(methacrylic acid), polyacrylic acid, and gelatin was firstly prepared and then used to modify α-amylase and glucoamylase to endow them with upper critical solution temperature (UCST) characteristic. As a result, we found that the wastes can be hydrolyzed efficiently with the modified co-enzymes above UCST and can be easily recovered and separated below UCST, thus the cost of starch wastes treatment can be largely reduced. Besides, the proposed method exhibited excellent environmental-friendly and bio-safety properties. Therefore, this method laid a solid foundation for efficient and cost-effective enzymatic conversion of starch solid wastes.
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Affiliation(s)
- Xing Zhu
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, PR China; The Youth Innovation Team of Shaanxi Universities, Xi'an, 710021, Shaanxi, PR China
| | - Yi Tian
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, PR China
| | - Bin He
- College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, Shaanxi, PR China.
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7
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Xu S, Qin L, Mazhar M, Zhu Y. Functional components profile and glycemic index of kidney beans. Front Nutr 2022; 9:1044427. [PMID: 36407530 PMCID: PMC9667044 DOI: 10.3389/fnut.2022.1044427] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 10/18/2022] [Indexed: 08/27/2023] Open
Abstract
Low glycemic index (GI) diet has been considered as a strategy for type II diabetes patients. In the present study, the phenolics profile, α-amylase inhibitor activities, starch composition as well as the glycemic index of seven varieties of kidney beans were studied. An enzymatic inhibitory reaction model was employed to determine the α-amylase inhibitor activity, and the in vitro digestion model coupled with the 3, 5-dinitrosalicylic acid colorimetry method was adopted to evaluate the starch composition and glycemic index. The results showed that gallic acid was dominant in kidney beans, and the colored beans contained more phenolics than the white ones. In addition, the α-amylase inhibitor activities of kidney beans ranged from 1.659 ± 0.050 to 4.162 ± 0.049 U/g DW, among which the Y2 variety was the top-ranked. Furthermore, kidney beans starch demonstrated brilliant resistance to digestion with the contribution of resistant starch to total starch between 70.90 ± 0.39% and 83.12 ± 0.42%. Eventually, these kidney beans were categorized as low GI foods, which ranged from 32.47 ± 0.13 to 52.99 ± 0.56, the resistant starch makes dominant contribution to the low GI. These results indicate that kidney beans can be served as ingredients in functional low GI foods.
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Affiliation(s)
- Shengshu Xu
- School of Liquor and Food Engineering, Guizhou University, Guiyang, China
| | - Likang Qin
- School of Liquor and Food Engineering, Guizhou University, Guiyang, China
| | - Muhammad Mazhar
- College of Life Sciences, Guizhou University, Guiyang, China
| | - Yong Zhu
- School of Liquor and Food Engineering, Guizhou University, Guiyang, China
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8
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Ding N, Zhao B, Han X, Li C, Gu Z, Li Z. Starch-Binding Domain Modulates the Specificity of Maltopentaose Production at Moderate Temperatures. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:9057-9065. [PMID: 35829707 DOI: 10.1021/acs.jafc.2c03031] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Maltooligosaccharide-forming amylases (MFAs) hydrolyze starch into maltooligosaccharides with a defined degree of polymerization. However, the enzymatic mechanism underlying the product specificity remains partially understood. Here, we show that Saccharophagus degradans MFA (SdMFA) contains a noncatalytic starch-binding domain (SBD), which belongs to the carbohydrate-binding module family 20 and enables modulation of the product specificity. Removal of SBD from SdMFA resulted in a 3.5-fold lower production of the target maltopentaose. Conversely, appending SBD to another MFA from Bacillus megaterium improved the specificity for maltopentaose. SdMFA exhibited a higher level of exo-action and greater product specificity when reacting with amylopectin than with amylose. Our structural analysis and molecular dynamics simulation suggested that SBD could promote the recognition of nonreducing ends of substrates and delivery of the substrate chain to a groove end toward the active site in the catalytic domain. Furthermore, we demonstrate that a moderate temperature could mediate SBD to interact with the substrate with loose affinity, which facilitates the substrate to slide toward the active site. Together, our study reveals the structural and conditional bases for the specificity of MFAs, providing generalizable strategies to engineer MFAs and optimize the biosynthesis of maltooligosaccharides.
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Affiliation(s)
- Ning Ding
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Boyang Zhao
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, Texas 77030, United States
| | - Xu Han
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
| | - Caiming Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, China
| | - Zhengbiao Gu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, China
| | - Zhaofeng Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, China
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9
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Peddio S, Padiglia A, Cannea FB, Crnjar R, Zam W, Sharifi-Rad J, Rescigno A, Zucca P. Common bean (Phaseolus vulgaris L.) α-amylase inhibitors as safe nutraceutical strategy against diabetes and obesity: An update review. Phytother Res 2022; 36:2803-2823. [PMID: 35485365 PMCID: PMC9544720 DOI: 10.1002/ptr.7480] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 03/22/2022] [Accepted: 04/14/2022] [Indexed: 12/23/2022]
Abstract
Overweight and obesity are constantly increasing, not only in Western countries but also in low‐middle‐income ones. The decrease of both the intake of carbohydrates and their assimilation are among the main dietary strategies to counter these conditions. α‐Amylase, a key enzyme involved in the digestion of carbohydrates, is the target enzyme to reduce the absorption rate of carbohydrates. α‐Amylase inhibitors (α‐AIs) can be found in plants. The common bean, Phaseolus vulgaris is of particular interest due to the presence of protein‐based α‐AIs which, through a protein–protein interaction, reduce the activity of this enzyme. Here we describe the nature of the various types of common bean seed extracts, the type of protein inhibitors they contain, reviewing the recent Literature about their molecular structure and mechanism of action. We also explore the existing evidence (clinical trials conducted on both animals and humans) supporting the potential benefits of this protein inhibitors from P. vulgaris, also highlighting the urgent need of further studies to confirm the clinical efficacy of the commercial products. This work could contribute to summarize the knowledge and application of P. vulgaris extract as a nutraceutical strategy for controlling unwanted weight gains, also highlighting the current limitations.
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Affiliation(s)
- Stefania Peddio
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Alessandra Padiglia
- Department of Life and Environmental Sciences (DiSVA), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Faustina B Cannea
- Department of Life and Environmental Sciences (DiSVA), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Roberto Crnjar
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Wissam Zam
- Department of Analytical and Food Chemistry, Faculty of Pharmacy, Al-Wadi International University, Tartous, Syria
| | | | - Antonio Rescigno
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
| | - Paolo Zucca
- Department of Biomedical Sciences (DiSB), Cittadella Universitaria di Monserrato, Cagliari, Italy
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10
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Antibiofilm Potential of Alpha-Amylase from a Marine Bacterium, Pantoea agglomerans. CANADIAN JOURNAL OF INFECTIOUS DISEASES AND MEDICAL MICROBIOLOGY 2022; 2022:7480382. [PMID: 35462682 PMCID: PMC9033359 DOI: 10.1155/2022/7480382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 02/24/2022] [Accepted: 03/24/2022] [Indexed: 11/17/2022]
Abstract
Bacterial biofilms are a big menace to industries and the environment and also in the health sector, accumulation of which is a major challenge. Despite intensive efforts to curb this issue, a definitive solution is yet to be achieved. Enzyme-templated disruption of the extracellular matrix of biofilm and its control and elimination are emerging as an efficient and greener strategy. The study describes the antibiofilm potential of alpha-amylase from the marine microorganism Pantoea agglomerans PCI05, against food-borne pathogens. Amylase exhibited stability in a wide pH range and retained 50% of its activity at temperatures as high as 100°C. Thermal analysis of the enzyme produced showed thermal stability, up to 130°C. From these findings, it can be envisaged that the alpha-amylase produced from P. agglomerans can be used for starch liquefaction; it was also evaluated for antibiofilm activity. Amylase from this marine bacterium was found to efficiently disrupt the preformed biofilms of food-borne pathogens such as Bacillus cereus, Serratia marcescens, Vibrio parahaemolyticus, Listeria monocytogenes, and Salmonella enterica enterica serotype Typhi based on the value of biofilm inhibitory concentrations.
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11
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Nidhar M, Sonker P, Sharma VP, Kumar S, Tewari AK. Design, synthesis and in-silico & in vitro enzymatic inhibition assays of pyrazole-chalcone derivatives as dual inhibitors of α-amylase & DPP-4 enzyme. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-021-01985-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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12
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Han X, Ding N, Ban X, Gu Z, Cheng L, Hong Y, Li C, Li Z. Fusion of maltooligosaccharide-forming amylases from two origins for the improvement of maltopentaose synthesis. Food Res Int 2021; 150:110735. [PMID: 34865754 DOI: 10.1016/j.foodres.2021.110735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 09/02/2021] [Accepted: 09/25/2021] [Indexed: 01/10/2023]
Abstract
Maltopentaose-forming amylases are promising enzymes for their ability to hydrolyze starch and produce functional maltooligosaccharides. Two maltopentaose-forming amylase genes from Bacillus megaterium (BmMFA) and Saccharophagus degradans (SdMFA) were expressed heterologously and their characteristics were analyzed. BmMFA has substantial thermostability and SdMFA owns superior product specificity. The carbohydrate-binding module of SdMFA was fused with BmMFA and the fused protein showed ideal enzymatic properties and displayed potential for industrial production of maltopentaose. Under the optimized conditions, the final product containing 47.41% maltopentaose was obtained with a conversion rate of 92.67% from starch. This study provides a novel strategy for the directed modification of MFAses through protein fusion approach.
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Affiliation(s)
- Xu Han
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China
| | - Ning Ding
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China
| | - Xiaofeng Ban
- School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China
| | - Zhengbiao Gu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, PR China
| | - Li Cheng
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, PR China
| | - Yan Hong
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, PR China
| | - Caiming Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, PR China
| | - Zhaofeng Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; School of Food Science and Technology, Jiangnan University, Wuxi 214122, PR China; Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi 214122, PR China.
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13
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Deng Q, Wang W, Zhang Q, Chen J, Zhou H, Meng W, Li J. Extraction optimization of polysaccharides from Gougunao tea and assessment of the antioxidant and hypoglycemic activities of its fractions in vitro. BIOACTIVE CARBOHYDRATES AND DIETARY FIBRE 2021. [DOI: 10.1016/j.bcdf.2021.100287] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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14
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Gu X, Fu L, Pan A, Gui Y, Zhang Q, Li J. Multifunctional alkalophilic α-amylase with diverse raw seaweed degrading activities. AMB Express 2021; 11:139. [PMID: 34669086 PMCID: PMC8528909 DOI: 10.1186/s13568-021-01300-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 10/12/2021] [Indexed: 12/15/2022] Open
Abstract
Uncultured microbes are an important resource for the discovery of novel enzymes. In this study, an amylase gene (amy2587) that codes a protein with 587 amino acids (Amy2587) was obtained from the metagenomic library of macroalgae-associated bacteria. Recombinant Amy2587 was expressed in Escherichia coli BL21 (DE3) and was found to simultaneously possess α-amylase, agarase, carrageenase, cellulase, and alginate lyase activities. Moreover, recombinant Amy2587 showed high thermostability and alkali resistance which are important characteristics for industrial application. To investigate the multifunctional mechanism of Amy2587, three motifs (functional domains) in the Amy2587 sequence were deleted to generate three truncated Amy2587 variants. The results showed that, even though these functional domains affected the multiple substrates degrading activity of Amy2587, they did not wholly explain its multifunctional characteristics. To apply the multifunctional activity of Amy2587, three seaweed substrates (Grateloupia filicina, Chondrus ocellatus, and Scagassum) were digested using Amy2587. After 2 h, 6 h, and 24 h of digestion, 121.2 ± 4 µg/ml, 134.8 ± 6 µg/ml, and 70.3 ± 3.5 µg/ml of reducing sugars were released, respectively. These results show that Amy2587 directly and effectively degraded three kinds of raw seaweeds. This finding provides a theoretical basis for one-step enzymatic digestion of raw seaweeds to obtain seaweed oligosaccharides.
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Ding N, Zhao B, Ban X, Li C, Venkataram Prasad BV, Gu Z, Li Z. Carbohydrate-Binding Module and Linker Allow Cold Adaptation and Salt Tolerance of Maltopentaose-Forming Amylase From Marine Bacterium Saccharophagus degradans 2-40 T. Front Microbiol 2021; 12:708480. [PMID: 34335544 PMCID: PMC8317173 DOI: 10.3389/fmicb.2021.708480] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 06/21/2021] [Indexed: 11/13/2022] Open
Abstract
Marine extremophiles produce cold-adapted and/or salt-tolerant enzymes to survive in harsh conditions. These enzymes are naturally evolved with unique structural features that confer a high level of flexibility, solubility and substrate-binding ability compared to mesophilic and thermostable homologs. Here, we identified and characterized an amylase, SdG5A, from the marine bacterium Saccharophagus degradans 2-40 T . We expressed the protein in Bacillus subtilis and found that the purified SdG5A enabled highly specific production of maltopentaose, an important health-promoting food and nutrition component. Notably, SdG5A exhibited outstanding cold adaptation and salt tolerance, retaining approximately 30 and 70% of its maximum activity at 4°C and in 3 M NaCl, respectively. It converted 68 and 83% of starch into maltooligosaccharides at 4 and 25°C, respectively, within 24 h, with 79% of the yield being the maltopentaose. By analyzing the structure of SdG5A, we found that the C-terminal carbohydrate-binding module (CBM) coupled with an extended linker, displayed a relatively high negative charge density and superior conformational flexibility compared to the whole protein and the catalytic domain. Consistent with our bioinformatics analysis, truncation of the linker-CBM region resulted in a significant loss in activities at low temperature and high salt concentration. This highlights the linker-CBM acting as the critical component for the protein to carry out its activity in biologically unfavorable condition. Together, our study indicated that these unique properties of SdG5A have great potential for both basic research and industrial applications in food, biology, and medical and pharmaceutical fields.
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Affiliation(s)
- Ning Ding
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi, China
| | - Boyang Zhao
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, United States
| | - Xiaofeng Ban
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi, China
| | - Caiming Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi, China
| | - B. V. Venkataram Prasad
- Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX, United States
- The Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX, United States
| | - Zhengbiao Gu
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi, China
| | - Zhaofeng Li
- State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, China
- School of Food Science and Technology, Jiangnan University, Wuxi, China
- Collaborative Innovation Center for Food Safety and Quality Control, Jiangnan University, Wuxi, China
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Tran AM, Unban K, Kanpiengjai A, Khanongnuch C, Mathiesen G, Haltrich D, Nguyen TH. Efficient Secretion and Recombinant Production of a Lactobacillal α-amylase in Lactiplantibacillus plantarum WCFS1: Analysis and Comparison of the Secretion Using Different Signal Peptides. Front Microbiol 2021; 12:689413. [PMID: 34194417 PMCID: PMC8236982 DOI: 10.3389/fmicb.2021.689413] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Accepted: 05/21/2021] [Indexed: 11/29/2022] Open
Abstract
Lactic acid bacteria (LAB) have been used as starter cultures and producers of enzymes, antimicrobial peptides or metabolites that contribute to the flavor, texture and safety of food products. Lactiplantibacillus plantarum, one of the best-studied LAB, is considered as safe and effective cell factory for food applications. In this study, our aim was to use L. plantarum as the producer for high levels of a food-grade lactobacillal α-amylase, which has potential applications in food, fermentation and feed industries. The native form of an α-amylase (AmyL) from L. plantarum S21, an amylolytic LAB isolated from Thai fermented rice noodles, was expressed in L. plantarum WCFS1 using the pSIP expression system. The secretion of the α-amylase was driven by the native signal peptides of the α-amylases from L. plantarum S21 (SP_AmyL) and Lactobacillus amylovorus NRRL B-4549 (SP_AmyA), as well as by three Sec-type signal peptides derived from L. plantarum WCFS1; Lp_2145, Lp_3050, and Lp_0373. Among the tested signal peptides, Lp_2145 appears to be the best signal peptide giving the highest total and extracellular enzymatic activities of α-amylase AmyL from L. plantarum S21, which were 13.1 and 8.1 kU/L of fermentation, respectively. These yields were significantly higher than the expression and secretion in L. plantarum WCFS1 using the native signal peptide SP_AmyL, resulting in 6.2- and 5.4-fold increase in total and extracellular activities of AmyL, respectively. In terms of secretion efficiency, Lp_0373 was observed as the most efficient signal peptide among non-cognate signal peptides for the secretion of AmyL. Real-time reverse-transcriptase quantitative PCR (RT-qPCR) was used to estimate the mRNA levels of α-amylase transcript in each recombinant strain. Relative quantification by RT-qPCR indicated that the strain with the Lp_2145 signal peptide-containing construct had the highest mRNA levels and that the exchange of the signal peptide led to a change in the transcript level of the target gene.
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Affiliation(s)
- Anh-Minh Tran
- Food Biotechnology Laboratory, Department of Food Science and Technology, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria.,Department of Biology, Faculty of Basic Sciences, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Kridsada Unban
- Division of Biotechnology, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Apinun Kanpiengjai
- Division of Biochemistry and Biochemical Technology, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand.,Research Center of Microbial Diversity and Sustainable Utilization, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand
| | - Chartchai Khanongnuch
- Division of Biotechnology, Faculty of Agro-Industry, Chiang Mai University, Chiang Mai, Thailand
| | - Geir Mathiesen
- Faculty of Chemistry, Biotechnology and Food Science, Norwegian University of Life Sciences (NMBU), Ås, Norway
| | - Dietmar Haltrich
- Food Biotechnology Laboratory, Department of Food Science and Technology, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria
| | - Thu-Ha Nguyen
- Food Biotechnology Laboratory, Department of Food Science and Technology, BOKU-University of Natural Resources and Life Sciences, Vienna, Austria
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Enhanced starch hydrolysis by α-amylase using copper oxide nanowires. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01931-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Sajjad A, Bhatti SH, Ali Z, Jaffari GH, Khan NA, Rizvi ZF, Zia M. Photoinduced Fabrication of Zinc Oxide Nanoparticles: Transformation of Morphological and Biological Response on Light Irradiance. ACS OMEGA 2021; 6:11783-11793. [PMID: 34056332 PMCID: PMC8153977 DOI: 10.1021/acsomega.1c01512] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Accepted: 04/13/2021] [Indexed: 05/23/2023]
Abstract
The photoinduced synthesis of zinc oxide nanoparticles (ZnO NPs) was carried out to unveil the effects of change in wavelength of photons. ZnO NPs were synthesized by the coprecipitation technique exposed to different light regimes [dark environment, daylight, and blue-, green-, yellow-, and red-colored light-emitting diodes (LEDs)] at room temperature. X-ray diffractogram (XRD) revealed the wurtzite structure of ZnO NPs. A small change in the size of ZnO NPs (17.11-22.56 nm) was observed with the variation in wavelength of lights from 350 to 700 nm. Spherical to hexagonal disks and rodlike surface morphologies were observed by scanning electron microscopy (SEM). The elemental composition and surface chemistry of NPs were studied by energy-dispersive X-ray diffractive (EDX) and Fourier transform infrared (FTIR) spectra. Maximum free radical quenching activity, cation radical scavenging, and total antioxidant capacity were found in ZnO NPs synthesized under green light (28.78 ± 0.18, 30.05 ± 0.21%, and 36.55 ± 2.63 μg AAE/mg, respectively). Daylight-synthesized NPs (DL-ZNPs) showed the greatest total reducing potential (15.81 ± 0.33 μg AAE/mg) and metal-chelating activity (37.77 ± 0.31%). Photoinduced ZnO NPs showed significant enzyme inhibitory effects on amylase, lipase, and urease by red-light NPs (87.49 ± 0.19%), green-light NPs (91.44 ± 0.29%), and blue-light NPs (92.17 ± 0.34%), respectively. Photoinduced ZnO NPs have been employed as nanozymes and found to exhibit intrinsic peroxidase-like activity as well. Blue-light-synthesized ZnO NPs displayed the strongest antibacterial activity (23 mm) against methicillin-resistant Staphylococcus aureus (MRSA). This study can be considered as a novel step toward the synthetic approach using LEDs to synthesize ZnO NPs with specific physicochemical properties and extends a great prospect in the environmental chemistry, food safety, and biomedical fields as nanozyme, antioxidant, antibacterial, anti-α-amylase, antiurease, and antilipase agents.
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Affiliation(s)
- Anila Sajjad
- Department
Biotechnology, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | | | - Zeeshan Ali
- School
of Chemical and Material Engineering (SCME), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan
| | | | - Nawazish Ali Khan
- Department
Physics, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | - Zarrin Fatima Rizvi
- Department
of Botany, Government College Women University, Sialkot 51310, Pakistan
| | - Muhammad Zia
- Department
Biotechnology, Quaid-i-Azam University, Islamabad 45320, Pakistan
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Production and Optimization of Xylanase and α-Amylase from Non-Saccharomyces Yeasts (Pichia membranifaciens). JOURNAL OF PURE AND APPLIED MICROBIOLOGY 2021. [DOI: 10.22207/jpam.15.1.43] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The xylanolytic and amylolytic yeasts were qualitatively determined by Cong red xylan agar and soluble starch agar plates, respectively. The most xylanase and α-amylase inducible strain (AUN-02) was selected and identified using PCR amplification of 26S rRNA gene and sequence analysis. The comparison of the alignment results and phylogenetic analysis of the sequences of the isolated yeast to published rRNA gene sequences in GenBank, confirmed the identification of the isolate as Pichia membranifaciens. Xylanase and α-amylase production by isolated P. membranifaciens were investigated at different pH values (4-8), temperature degrees (20-45°C), incubation time (1-7 days) and various substrates.A higher production of xylanase (38.8 U/mL) and a-amylase (28.7 U/mL) was obtained after 4 days of fermentation of P. membranifaciens. Higher activity of xylanase (36.83 U/mL) and a-amylase (27.7 U/mL) was obtained in the fermentation of P. membranifaciens in a culture medium adjusted to pH 7.0. The optimum temperature showed maximum xylanase and a-amylase activity (42.6 and 32.5 units/mL, respectively) was estimated at 35 °C. The xylanase and a-amylase activities of P. membranifaciens were estimated and compared for the different substrates tested. The strain revealed 100% relative activity of xylanase and a-amylase on beechwood and potato starch, respectively. The affinity of enzymes towards substrate was estimated using Km values. The Km values of xylanase and α-amylase increased in the order of pH’s 7.0, 6.0 and 4.5 (0.85, 1.6 and 3.4 mg xylan/mL and 0.22, 0.43 and 2.8 mg starch/mL, respectively). the yeast P. membranifaciensis is suitable for produce neutral xylanase and α-amylase enzymes. So, it could be used as a promising strain for production of these enzymes in industrial field.
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Rajesh R, Gummadi SN. α-Amylase and cellulase production by novel halotolerant Bacillus sp.PM06 isolated from sugarcane pressmud. Biotechnol Appl Biochem 2020; 69:149-159. [PMID: 33369761 DOI: 10.1002/bab.2091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 12/13/2020] [Indexed: 11/11/2022]
Abstract
A novel Bacillus sp.PM06 isolated from sugarcane waste pressmud was tested for extracellular α-amylase and cellulase enzyme production. The effect of different substrates, nitrogen sources, pH, and temperature on growth and extracellular enzyme production was examined. Bacillus sp.PM06 was able to grow with starch and carboxymethyl cellulose (CMC) as a sole source of carbon and ammonium chloride was found to be the best nitrogen source. Maximum enzyme production was obtained at 48 H for both α-amylase and cellulase. The optimal condition for measuring enzyme activity was found to be pH 5.5 at 50 °C for α-amylase and pH 6.4 at 60 °C for cellulase respectively. It was found that Bacillus sp.PM06 exhibited halotolerance up to 2 M Sodium chloride (NaCl) and Potassium chloride (KCl). The isolate could produce α-amylase in the presence of 2 M NaCl and 1 M KCl. However, the strain produced cellulase even in the presence of 2 M NaCl and KCl. Concomitant production of both enzymes was observed when the medium was supplemented with starch and CMC. A maximum of 31 ± 1.15 U/mL of amylase and 15 ± 1.5 U/mL of cellulase was produced in 48 H. The enzyme was partially purified by Ammonium sulphate (NH4 )2 SO4 precipitation with 2.2 and 2.3-fold purification.
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Affiliation(s)
- Rekha Rajesh
- Applied and Industrial Microbiology Laboratory, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai, India
| | - Sathyanarayana N Gummadi
- Applied and Industrial Microbiology Laboratory, Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai, India
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21
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Song Y, Sun K, Liu R. An exploration of the interaction mechanism of Direct Red 80 with α-Amylase at the molecular level. J Mol Recognit 2020; 34:e2883. [PMID: 33331039 DOI: 10.1002/jmr.2883] [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: 10/11/2020] [Revised: 11/04/2020] [Accepted: 11/23/2020] [Indexed: 12/23/2022]
Abstract
The use and production of Direct Red 80 (DR80) dye are growing rapidly, and a large amount of dye wastewater is discharged into the soil without treatment. DR80 accumulated in soil or sludge can lead to enzyme poisoning, inhibit microbial activity, and affect the transformation of substances in the soil. In this research, the interaction mechanism between DR80 and α-Amylase (a typical enzyme in soil and sludge) was investigated by multi-spectra, molecular docking, thermodynamics analysis and enzyme activity experiment. The results of UV-visible and resonance light scattering (RLS) spectra showed that the skeleton of α-Amylase became loosened and unfolded under the exposure of Direct Red. The size of α-Amylase was smaller and α-Amylase became dispersed under high concentration of DR80. Molecular docking and thermodynamic analysis showed that DR80 bound to the surface of domain A rather than the active site of α-Amylase in the form of hydrogen bonds, and the binding process was an exothermic reaction. In addition, the inhibition of α-Amylase activity by DR80 was verified by enzyme activity experiment. These results indicate that DR80 has an effect on the structure and function of α-Amylase at molecular level, which means that the toxicity of DR80 should receive more attention.
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Affiliation(s)
- Yan Song
- School of Water Conservancy and Environment, University of Jinan, Jinan, China
| | - Kailun Sun
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, Qingdao, China
| | - Rutao Liu
- School of Environmental Science and Engineering, Shandong University, China-America CRC for Environment & Health, Qingdao, China
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Bhatt K, Lal S, Srinivasan R, Joshi B. Molecular analysis of Bacillus velezensis KB 2216, purification and biochemical characterization of alpha-amylase. Int J Biol Macromol 2020; 164:3332-3339. [PMID: 32871125 DOI: 10.1016/j.ijbiomac.2020.08.205] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/17/2020] [Accepted: 08/27/2020] [Indexed: 11/18/2022]
Abstract
Alpha-amylase producing strain KB 2216 was identified as Bacillus velezensis. The growth pattern showed that 72 h is the optimum incubation period of amylase production, which is a stationary period for the strain. By the purification process, maximum alpha-amylase activity was achieved up to 418.25 U/mL at 72 h of incubation, which was purified with 4.74 folds, 4230.32 U/mg specific activity, with 31.35% yield. The strain was found to produce an oligomeric alpha-amylase, namely Amy3. Amy3 was a trimeric macromolecule of 195 kDa with 62, 64, and 66 kDa subunits, as revealed by zymogram and SDS PAGE analyses. Amy3 was highly active at 55 °C and pH 5.5. It had shown the highest stability at pH 5.0-5.5 and between 0 ̊C and 4 ̊C. It did not require any metal cofactors, but it was inhibited by Ag2+, Hg2+ and Cd2+ divalent cations. Glucose and maltose were shown to be the end products of soluble starch digestion by Amy3. These interesting properties of Amy3 may be useful for many biotechnological applications in the future.
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Affiliation(s)
- Kandarp Bhatt
- Department of Microbiology, Bundelkhand University, Jhansi, Uttar Pradesh 284128, India.
| | - Sangeeta Lal
- Department of Microbiology, Bundelkhand University, Jhansi, Uttar Pradesh 284128, India
| | - R Srinivasan
- Indian Grassland and Fodder Research Institute, Jhansi, Uttar Pradesh 284003, India
| | - Bhumika Joshi
- Department of Pharmaceutical Sciences, Saurashtra University, Rajkot, Gujarat 360005, India
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Alpha-amylase conjugated biogenic silver nanoparticles as innovative strategy against biofilm-forming multidrug resistant bacteria. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2020. [DOI: 10.1016/j.bcab.2020.101784] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Gonzalez A, Wang Y. Enhancing the Formation of Porous Potato Starch by Combining α‐Amylase or Glucoamylase Digestion with Acid Hydrolysis. STARCH-STARKE 2020. [DOI: 10.1002/star.201900269] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ana Gonzalez
- Department of Food ScienceUniversity of Arkansas 2650 N. Young Avenue Fayetteville AR 72704 USA
| | - Ya‐Jane Wang
- Department of Food ScienceUniversity of Arkansas 2650 N. Young Avenue Fayetteville AR 72704 USA
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Kumar A, Sahu C, Panda PA, Biswal M, Sah RP, Lal MK, Baig MJ, Swain P, Behera L, Chattopadhyay K, Sharma S. Phytic acid content may affect starch digestibility and glycemic index value of rice (Oryza sativa L.). JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2020; 100:1598-1607. [PMID: 31773736 DOI: 10.1002/jsfa.10168] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 11/20/2019] [Accepted: 11/21/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND Phytic acid (PA) is an anti-nutrient present in cereals and pulses. It is known to reduce mineral bioavailability and inhibit starch-digesting α-amylase (which requires calcium for activity) in the human gut. In principle, the greater the amount of PA, the lower is the rate of starch hydrolysis. It is reflected in the lower glycemic index (GI) value of food. People leading sedentary lifestyles and consuming rice as a staple food are likely to develop type 2 diabetes. Hence, this study was planned to understand how PA content of different rice varieties affects the GI. RESULTS Rice Khira and Mugai which had very low PA (0.30 and 0.36 g kg-1 , respectively) had higher GI values and α-amylase activity, while Nua Dhusara and the pigmented rice Manipuri black rice (MBR) which had high PA (2.13 and 2.98 g kg-1 , respectively) showed low α-amylase activity and GI values. This relationship was statistically significant, though a weak relationship was found for the pigmented rice. Expression levels of MIPSI, IPKI and GBSSI markedly increased in the middle stage of grain development in all of the six genotypes having contrasting PA and GI. Maximum expression of MIPSI and IPKI was observed in Nua Dhusara and MBR (which had high PA) while that of GBSSI was observed in Khira and Mugai (with higher GI) at middle stage showing a negative correlation between PA and GI. CONCLUSIONS The data indicate that high PA content in rice might have an adverse effect on starch digestibility resulting in slower starch digestion in the human gut and consequently low glycemic response. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Awadhesh Kumar
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Chandrasekhar Sahu
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Puja A Panda
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Monalisa Biswal
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Rameswar P Sah
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Milan K Lal
- Division of Crop Physiology, Biochemistry and Post Harvest Technology, ICAR-Central Potato Research Institute, Shimla, India
| | - Mirza J Baig
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Padmini Swain
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Lambodar Behera
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Krishnendu Chattopadhyay
- Crop Physiology and Biochemistry Division, Crop Improvement Division ICAR-National Rice Research Institute, Cuttack, India
| | - Srigopal Sharma
- College of Basic Sciences and Humanities, Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, India
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Bashary R, Vyas M, Nayak SK, Suttee A, Verma S, Narang R, Khatik GL. An Insight of Alpha-amylase Inhibitors as a Valuable Tool in the Management of Type 2 Diabetes Mellitus. Curr Diabetes Rev 2020; 16:117-136. [PMID: 31237215 DOI: 10.2174/1573399815666190618093315] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/14/2019] [Accepted: 05/05/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Among the millions of people around the world, the most prevalent metabolic disorder is diabetes mellitus. Due to the drawbacks which are associated with commercially available antidiabetic agents, new therapeutic approaches are needed to be considered. Alpha-amylase is a membrane- bound enzyme which is responsible for the breakdown of polysaccharides such as starch to monosaccharides which can be absorbed. METHODS We searched the scientific database using alpha-amylase, diabetes, antidiabetic agents as the keywords. Here in, only peer-reviewed research articles were collected which were useful to our current work. RESULTS To overcome the research gap, the alpha-amylase enzyme is regarded as a good target for antidiabetic agents to design the drug and provide an alternate approach for the treatment of type 2 diabetes mellitus. Basically, alpha-amylase inhibitors are classified into two groups: proteinaceous inhibitors, and non-proteinaceous inhibitors. Recently, non-proteinaceous inhibitors are being explored which includes chalcones, flavones, benzothiazoles, etc. as the potential antidiabetic agents. CONCLUSION Herein, we discuss various potential antidiabetic agents which are strategically targeted alpha-amylase enzyme. These are having lesser side effects as compared to other antidiabetic agents, and are proposed to prevent the digestion and absorption of glucose leading to a decrease in the blood glucose level.
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Affiliation(s)
- Roqia Bashary
- Department of Pharmaceutical Chemistry, Kabul University, Kabul, Afghanistan
| | - Manish Vyas
- School of Pharmaceutical Sciences, Lovely Professional University, Jalandhar-Delhi G.T. Road, Phagwara, Punjab, 144411, India
| | - Surendra Kumar Nayak
- School of Pharmaceutical Sciences, Lovely Professional University, Jalandhar-Delhi G.T. Road, Phagwara, Punjab, 144411, India
| | - Ashish Suttee
- School of Pharmaceutical Sciences, Lovely Professional University, Jalandhar-Delhi G.T. Road, Phagwara, Punjab, 144411, India
| | - Surajpal Verma
- School of Pharmaceutical Sciences, Lovely Professional University, Jalandhar-Delhi G.T. Road, Phagwara, Punjab, 144411, India
| | - Rakesh Narang
- Institute of Pharmaceutical Sciences, Kurukshetra University, Kurukshetra, Haryana, 136119, India
| | - Gopal L Khatik
- School of Pharmaceutical Sciences, Lovely Professional University, Jalandhar-Delhi G.T. Road, Phagwara, Punjab, 144411, India
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Cao C, Li C, Chen Q, Huang Q, Pérez MEM, Fu X. Physicochemical characterization, potential antioxidant and hypoglycemic activity of polysaccharide from Sargassum pallidum. Int J Biol Macromol 2019; 139:1009-1017. [PMID: 31401282 DOI: 10.1016/j.ijbiomac.2019.08.069] [Citation(s) in RCA: 40] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Revised: 08/03/2019] [Accepted: 08/07/2019] [Indexed: 02/02/2023]
Abstract
A polysaccharide, designated as PSP-1, was isolated and purified from Sargassum pallidum. Physicochemical characterization showed that PSP-1 with the average molecular weight of 1.036 × 106 Da was composed of fucose, arabinose, galactose, glucose, xylose, mannose, galacturonic acid and glucuronic acid in a molar ratio of 18.45:2.15:19.06:1.89:16.07:1.00:5.74:20.09. The results of antioxidant assays indicated that PSP-1 had good DPPH radical scavenging activity, hydroxyl radical scavenging activity, cellular antioxidant activity, and reactive oxygen species inhibition activity, and could significantly improve cellular antioxidant enzymes of ABAP-induced HepG2 cell model. The results of hypoglycemic assays showed that PSP-1 possessed favorable α-amylase and α-glucosidase inhibitory activities, and could remarkably enhance glucose consumption, glycogen synthesis and the activities of pyruvate kinase and hexokinase in insulin-resistance HepG2 cells. The results suggest that PSP-1 can be exploited as a potential antioxidant and hypoglycemic candidate for functional and nutraceutical applications.
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Affiliation(s)
- Changliang Cao
- School of Food Science and Engineering, National Research Center for Tropical Health Food, South China University of Technology, Guangzhou 510640, China
| | - Chao Li
- School of Food Science and Engineering, National Research Center for Tropical Health Food, South China University of Technology, Guangzhou 510640, China; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510640, China.
| | - Qing Chen
- Department of Food, Guangzhou City Polytechnic, Guangzhou 510405, China
| | - Qiang Huang
- School of Food Science and Engineering, National Research Center for Tropical Health Food, South China University of Technology, Guangzhou 510640, China; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510640, China
| | | | - Xiong Fu
- School of Food Science and Engineering, National Research Center for Tropical Health Food, South China University of Technology, Guangzhou 510640, China; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510640, China.
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Sunday RM, Obuotor EM, Kumar A. Antidiabetic Effect of Asparagus adscendens Roxb. in RIN-5F Cells, HepG2 Cells, and Wistar Rats. CANADIAN JOURNAL OF BIOTECHNOLOGY 2019. [DOI: 10.24870/cjb.2019-000129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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29
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Kannan TR, Kanagaraj C. Molecular characteristic of α-AMYLASE enzymes producing from Bacillus lichenformis (JQ946317) using solid state fermentation. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101240] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Hashim SO. Starch-Modifying Enzymes. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2019; 172:221-244. [PMID: 30937486 DOI: 10.1007/10_2019_91] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Starch is a carbohydrate polymer found abundantly on earth. It is synthesized in plants as a short-term storage compound for respiration in the leaves and for long-term storage in the tubers, seeds and roots of plants. A wide variety of enzymes modify or convert starch into various products. The classes of enzymes that act on starch include endoamylases, exoamylases, debranching enzymes and transferases. Starch-modifying enzymes of microbial origin are utilized in a wide variety of industrial applications. Alkaline-active amylases are diverse in terms of optimum reaction conditions, substrate and product specificity. Amylases that are active at lower temperatures and alkaline conditions are most suited for detergent formulation. Other notable starch-modifying enzymes from alkaliphiles include maltooligosaccharide-forming amylases and cyclodextrin glycosyltransferases (CGTases), which produce a variety of maltooligosaccharides and cyclodextrins, respectively. Such compounds are used in the food, fine chemical, pharmaceutical and cosmetic industries, among others. Alkaline-active amylases are also applicable in the paper, textile and leather industries and also in bioremediation and alkaline waste water treatment. Their application in these fields is further enhanced through stabilization and improving their specificity and catalytic action by employing nanotechnology and genetic engineering. Graphical Abstract *Alkaline alpha-amylase AmyK from Bacillus sp. KSM-1378. Shirai T, Igarashi K, Ozawa T, Hagihara H, Kobayashi T, Ozaki K, Ito S (2007) Proteins 66:600-610. Source: Protein Data Bank in Europe (PDBe).
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Affiliation(s)
- Suhaila Omar Hashim
- Department of Biochemistry and Biotechnology, Pwani University, Kilifi, Kenya.
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Popiołek I, Niziołek A, Kamiński K, Kwolek U, Nowakowska M, Szczubiałka K. Cellular delivery and enhanced anticancer activity of berberine complexed with a cationic derivative of γ–cyclodextrin. Bioorg Med Chem 2019; 27:1414-1420. [DOI: 10.1016/j.bmc.2019.02.042] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 02/18/2019] [Accepted: 02/20/2019] [Indexed: 12/24/2022]
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Neupane S, Patnode K, Li H, Baryeh K, Liu G, Hu J, Chen B, Pan Y, Yang Z. Enhancing Enzyme Immobilization on Carbon Nanotubes via Metal-Organic Frameworks for Large-Substrate Biocatalysis. ACS APPLIED MATERIALS & INTERFACES 2019; 11:12133-12141. [PMID: 30839195 DOI: 10.1021/acsami.9b01077] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Biocatalysis of large-sized substrates finds wide applications. Immobilizing the involved enzymes on solid supports improves biocatalysis yet faces challenges such as enzyme structural perturbation, leaching, and low cost-efficiencies, depending on immobilization strategies/matrices. Carbon nanotubes (CNTs) are attractive matrices but challenged by enzyme leaching (physical adsorption) or perturbation (covalent linking). Zeolitic imidazolate frameworks (ZIFs) overcome these issues. However, our recent study [ J. Am. Chem. Soc., 2018, 140, 16032-16036] showed reduced cost-efficiency as enzymes trapped below the ZIF surfaces cannot participate in biocatalysis; the enzyme-ZIF composites are also unstable under acidic conditions. In this work, we demonstrate the feasibility of using ZIFs to immobilize enzymes on CNT surfaces on two model enzymes, T4 lysozyme and amylase, both of which showed negligible leaching and retained catalytic activity under neutral and acidic conditions. To better understand the behavior of enzymes on CNTs and CNT-ZIF, we characterized enzyme orientation on both matrices using site-directed spin-labeling (SDSL)-electron paramagnetic resonance (EPR), which is immune to the complexities caused by CNT and ZIF background signals and enzyme-matrix interactions. Our structural investigations showed enhanced enzyme exposure to the solvent compared to enzymes in ZIFs alone; orientation of enzymes in matrices itself is directly related to substrate accessibility and, therefore, essential for understanding and improving catalytic efficiency. To the best of our knowledge, this is the first time ZIFs and one-pot synthesis are employed to anchor large-substrate enzymes on CNT surfaces for biocatalysis. This is also the first report of enzyme orientation on the CNT surface and upon trapping in CNT-ZIF composites. Our results are essential for guiding the rational design of CNT-ZIF combinations to improve enzyme stabilization, loading capacity, and catalytic efficiency.
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Affiliation(s)
| | | | | | | | | | - Jinlian Hu
- Institute of Textiles and Clothing , The Hong Kong Polytechnic University , Kowloon 999077 , Hong Kong , China
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Bashary R, Khatik GL. Design, and facile synthesis of 1,3 diaryl-3-(arylamino)propan-1-one derivatives as the potential alpha-amylase inhibitors and antioxidants. Bioorg Chem 2019; 82:156-162. [DOI: 10.1016/j.bioorg.2018.10.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 09/21/2018] [Accepted: 10/04/2018] [Indexed: 02/07/2023]
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Salar U, Khan KM, Chigurupati S, Syed S, Vijayabalan S, Wadood A, Riaz M, Ghufran M, Perveen S. New Hybrid Scaffolds based on Hydrazinyl Thiazole Substituted Coumarin; As Novel Leads of Dual Potential; In Vitro α-Amylase Inhibitory and Antioxidant (DPPH and ABTS Radical Scavenging) Activities. Med Chem 2019; 15:87-101. [PMID: 30179139 DOI: 10.2174/1573406414666180903162243] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 06/24/2018] [Accepted: 08/25/2018] [Indexed: 11/22/2022]
Abstract
Background:
Despite many side effects associated, there are many drugs which are
being clinically used for the treatment of type-II diabetes mellitus (DM). In this scenario, there is
still need to develop new therapeutic agents with more efficacy and less side effects. By keeping in
mind the diverse spectrum of biological potential associated with coumarin and thiazole, a hybrid
class based on these two heterocycles was synthesized.
Method:
Hydrazinyl thiazole substituted coumarins 4-20 were synthesized via two step reaction.
First step was the acid catalyzed reaction of 3-formyl/acetyl coumarin derivatives with thiosemicarbazide
to form thiosemicarbazone intermediates 1-3, followed by the reaction with different
phenacyl bromides to afford products 4-20. All the synthetic analogs 4-20 were characterized by
different spectroscopic techniques such as EI-MS, HREI-MS, 1H-NMR and 13C-NMR. Stereochemical
assignment of the iminic double bond was carried out by the NOESY experiments. Elemental
analysis was found in agreement with the calculated values.
Results:
Compounds 4-20 were screened for α-amylase inhibitory activity and showed good activity
in the range of IC50 = 1.829 ± 0.102-3.37 ± 0.17 µM as compared to standard acarbose (IC50 =
1.819 ± 0.19 µM). Compounds were also investigated for their DPPH and ABTS radical scavenging
activities and displayed good radical scavenging potential. In addition to that molecular modelling
study was conducted on all compounds to investigate the interaction details of compounds 4-20 (ligands) with active site (receptor) of enzyme.
Conclusion:
The newly identified hybrid class may serve as potential lead candidates for the management
of diabetes mellitus.
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Affiliation(s)
- Uzma Salar
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Khalid M. Khan
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Sridevi Chigurupati
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, AIMST University, Semeling, 08100 Bedong, Kedah, Malaysia
| | - Shazia Syed
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi-75270, Pakistan
| | - Shantini Vijayabalan
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, AIMST University, Semeling, 08100 Bedong, Kedah, Malaysia
| | - Abdul Wadood
- Department of Biochemistry, Computational Medicinal Chemistry Laboratory, UCSS, Abdul Wali Khan University, Mardan, Pakistan
| | - Muhammad Riaz
- Department of Biochemistry, Computational Medicinal Chemistry Laboratory, UCSS, Abdul Wali Khan University, Mardan, Pakistan
| | - Mehreen Ghufran
- Department of Biochemistry, Computational Medicinal Chemistry Laboratory, UCSS, Abdul Wali Khan University, Mardan, Pakistan
| | - Shahnaz Perveen
- PCSIR Laboratories Complex, Karachi, Shahrah-e-Dr. SalimuzzamanSiddiqui, Karachi-75280, Pakistan
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Naeem F, Nadeem H, Muhammad A, Zahid MA, Saeed A. Synthesis, α-Amylase Inhibitory Activity and Molecular Docking Studies of 2,4-Thiazolidinedione Derivatives. ACTA ACUST UNITED AC 2018. [DOI: 10.2174/1874842201805010134] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Introduction:2,4-Thiazolidinedione and its derivatives exhibit a variety of pharmacological activities including antidiabetic, antiviral, antifungal, anti-inflammatory, anti-cancer and aldose reductase inhibitory activities. Keeping in mind the pharmacological potential of 2,4-Thiazolidinedione derivatives as antidiabetic agents, seven arylidene derivatives of 2,4-thiazolidinedione1(a-g)and four corresponding acetic acid derivatives 2(a-d)have been synthesized by a three-step procedure.Methods:All the synthesized compounds were characterized by elemental analysis, FTIR,1HNMR, and13CNMR and further screened for their α-amylase inhibitory potential.Results:All the compounds1(a-g)and2(a-d)showed varying degree of α-amylase inhibition, especially compound1c(IC50= 6.59μg/ml),1d(IC50=2.03μg/ml) and1g(IC50= 3.14μg/ml) displayed significantly potent α-amylase inhibition as compared to the standard acarbose (IC50= 8.26μg/ml). None of the acetic acid derivatives of 5-arylidene-2,4-thiazolidinedione showed prominent inhibitory activity. Docking results indicated that the best binding conformation was found inside the active site cleft of enzyme responsible for hydrolysis of carbohydrates.Conclusion:Therefore, it can be concluded that 2,4-thiazolidinedione derivatives can be used as effective lead molecules for the development of α-amylase inhibitors for the management of diabetes.
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Shi J, Deng Q, Li Y, Zheng M, Chai Z, Wan C, Zheng Z, Li L, Huang F, Tang B. A Rapid and Ultrasensitive Tetraphenylethylene-Based Probe with Aggregation-Induced Emission for Direct Detection of α-Amylase in Human Body Fluids. Anal Chem 2018; 90:13775-13782. [DOI: 10.1021/acs.analchem.8b04244] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jie Shi
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Jinan 250014, China
| | - Qianchun Deng
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Ya Li
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Mingming Zheng
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Zhaofei Chai
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071, China
| | - Chuyun Wan
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Zhe Zheng
- Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
| | - Lu Li
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Jinan 250014, China
| | - Fenghong Huang
- Hubei Key Laboratory of Lipid Chemistry and Nutrition, Key Laboratory of Oilseeds Processing, Ministry of Agriculture, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Shandong Provincial Key Laboratory of Clean Production of Fine Chemicals, Shandong Normal University, Jinan 250014, China
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37
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In vitro evaluation of the anti-digestion and antioxidant effects of grape seed procyanidins according to their degrees of polymerization. J Funct Foods 2018. [DOI: 10.1016/j.jff.2018.08.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Khan BM, Cheong KL, Liu Y. ATPS: “Aqueous two-phase system” as the “answer to protein separation” for protein-processing food industry. Crit Rev Food Sci Nutr 2018; 59:3165-3178. [PMID: 29883189 DOI: 10.1080/10408398.2018.1486283] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Bilal Muhammad Khan
- Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UNIVPM Joint Algal Research Center, Department of Biology, College of Science, Shantou University, Shantou, Guangdong, PR China
| | - Kit-Leong Cheong
- Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UNIVPM Joint Algal Research Center, Department of Biology, College of Science, Shantou University, Shantou, Guangdong, PR China
| | - Yang Liu
- Guangdong Provincial Key Laboratory of Marine Biotechnology, STU-UNIVPM Joint Algal Research Center, Department of Biology, College of Science, Shantou University, Shantou, Guangdong, PR China
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Molecular Cloning and Characterization of a Novel α-Amylase from Antarctic Sea Ice Bacterium Pseudoalteromonas sp. M175 and Its Primary Application in Detergent. BIOMED RESEARCH INTERNATIONAL 2018; 2018:3258383. [PMID: 30050926 PMCID: PMC6040283 DOI: 10.1155/2018/3258383] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 04/06/2018] [Accepted: 05/02/2018] [Indexed: 11/17/2022]
Abstract
A novel cold-adapted and salt-tolerant α-amylase gene (amy175) from Antarctic sea ice bacterium Pseudoalteromonas sp. M175 was successfully cloned and expressed. The open reading frame (ORF) of amy175 had 1722 bp encoding a protein of 573 amino acids residues. Multiple alignments indicated Amy175 had seven highly conserved sequences and the putative catalytic triad (Asp244, Glu286, and Asp372). It was the first identified member of GH13_36 subfamily which contained QPDLN in the CSR V. The recombinant enzyme (Amy175) was purified to homogeneity with a molecular mass of about 62 kDa on SDS-PAGE. It had a mixed enzyme specificity of α-amylase and α-glucosidase. Amy175 displayed highest activity at pH 8.0 and 25°C and exhibited extreme salt-resistance with the maximum activity at 1 M NaCl. Amy175 was strongly stimulated by Mg2+, Ni2+, K+, 1 mM Ca2+, 1 mM Ba2+, 1 mM Pb2+, 1 mM sodium dodecyl sulphate (SDS), and 10% dimethyl sulfoxide (DMSO) but was significantly inhibited by Cu2+, Mn2+, Hg2+, 10 mM β-mercaptoethanol (β-ME), and 10% Tween 80. Amy175 demonstrated excellent resistance towards all the tested commercial detergents, and wash performance analysis displayed that the addition of Amy175 improved the stain removal efficiency. This study demonstrated that Amy175 would be proposed as a novel α-amylase source for industrial application in the future.
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40
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Cao C, Huang Q, Zhang B, Li C, Fu X. Physicochemical characterization and in vitro hypoglycemic activities of polysaccharides from Sargassum pallidum by microwave-assisted aqueous two-phase extraction. Int J Biol Macromol 2018; 109:357-368. [PMID: 29273524 DOI: 10.1016/j.ijbiomac.2017.12.096] [Citation(s) in RCA: 79] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 12/14/2017] [Accepted: 12/18/2017] [Indexed: 11/29/2022]
Abstract
Microwave-assisted aqueous two-phase extraction (MAATPE) was applied for simultaneous extraction and separation of polysaccharides from Sargassum pallidum (SPPs). The optimal extraction parameters, physicochemical properties, and hypoglycemic activities in vitro of SPPs were investigated. The results revealed that the optimal extraction conditions were as follows: 21.0% ethanol (w/w) and 22.0% ammonium sulfate (w/w) for ATPS, ratio of material to liquid 1:60 (g/mL), extraction time 15 min, microwave power 830 W, and extraction temperature 95 °C. Under the optimal these conditions, the maximum yields of SPPs were 0.75 ± 0.04% of the top phase (SPP-1) and 6.81 ± 0.33% of the bottom phase (SPP-2). SPP-1 and SPP-2 were homogeneous with molecular weights of 1518.6 and 50.6 kDa, respectively. SPP-1 mainly consisted of fucose, galactose, mannose, and glucuronic acid with a molar ratio of 4.97:9.75:6.44:6.07, whereas SPP-2 was mainly composed of fucose, galactose, glucose, and mannose with a molar ratio of 4.20:2.88:18.05:7.83. SPP-1 and SPP-2 exhibited favorable α-amylase and α-glucosidase inhibitory activities, and could remarkably improve glucose consumption in insulin resistance (IR) model cells. Notably, SPP-1 exhibited stronger α-glucosidase inhibitory activity than SPP-2, and even was comparable with acarbose.
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Affiliation(s)
- Changliang Cao
- School of Food Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China
| | - Qiang Huang
- School of Food Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China
| | - Bin Zhang
- School of Food Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China
| | - Chao Li
- School of Food Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, China.
| | - Xiong Fu
- School of Food Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, China; Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Guangzhou 510640, China.
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Mohamed SA, Al-Harbi MH, Almulaiky YQ, Ibrahim IH, Salah HA, El-Badry MO, Abdel-Aty AM, Fahmy AS, El-Shishtawy RM. Immobilization of Trichoderma harzianum α-amylase on PPyAgNp/Fe3O4-nanocomposite: chemical and physical properties. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2018; 46:201-206. [DOI: 10.1080/21691401.2018.1453828] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Saleh A. Mohamed
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Majed H. Al-Harbi
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Yaaser Q. Almulaiky
- Biochemistry Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia
| | - Ibrahim H. Ibrahim
- Biochemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Hala A. Salah
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | | | - Azza M. Abdel-Aty
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Afaf S. Fahmy
- Molecular Biology Department, National Research Centre, Dokki, Cairo, Egypt
| | - Reda M. El-Shishtawy
- Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
- Dyeing, Printing and Textile Auxiliaries Department, Textile Research Division, National Research Centre, Dokki, Cairo, Egypt
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Belakhov VV, Garabadzhiu AV. A New Sorption Method for the Production of Bacillus subtilis α-Amylase with the Use of FAF Microfine Anion Exchanger. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363217130023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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Zhao C, Yang C, Liu B, Lin L, Sarker SD, Nahar L, Yu H, Cao H, Xiao J. Bioactive compounds from marine macroalgae and their hypoglycemic benefits. Trends Food Sci Technol 2018. [DOI: 10.1016/j.tifs.2017.12.001] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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44
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Balasubramanian A, Bhattacharjee M, Sakthivel M, Thirumavalavan M, Madhavan T, Nagarajan SK, Palaniyandi V, Raman P. Isolation, purification and characterization of proteinaceous fungal α-amylase inhibitor from rhizome of Cheilocostus speciosus (J.Koenig) C.D.Specht. Int J Biol Macromol 2018; 111:39-51. [PMID: 29305211 DOI: 10.1016/j.ijbiomac.2017.12.158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Revised: 12/27/2017] [Accepted: 12/29/2017] [Indexed: 11/18/2022]
Abstract
As the aim of this present study, a proteinaceous α-amylase inhibitor has been isolated from the rhizome of Cheilocostus specious (C. speciosus) and was purified using DEAE cellulose anion exchange chromatography followed by gel filtration using Sephacryl-S-200 column. The purity and molecular mass of the purified inhibitor was determined by SDS-PAGE and LC-MS respectively. The molecular mass of the purified inhibitor was determined to be 31.18kDa. Protein-protein docking was also carried out as molecular model. Model validation methods such as Ramachandran plot and Z-score plot were adopted to validate the structural description (sequence analysis) of proteins. The inhibitory activity was confirmed using spectrophotometric and reverse zymogram analyses. This 31.18kDa protein from C. speciosus inhibited the activity of fungal α-amylase by 71% at the level of ion exchange chromatography and 96% after gel filtration. The inhibition activity of the α-amylase inhibitor was stable and high at optimum pH6 (52.2%) and temperatures of 30-40°C (72.2%). Thus it was suggested that the main responsible for the versatile biological and pharmacological activities of C. speciosus is due to its primary metabolites (proteins) only.
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Affiliation(s)
- Abinaya Balasubramanian
- Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India
| | - Manish Bhattacharjee
- Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India
| | - Meenakumari Sakthivel
- Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India
| | - Munusamy Thirumavalavan
- Graduate Institute of Environmental Engineering, National Central University, Chungli, Taoyuan County 320, Taiwan.
| | - Thirumurthy Madhavan
- Department of Genetic Engineering, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India
| | - Santhosh Kumar Nagarajan
- Department of Genetic Engineering, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India
| | - Velusamy Palaniyandi
- Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India
| | - Pachaiappan Raman
- Department of Biotechnology, School of Bioengineering, SRM University, Kattankulathur 603203, Tamilnadu, India; Metabolomics, Proteomics and Mass Spectrometry Core Facilities, EEJMRB, 15 N Medical Drive East RM A306 (Basement), University of Utah, Salt Lake City, UT 84112-5650, USA.
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45
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Salar U, Khan KM, Chigurupati S, Taha M, Wadood A, Vijayabalan S, Ghufran M, Perveen S. New Hybrid Hydrazinyl Thiazole Substituted Chromones: As Potential α-Amylase Inhibitors and Radical (DPPH & ABTS) Scavengers. Sci Rep 2017; 7:16980. [PMID: 29209017 PMCID: PMC5717224 DOI: 10.1038/s41598-017-17261-w] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 11/16/2017] [Indexed: 12/22/2022] Open
Abstract
Current research is based on the identification of novel inhibitors of α-amylase enzyme. For that purpose, new hybrid molecules of hydrazinyl thiazole substituted chromones 5-27 were synthesized by multi-step reaction and fully characterized by various spectroscopic techniques such as EI-MS, HREI-MS, 1H-NMR and 13C-NMR. Stereochemistry of the iminic bond was confirmed by NOESY analysis of a representative molecule. All compounds 5-27 along with their intervening intermediates 1-4, were screened for in vitro α-amylase inhibitory, DPPH and ABTS radical scavenging activities. All compounds showed good inhibition potential in the range of IC50 = 2.186-3.405 µM as compared to standard acarbose having IC50 value of 1.9 ± 0.07 µM. It is worth mentioning that compounds were also demonstrated good DPPH (IC50 = 0.09-2.233 µM) and ABTS (IC50 = 0.584-3.738 µM) radical scavenging activities as compared to standard ascorbic acid having IC50 = 0.33 ± 0.18 µM for DPPH and IC50 = 0.53 ± 0.3 µM for ABTS radical scavenging activities. In addition to that cytotoxicity of the compounds were checked on NIH-3T3 mouse fibroblast cell line and found to be non-toxic. In silico studies were performed to rationalize the binding mode of compounds (ligands) with the active site of α-amylase enzyme.
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Affiliation(s)
- Uzma Salar
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan
| | - Khalid Mohammed Khan
- H. E. J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, Karachi, 75270, Pakistan.
| | - Sridevi Chigurupati
- Department of Pharmaceutical chemistry, Faculty of Pharmacy, AIMST University, Semeling, 08100, Bedong, Kedah, Malaysia
| | - Muhammad Taha
- Department of Clinical Pharmacy, Institute for Research and Medical Consultations (IRMC), Imam Abdulrahman Bin Faisal University, Dammam, P.O. Box 31441, Saudi Arabia
| | - Abdul Wadood
- Department of Biochemistry, Computational Medicinal Chemistry Laboratory, UCSS, Abdul Wali Khan University, Mardan, Pakistan
| | - Shantini Vijayabalan
- Department of Pharmaceutical chemistry, Faculty of Pharmacy, AIMST University, Semeling, 08100, Bedong, Kedah, Malaysia
| | - Mehreen Ghufran
- Department of Biochemistry, Computational Medicinal Chemistry Laboratory, UCSS, Abdul Wali Khan University, Mardan, Pakistan
| | - Shahnaz Perveen
- PCSIR Laboratories Complex, Karachi, Shahrah-e-Dr. SalimuzzamanSiddiqui, Karachi, 75280, Pakistan
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46
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Johnson P, Krishnan V, Loganathan C, Govindhan K, Raji V, Sakayanathan P, Vijayan S, Sathishkumar P, Palvannan T. Rapid biosynthesis of Bauhinia variegata flower extract-mediated silver nanoparticles: an effective antioxidant scavenger and α-amylase inhibitor. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2017; 46:1488-1494. [DOI: 10.1080/21691401.2017.1374283] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Preethi Johnson
- Department of Biochemistry, Periyar University, Salem, India
| | | | | | | | - Vijayan Raji
- Department of Biochemistry, Periyar University, Salem, India
| | | | - Sudha Vijayan
- Department of Biochemistry, Periyar University, Salem, India
| | - Palanivel Sathishkumar
- Centre for Environmental Sustainability and Water Security (IPASA), Universiti Teknologi Malaysia, Johor Bahru, Malaysia
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47
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Rasouli H, Hosseini-Ghazvini SMB, Adibi H, Khodarahmi R. Differential α-amylase/α-glucosidase inhibitory activities of plant-derived phenolic compounds: a virtual screening perspective for the treatment of obesity and diabetes. Food Funct 2017; 8:1942-1954. [PMID: 28470323 DOI: 10.1039/c7fo00220c] [Citation(s) in RCA: 211] [Impact Index Per Article: 30.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Recently, due to their biological properties, polyphenol-rich functional foods have been proposed to be unique supplementary and nutraceutical treatments for diabetes mellitus. Inhibition of α-amylase and α-glucosidase enzymes using natural products (especially polyphenols) is a novel oral policy to regulate carbohydrate metabolism and hyperglycemia. The present study aims to evaluate the α-amylase and α-glucosidase inhibitory activity of 26 polyphenols using molecular docking and virtual screening studies. The results speculate that among selected compounds caffeic acid, curcumin, cyanidin, daidzein, epicatechin, eridyctiol, ferulic acid, hesperetin, narenginin, pinoresinol, quercetin, resveratrol and syringic acid can significantly inhibit the α-glucosidase enzyme. In addition, catechin, hesperetin, kaempferol, silibinin and pelargonidin are potent α-amylase inhibitors. Therefore the primary structure of polyphenols can change the inhibitory effect versus the α-amylase and α-glucosidase enzymes. Finally, we speculate that consumption of polyphenol-rich functional foods (by considering the best dose of each compound and assessing their possible side effects) in diabetic patients may be useful for regulating carbohydrate metabolism and related disorders. The findings of the current study may also shed light on a way of generating a new class of amylase/glucosidase inhibitors that will discriminately inhibit the on-target enzymes with negligible undesired off-target side effects.
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Affiliation(s)
- Hassan Rasouli
- Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran.
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48
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49
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Santorelli M, Maurelli L, Pocsfalvi G, Fiume I, Squillaci G, La Cara F, Del Monaco G, Morana A. Isolation and characterisation of a novel alpha-amylase from the extreme haloarchaeon Haloterrigena turkmenica. Int J Biol Macromol 2016; 92:174-184. [PMID: 27377461 DOI: 10.1016/j.ijbiomac.2016.07.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 06/30/2016] [Accepted: 07/01/2016] [Indexed: 10/21/2022]
Abstract
An extracellular halophilic alpha-amylase (AmyA) was produced by the haloarchaeon Haloterrigena turkmenica grown in medium enriched with 0.2% (w/v) starch. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and size exclusion chromatography (SEC) analyses showed a major band at 66.0kDa and a peak of 54.0kDa, respectively. Analysis of tryptic fragments of the protein present in the major SDS-PAGE band by nano-LC-ESI-MS/MS led to identification of the alpha-amylase catalytic region, encoded by the htur2110 gene, as the protein possessing the described activity. Optimal values for activity were 55°C, pH 8.5 and 2M NaCl, and high thermostability was showed at 55°C and 3M NaCl. AmyA activity was enhanced by Triton X-100 and was not influenced by n-hexane and chloroform. Starch hydrolysis produced different oligomers with maltose as the smallest end-product. The efficiency of AmyA in degrading starch contained in agronomic residues was tested in grape cane chosen as model substrate. Preliminary results showed that starch was degraded making the enzyme a potential candidate for utilization of agro-industrial waste in fuel and chemicals production. AmyA is one of the few investigated amylases produced by haloarchaea, and the first alpha-amylase described among microorganisms belonging to the genus Haloterrigena.
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Affiliation(s)
- Marco Santorelli
- Department of Chemical, Materials and Production Engineering, University of Naples "Federico II", P.le Tecchio 80, 80125 Napoli, Italy
| | - Luisa Maurelli
- Institute of Biosciences and Bioresources, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Gabriella Pocsfalvi
- Institute of Biosciences and Bioresources, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Immacolata Fiume
- Institute of Biosciences and Bioresources, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Giuseppe Squillaci
- Institute of Agro-environmental and Forest Biology, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Francesco La Cara
- Institute of Agro-environmental and Forest Biology, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Giovanni Del Monaco
- Institute of Biosciences and Bioresources, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Alessandra Morana
- Institute of Agro-environmental and Forest Biology, National Research Council of Italy, Via Pietro Castellino 111, 80131 Naples, Italy.
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50
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Mechanisms underlying the effect of polysaccharides in the treatment of type 2 diabetes: A review. Carbohydr Polym 2016; 144:474-94. [DOI: 10.1016/j.carbpol.2016.02.040] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 01/18/2016] [Accepted: 02/14/2016] [Indexed: 12/11/2022]
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