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Improvement in the Environmental Stability of Haloalkane Dehalogenase with Self-Assembly Directed Nano-Hybrid with Iron Phosphate. Catalysts 2022. [DOI: 10.3390/catal12080825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Haloalkane dehalogenase (DhaA) catalyzes the hydrolysis of halogenated compounds through the cleavage of carbon halogen bonds. However, the low activity, poor environmental stability, and difficult recycling of free DhaA greatly increases the economic cost of practical application. Inspired by the organic–inorganic hybrid system, an iron-based hybrid nanocomposite biocatalyst FeHN@DhaA is successfully constructed to enhance its environmental tolerability. A series of characterization methods demonstrate that the synthesized enzyme–metal iron complexes exhibit granular nanostructures with good crystallinity. Under optimized conditions, the activity recovery and the effective encapsulation yield of FeHN@DhaA are 138.54% and 87.21%, respectively. Moreover, it not only exhibits excellent immobilized enzymatic properties but also reveals better tolerance to extreme acid, and is alkali compared with the free DhaA. In addition, the immobilized enzyme FeHN@DhaA can be easily recovered and has a satisfactory reusability, retaining 57.8% of relative activity after five reaction cycles. The results of this study might present an alternative immobilized DhaA-based clean biotechnology for the decontamination of organochlorine pollutants.
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Biodiesel production from microalgae using lipase-based catalysts: Current challenges and prospects. ALGAL RES 2022. [DOI: 10.1016/j.algal.2021.102616] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Shan Y, Yu W, Shen L, Guo X, Zheng H, Zhong J, Hu T, Han Y. Conjugation with inulin improves the environmental stability of haloalkane dehalogenase DhaA. Enzyme Microb Technol 2021; 149:109832. [PMID: 34311877 DOI: 10.1016/j.enzmictec.2021.109832] [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: 04/05/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 10/21/2022]
Abstract
Haloalkane dehalogenase DhaA catalyzes the hydrolytic cleavage of carbon-halogen bonds and produces alcohol, a proton and a halide. However, DhaA suffers from the poor environmental stability, such as sensitivity to high temperature, low pH, hypersaline and organic solvent. In order to improve the environmental stability of DhaA, DhaA was covalently conjugated with inulin, a hydrophilic polysaccharide in the present study. Each DhaA was averagely conjugated with 7∼8 inulin molecules. The conjugated inulin could form a hydration layer around DhaA, which increased the conformational rigidity and decreased the entropy of the enzyme. Conjugation of inulin maintained 75.5 % of the enzymatic activity of DhaA and slightly altered the structure of DhaA. As compared with DhaA, the conjugate (inu-DhaA) showed slightly different kinetic parameters (Km of 2.9 μmol/L and Kcat of 1.0 s-1). Inulin conjugation could delay the structural unfolding and/or slow the protonation process of DhaA under undesirable environment, including the long-term storage, low pH, hypersaline and organic solvent stability. As a result, the environmental stability of DhaA was markedly increased upon conjugation with inulin. Thus, inulin conjugation was an effective approach to enhance the environmental stability of DhaA.
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Affiliation(s)
- Yue Shan
- College of Life Sciences, Liaoning Normal University, Dalian, 116081, Liaoning Province, China; State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Weili Yu
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Lijuan Shen
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
| | - Xuan Guo
- State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defense, Beijing, 102205, China
| | - He Zheng
- State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defense, Beijing, 102205, China
| | - Jinyi Zhong
- State Key Laboratory of NBC Protection for Civilian, Research Institute of Chemical Defense, Beijing, 102205, China.
| | - Tao Hu
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China.
| | - Yinglun Han
- College of Life Sciences, Liaoning Normal University, Dalian, 116081, Liaoning Province, China.
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Gul I, Wang Q, Jiang Q, Fang R, Tang L. Enzyme immobilization on glass fiber membrane for detection of halogenated compounds. Anal Biochem 2020; 609:113971. [PMID: 32979368 DOI: 10.1016/j.ab.2020.113971] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 09/15/2020] [Accepted: 09/17/2020] [Indexed: 01/19/2023]
Abstract
Enzyme immobilization using inorganic membranes has enticed increased attention as they not only improve enzyme stability, but also furnish user-friendly biodevices that can be tailored to different applications. Herein, we explored the suitability of the glass fiber membrane for enzyme immobilization and its application for halocarbon detection. For this, halohydrin dehalogenase (HheC) and bovine serum albumin were crosslinked and immobilized on a glass fiber membrane without membrane functionalization. Immobilized HheC exhibited higher storage stability than its free counterpart over 60 days at 4 °C (67% immobilized vs. 8.1% free) and 30 °C (77% immobilized vs. 57% free). Similarly, the thermal endurance of the immobilized HheC was significantly improved. The practical utility of the membrane-immobilized enzyme was demonstrated by colorimetric detection of 1,3-dichloro-2-propanol (1,3-DCP) and 2,3-dibromo-1-propanol (2,3-DBP) as model analytes. Under optimized conditions, the detection limits of 0.06 mM and 0.09 mM were achieved for 1,3-DCP and 2,3-DBP, respectively. The satisfactory recoveries were observed with spiked river and lake water samples, which demonstrate the application potential of immobilized HheC for screening contaminants in water samples. Our results revealed that the proposed frugal and facile approach could be useful for enzyme stabilization, and mitigation of halocarbon pollution.
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Affiliation(s)
- Ijaz Gul
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Qian Wang
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Qifa Jiang
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Ruiqin Fang
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 610054, China; Center for Informational Biology, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Lixia Tang
- School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, 610054, China; Center for Informational Biology, University of Electronic Science and Technology of China, Chengdu, 610054, China.
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Zheng H, Yang SJ, Zheng YC, Cui Y, Zhang Z, Zhong JY, Zhou J. Electrostatic Effect of Functional Surfaces on the Activity of Adsorbed Enzymes: Simulations and Experiments. ACS APPLIED MATERIALS & INTERFACES 2020; 12:35676-35687. [PMID: 32649833 DOI: 10.1021/acsami.0c08080] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The efficient immobilization of haloalkane dehalogenase (DhaA) on carriers with retaining of its catalytic activity is essential for its application in environmental remediation. In this work, adsorption orientation and conformation of DhaA on different functional surfaces were investigated by computer simulations; meanwhile, the mechanism of varying the catalytic activity was also probed. The corresponding experiments were then carried out to verify the simulation results. (The simulations of DhaA on SAMs provided parallel insights into DhaA adsorption in carriers. Then, the theory-guided experiments were carried out to screen the best surface functional groups for DhaA immobilization.) The electrostatic interaction was considered as the main impact factor for the regulation of enzyme orientation, conformation, and enzyme bioactivity during DhaA adsorption. The synergy of overall conformation, enzyme substrate tunnel structural parameters, and distance between catalytic active sites and surfaces codetermined the catalytic activity of DhaA. Specifically, it was found that the positively charged surface with suitable surface charge density was helpful for the adsorption of DhaA and retaining its conformation and catalytic activity and was favorable for higher enzymatic catalysis efficiency in haloalkane decomposition and environmental remediation. The neutral, negatively charged surfaces and positively charged surfaces with high surface charge density always caused relatively larger DhaA conformation change and decreased catalytic activity. This study develops a strategy using a combination of simulation and experiment, which can be essential for guiding the rational design of the functionalization of carriers for enzyme adsorption, and provides a practical tool to rationally screen functional groups for the optimization of adsorbed enzyme functions on carriers. More importantly, the strategy is general and can be applied to control behaviors of different enzymes on functional carrier materials.
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Affiliation(s)
- He Zheng
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China
| | - Sheng-Jiang Yang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Yong-Chao Zheng
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China
| | - Yan Cui
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China
| | - Zhe Zhang
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China
| | - Jin-Yi Zhong
- State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China
| | - Jian Zhou
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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Wang H, Duan B, Li H, Li S, Lu Y, Liu Z, Su W. PEGylation and macroporous carrier adsorption enabled long-term enzymatic transesterification. NEW J CHEM 2020. [DOI: 10.1039/c9nj05265h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel enzyme catalyst with excellent stability and catalytic efficiency expected to be used in the ERD industry was prepared.
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Affiliation(s)
- Honghai Wang
- School of Chemical Engineering
- Hebei University of Technology
- Tianjin 300130
- China
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization
| | - Baoxuan Duan
- School of Chemical Engineering
- Hebei University of Technology
- Tianjin 300130
- China
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization
| | - Hao Li
- School of Chemical Engineering
- Hebei University of Technology
- Tianjin 300130
- China
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization
| | - Shihao Li
- Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering of the Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Yifan Lu
- School of Chemical Engineering
- Hebei University of Technology
- Tianjin 300130
- China
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization
| | - Zhiling Liu
- School of Chemical Engineering
- Hebei University of Technology
- Tianjin 300130
- China
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization
| | - Weiyi Su
- School of Chemical Engineering
- Hebei University of Technology
- Tianjin 300130
- China
- National-Local Joint Engineering Laboratory for Energy Conservation of Chemical Process Integration and Resources Utilization
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Wang F, Song T, Jiang H, Pei C, Huang Q, Xi H. Bacillus subtilis Spore Surface Display of Haloalkane Dehalogenase DhaA. Curr Microbiol 2019; 76:1161-1167. [PMID: 31278426 DOI: 10.1007/s00284-019-01723-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 06/19/2019] [Indexed: 12/18/2022]
Abstract
The haloalkane dehalogenase DhaA can degrade sulfur mustard (2,2'-dichlorethyl sulfide; also known by its military designation HD) in a rapid and environmentally safe manner. However, DhaA is sensitive to temperature and pH, which limits its applications in natural or harsh environments. Spore surface display technology using resistant spores as a carrier to ensure enzymatic activity can reduce production costs and extend the range of applications of DhaA. To this end, we cloned recombinant Bacillus subtilis spores pHY300PLK-cotg-dhaa-6his/DB104(FH01) for the delivery of DhaA from Rhodococcus rhodochrous NCIMB 13064. A dot blotting showed that the fusion protein CotG-linker-DhaA accounted for 0.41% ± 0.03% (P < 0.01) of total spore coat proteins. Immunofluorescence analyses confirmed that DhaA was displayed on the spore surface. The hydrolyzing activity of DhaA displayed on spores towards the HD analog 2-chloroethyl ethylsulfide was 1.74 ± 0.06 U/mL (P < 0.01), with a specific activity was 0.34 ± 0.04 U/mg (P < 0.01). This is the first demonstration that DhaA displayed on the surface of B. subtilis spores retains enzymatic activity, which suggests that it can be used effectively in real-world applications including bioremediation of contaminated environments.
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Affiliation(s)
- Fuli Wang
- Research Institute of Chemical Defense, Academy of Military Sciences, Beijing, 102205, People's Republic of China.,State Key Laboratory of NBC Protection for Civilian, Academy of Military Sciences, Beijing, 102205, People's Republic of China
| | - Tianyu Song
- Research Institute of Chemical Defense, Academy of Military Sciences, Beijing, 102205, People's Republic of China.,State Key Laboratory of NBC Protection for Civilian, Academy of Military Sciences, Beijing, 102205, People's Republic of China
| | - Hui Jiang
- Research Institute of Chemical Defense, Academy of Military Sciences, Beijing, 102205, People's Republic of China.,State Key Laboratory of NBC Protection for Civilian, Academy of Military Sciences, Beijing, 102205, People's Republic of China
| | - Chengxin Pei
- Research Institute of Chemical Defense, Academy of Military Sciences, Beijing, 102205, People's Republic of China.,State Key Laboratory of NBC Protection for Civilian, Academy of Military Sciences, Beijing, 102205, People's Republic of China
| | - Qibin Huang
- Research Institute of Chemical Defense, Academy of Military Sciences, Beijing, 102205, People's Republic of China.,State Key Laboratory of NBC Protection for Civilian, Academy of Military Sciences, Beijing, 102205, People's Republic of China
| | - Hailing Xi
- Research Institute of Chemical Defense, Academy of Military Sciences, Beijing, 102205, People's Republic of China. .,State Key Laboratory of NBC Protection for Civilian, Academy of Military Sciences, Beijing, 102205, People's Republic of China.
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