1
|
Meng Y, Peplowski L, Wu T, Cheng Z, Han L, Qiao J, Cheng Z, Zhou Z. Multi-method analysis revealed the mechanism of substrate selectivity in NHase: A gatekeeper residue at the activity center. Int J Biol Macromol 2024; 279:135426. [PMID: 39251006 DOI: 10.1016/j.ijbiomac.2024.135426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Revised: 08/27/2024] [Accepted: 09/06/2024] [Indexed: 09/11/2024]
Abstract
Recognizing the critical need to elucidate the molecular determinants of this selectivity offers a pathway to engineer enzymes with broader and more versatile catalytic capabilities. Through integrated methods including phylogenetic analysis, molecular docking, and structural analysis, we identified a pivotal amino acid residue, αTrp116, linking the substrate binding pocket and the active site of a NHase from Pseudonocardia thermophila JCM 3095 (PtNHase). This residue acts as a crucial determinant of substrate specificity within the NHase enzyme. The mutant αW116R modified the substrate specificity of PtNHase, significantly enhancing its catalytic efficiency towards aromatic substrates. The catalytic activity for aromatic compounds such as 3-Cyanopyridine was 14-fold that of the wild-type, whereas its activity for aliphatic substrates diminished to one-sixth. MD simulations revealed that replacing αTrp116 with Arg allowed aromatic nitrile substrates to achieve more favorable conformations within the active site. Based on the mutant αW116R, we further constructed a combinatorial variant Pt-4, tailored for aromatic substrates, which exhibited an enzyme activity 50 times that of the wild-type. These results highlight the critical influence of amino acid residues in the enzyme's active site on substrate specificity and offer fresh perspectives and approaches for the evolution of enzymes.
Collapse
Affiliation(s)
- Yiwei Meng
- Key Laboratory of Industrial Biotechnology (Ministry of Education), School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Lukasz Peplowski
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, 87-100 Torun, Poland
| | - Tong Wu
- Key Laboratory of Industrial Biotechnology (Ministry of Education), School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Zhongyi Cheng
- Key Laboratory of Industrial Biotechnology (Ministry of Education), School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Laichuang Han
- Key Laboratory of Industrial Biotechnology (Ministry of Education), School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Jun Qiao
- Ningbo Institute of Marine Medicine, Peking University, China
| | - Zhongyi Cheng
- Key Laboratory of Industrial Biotechnology (Ministry of Education), School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China.
| | - Zhemin Zhou
- Key Laboratory of Industrial Biotechnology (Ministry of Education), School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China; Jiangnan University (Rugao) Food Biotechnology Research Institute, Rugao, Jiangsu, China.
| |
Collapse
|
2
|
Wang M, Li F, Yu H. Enhancing the stress resistance of nitrile hydratase from Rhodococcus ruber via SpyTag/SpyCatcher-mediated α- and β- subunits ligation. Mol Biol Rep 2024; 51:817. [PMID: 39012451 DOI: 10.1007/s11033-024-09760-7] [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: 04/24/2024] [Accepted: 06/25/2024] [Indexed: 07/17/2024]
Abstract
BACKGROUND Nitrile Hydratase (NHase) is one of the most important industrial enzyme widely used in the petroleum exploitation field. The enzyme, composed of two unrelated α- and β-subunits, catalyzes the conversion of acrylonitrile to acrylamide, releasing a significant amount of heat and generating the organic solvent product, acrylamide. Both the heat and acrylamide solvent have an impact on the structural stability of NHase and its catalytic activity. Therefore, enhancing the stress resistance of NHase to toxic substances is meaningful for the petroleum industry. METHODS AND RESULTS To improve the thermo-stability and acrylamide tolerance of NHase, the two subunits were fused in vivo using SpyTag and SpyCatcher, which were attached to the termini of each subunit in various combinations. Analysis of the engineered strains showed that the C-terminus of β-NHase is a better fusion site than the N-terminus, while the C-terminus of α-NHase is the most suitable site for fusion with a larger protein. Fusion of SpyTag and SpyCatcher to the C-terminus of β-NHase and α-NHase, respectively, led to improved acrylamide tolerance and a slight enhancement in the thermo-stability of one of the engineered strains, NBSt. CONCLUSION These results indicate that in vivo ligation of different subunits using SpyTag/SpyCatcher is a valuable strategy for enhancing subunit interaction and improving stress tolerance.
Collapse
Affiliation(s)
- Miaomiao Wang
- Beijing Evolyzer Co., Ltd, Beijing, 100176, China.
- Key Laboratory of Industrial Biocatalysis, Ministry of Education, Beijing, China.
- Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
| | - Fulong Li
- Beijing Evolyzer Co., Ltd, Beijing, 100176, China
| | - Huimin Yu
- Key Laboratory of Industrial Biocatalysis, Ministry of Education, Beijing, China
- Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China
| |
Collapse
|
3
|
"Toolbox" construction of an extremophilic nitrile hydratase from Streptomyces thermoautotrophicus for the promising industrial production of various amides. Int J Biol Macromol 2022; 221:1103-1111. [PMID: 36108746 DOI: 10.1016/j.ijbiomac.2022.09.071] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 08/23/2022] [Accepted: 09/08/2022] [Indexed: 11/23/2022]
Abstract
Nitrile hydratase (NHase; EC 4.2.1.84) is widely used to synthesize the corresponding amides from nitriles, which is the most successful green biocatalyst. However, the limited acceptability of substrates and instability under harsh reaction conditions have hindered its widespread industrial application. Here, a gene encoding an extremophilic NHase from Streptomyces thermoautotrophicus (S.t NHase) was successfully overexpressed in Escherichia coli. The enzyme exhibited excellent thermostability, retaining >50 % of residual activity after heat treatment at 65 °C for 252 min. To further improve the catalytic performance of S.t NHase, semi-rational engineering of its substrate access tunnel was performed. A mutant βL48D showed a specific activity of 566.18 ± 18.86 U/mg towards 3-cyanopyridine, which was 7.7 times higher than its parent enzyme (73.80 ± 5.76 U/mg). Molecular dynamics simulation showed that the introduction of aspartic acid into βLeu48 resulted in a larger and more frequent opening of the substrate access tunnel entrance. On this basis, a "toolbox" containing various mutants on the substrate access tunnel was further established, whose catalytic activity towards various nitrile substrates was extensively improved, showing great potential for efficient synthesis of multiple high-value amides.
Collapse
|
4
|
Van Wyk JC, Sewell BT, Danson MJ, Tsekoa TL, Sayed MF, Cowan DA. Engineering enhanced thermostability into the Geobacillus pallidus nitrile hydratase. Curr Res Struct Biol 2022; 4:256-270. [PMID: 36106339 PMCID: PMC9465369 DOI: 10.1016/j.crstbi.2022.07.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Revised: 06/27/2022] [Accepted: 07/19/2022] [Indexed: 11/20/2022] Open
Abstract
Nitrile hydratases (NHases) are important biocatalysts for the enzymatic conversion of nitriles to industrially-important amides such as acrylamide and nicotinamide. Although thermostability in this enzyme class is generally low, there is not sufficient understanding of its basis for rational enzyme design. The gene expressing the Co-type NHase from the moderate thermophile, Geobacillus pallidus RAPc8 (NRRL B-59396), was subjected to random mutagenesis. Four mutants were selected that were 3 to 15-fold more thermostable than the wild-type NHase, resulting in a 3.4–7.6 kJ/mol increase in the activation energy of thermal inactivation at 63 °C. High resolution X-ray crystal structures (1.15–1.80 Å) were obtained of the wild-type and four mutant enzymes. Mutant 9E, with a resolution of 1.15 Å, is the highest resolution crystal structure obtained for a nitrile hydratase to date. Structural comparisons between the wild-type and mutant enzymes illustrated the importance of salt bridges and hydrogen bonds in enhancing NHase thermostability. These additional interactions variously improved thermostability by increased intra- and inter-subunit interactions, preventing cooperative unfolding of α-helices and stabilising loop regions. Some hydrogen bonds were mediated via a water molecule, specifically highlighting the significance of structured water molecules in protein thermostability. Although knowledge of the mutant structures makes it possible to rationalize their behaviour, it would have been challenging to predict in advance that these mutants would be stabilising. Random mutagenesis yields a 15-fold increase in nitrile hydratase thermostability. Salt bridges and hydrogen bonds improves nitrile hydratase thermostability. Water-mediated hydrogen bonds improves protein thermostability.
Collapse
|
5
|
Sun S, Zhou J, Jiang J, Dai Y, Sheng M. Nitrile Hydratases: From Industrial Application to Acetamiprid and Thiacloprid Degradation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:10440-10449. [PMID: 34469128 DOI: 10.1021/acs.jafc.1c03496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The widespread application of neonicotinoid insecticides (NEOs) in agriculture causes a series of environmental and ecological problems. Microbial remediation is a popular approach to relieve these negative impacts, but the associated molecular mechanisms are rarely explored. Nitrile hydratase (NHase), an enzyme commonly used in industry for amide production, was discovered to be responsible for the degradation of acetamiprid (ACE) and thiacloprid (THI) by microbes. Since then, research into NHases in NEO degradation has attracted increasing attention. In this review, microbial degradation of ACE and THI is briefly described. We then focus on NHase evolution, gene composition, maturation mechanisms, expression, and biochemical properties with regard to application of NHases in NEO degradation for bioremediation.
Collapse
Affiliation(s)
- Shilei Sun
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province and School of Life Science, Jiangsu Normal University, Xuzhou 221116, People's Republic of China
| | - Jiangsheng Zhou
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province and School of Life Science, Jiangsu Normal University, Xuzhou 221116, People's Republic of China
| | - Jihong Jiang
- The Key Laboratory of Biotechnology for Medicinal Plants of Jiangsu Province and School of Life Science, Jiangsu Normal University, Xuzhou 221116, People's Republic of China
| | - Yijun Dai
- Jiangsu Key Laboratory for Microbes and Functional Genomics, Jiangsu Engineering and Technology Research Center for Industrialization of Microbial Resources, College of Life Science, Nanjing Normal University, Nanjing 210023, People's Republic of China
| | - Miaomiao Sheng
- College of Pharmacy, Zhejiang Chinese Medical University, Hangzhou 310053, People's Republic of China
| |
Collapse
|
6
|
Shen JD, Cai X, Ni YW, Jin LQ, Liu ZQ, Zheng YG. Structural insights into the thermostability mechanism of a nitrile hydratase from Caldalkalibacillus thermarum by comparative molecular dynamics simulation. Proteins 2021; 89:978-987. [PMID: 33749895 DOI: 10.1002/prot.26076] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 02/19/2021] [Accepted: 03/13/2021] [Indexed: 11/07/2022]
Abstract
Nitrile hydratase (NHase), an excellent bio-catalyst for the synthesis of amide compounds, was composed of two heterologous subunits. A thermoalkaliphilic NHase NHCTA1 (Tm = 71.3°C) obtained by in silico screening in our study exhibited high flexibility of α-subunit but excellent thermostability, as opposed to previous examples. To gain a deeper structural insight into the thermostability of NHCTA1, comparative molecular dynamics simulation of NHCTA1 and reported NHases was carried out. By comparison, we speculated that β-subunit played a key role in adjusting the flexibility of α-subunit and the different conformations of linker in "α5-helix-coil ring" supersecondary structure of β-subunit can affect the interaction between β-subunit and α-subunit. Mutant NHCTA1-α6 C with a random coil linker and mutant NHCTA1-αβγ with a truncated linker were therefore constructed to understand the impact on NHCTA1 thermostability by varying the supersecondary structure. The varied thermostability of NHCTA1-α6 C and NHCTA1-αβγ (Tmα6C = 74.4°C, Tmαβγ = 65.6°C) verified that the flexibility of α-subunit adjusted by β-subunit was relevant to the stability of NHCTA1. This study gained an insight into the NNHCTA1 thermostability by virtual dynamics comparison and experimental studies without crystallization, and this approach could be applied to other industrial-important enzymes.
Collapse
Affiliation(s)
- Ji-Dong Shen
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, China
| | - Xue Cai
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, China
| | - Ye-Wen Ni
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, China
| | - Li-Qun Jin
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, China
| | - Zhi-Qiang Liu
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, China
| | - Yu-Guo Zheng
- The National and Local Joint Engineering Research Center for Biomanufacturing of Chiral Chemicals, Zhejiang University of Technology, Hangzhou, China
- Key Laboratory of Bioorganic Synthesis of Zhejiang Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, China
| |
Collapse
|
7
|
Cheng Z, Zhang W, Xia Y, Ma D, Zhou Z. An anchoring residue adjacent to the substrate access tunnel entrance of a nitrile hydratase directs its catalytic activity towards 3-cyanopyridine. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01566d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The residue βGlu50 located adjacent to the substrate access tunnel entrance of the nitrile hydratase from Pseudonocardia thermophila JCM3095 acts as an anchoring residue that directs the enzymatic activity.
Collapse
Affiliation(s)
- Zhongyi Cheng
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Weimiao Zhang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Yuanyuan Xia
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Dong Ma
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Zhemin Zhou
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
- Jiangnan University (Rugao) Food Biotechnology Research Institute, Rugao 226500, Jiangsu, China
| |
Collapse
|
8
|
Cheng Z, Lan Y, Guo J, Ma D, Jiang S, Lai Q, Zhou Z, Peplowski L. Computational Design of Nitrile Hydratase from Pseudonocardia thermophila JCM3095 for Improved Thermostability. Molecules 2020; 25:molecules25204806. [PMID: 33086715 PMCID: PMC7587978 DOI: 10.3390/molecules25204806] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 10/08/2020] [Accepted: 10/16/2020] [Indexed: 11/16/2022] Open
Abstract
High thermostability and catalytic activity are key properties for nitrile hydratase (NHase, EC 4.2.1.84) as a well-industrialized catalyst. In this study, rational design was applied to tailor the thermostability of NHase from Pseudonocardia thermophila JCM3095 (PtNHase) by combining FireProt server prediction and molecular dynamics (MD) simulation. Site-directed mutagenesis of non-catalytic residues provided by the rational design was subsequentially performed. The positive multiple-point mutant, namely, M10 (αI5P/αT18Y/αQ31L/αD92H/βA20P/βP38L/βF118W/βS130Y/βC189N/βC218V), was obtained and further analyzed. The Melting temperature (Tm) of the M10 mutant showed an increase by 3.2 °C and a substantial increase in residual activity of the enzyme at elevated temperatures was also observed. Moreover, the M10 mutant also showed a 2.1-fold increase in catalytic activity compared with the wild-type PtNHase. Molecular docking and MD simulations demonstrated better substrate affinity and improved thermostability for the mutant.
Collapse
Affiliation(s)
- Zhongyi Cheng
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
| | - Yao Lan
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
| | - Junling Guo
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
| | - Dong Ma
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
| | - Shijin Jiang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
| | - Qianpeng Lai
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
| | - Zhemin Zhou
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China; (Z.C.); (Y.L.); (J.G.); (D.M.); (S.J.); (Q.L.)
- Jiangnan University (Rugao) Food Biotechnology Research Institute, Rugao 226500, China
- Correspondence: (Z.Z.); (L.P.)
| | - Lukasz Peplowski
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, Grudziadzka 5, 87-100 Torun, Poland
- Correspondence: (Z.Z.); (L.P.)
| |
Collapse
|
9
|
Cheng Z, Xia Y, Zhou Z. Recent Advances and Promises in Nitrile Hydratase: From Mechanism to Industrial Applications. Front Bioeng Biotechnol 2020; 8:352. [PMID: 32391348 PMCID: PMC7193024 DOI: 10.3389/fbioe.2020.00352] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Accepted: 03/30/2020] [Indexed: 12/21/2022] Open
Abstract
Nitrile hydratase (NHase, EC 4.2.1.84) is one type of metalloenzyme participating in the biotransformation of nitriles into amides. Given its catalytic specificity in amide production and eco-friendliness, NHase has overwhelmed its chemical counterpart during the past few decades. However, unclear catalytic mechanism, low thermostablity, and narrow substrate specificity limit the further application of NHase. During the past few years, numerous studies on the theoretical and industrial aspects of NHase have advanced the development of this green catalyst. This review critically focuses on NHase research from recent years, including the natural distribution, gene types, posttranslational modifications, expression, proposed catalytic mechanism, biochemical properties, and potential applications of NHase. The developments of NHase described here are not only useful for further application of NHase, but also beneficial for the development of the fields of biocatalysis and biotransformation.
Collapse
Affiliation(s)
| | | | - Zhemin Zhou
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| |
Collapse
|
10
|
Pei X, Wu Y, Wang J, Chen Z, Liu W, Su W, Liu F. Biomimetic mineralization of nitrile hydratase into a mesoporous cobalt-based metal-organic framework for efficient biocatalysis. NANOSCALE 2020; 12:967-972. [PMID: 31840718 DOI: 10.1039/c9nr06470b] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Nitrile hydratases (NHases) have attracted considerable attention owing to their application in the synthesis of valuable amides under mild conditions. However, the poor stability of NHases is still one of the main drawbacks for their industrial application. Recently, mesoporous metal-organic frameworks (MOFs) have been explored as an attractive support material for immobilizing enzymes. Here, we encapsulated a recombinant cobalt-type NHase from Aurantimonas manganoxydans into the cobalt-based MOF ZIF-67 by a biomimetic mineralization strategy. The nano-catalyst NHase1229@ZIF-67 shows high catalytic activity for the hydration of 3-cyanopyridine to nicotinamide, and its specific activity reached 29.5 U mg-1. The NHase1229@ZIF-67 nanoparticles show a significant improvement in the thermal stability of NHase1229. The optimum reaction temperature of NHase1229@ZIF-67 is at 50-55 °C, and it still retained 40% of the maximum activity at 70 °C. However, the free NHase1229 completely lost its catalytic activity at 70 °C. The half-lives of NHase1229@ZIF-67 at 30 and 40 °C were 102.0 h and 26.5 h, respectively. NHase1229@ZIF-67 nanoparticles exhibit an excellent cycling performance, and their catalytic efficiency did not significantly decrease in the initial 6 cycles using 0.9 M 3-cyanopyridine as the substrate. In a fed-batch reaction, NHase1229@ZIF-67 can efficiently hydrate 3-cyanopyridine to nicotinamide, and the space-time yield was calculated to be 110 g·L-1·h-1. Therefore, the cobalt-type NHase was immobilized in MOF ZIF-67, which is shown as a potential nanocatalyst for the large-scale industrial preparation of nicotinamide.
Collapse
Affiliation(s)
- Xiaolin Pei
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 310012, PR China.
| | | | | | | | | | | | | |
Collapse
|
11
|
Jiao S, Li F, Yu H, Shen Z. Advances in acrylamide bioproduction catalyzed with Rhodococcus cells harboring nitrile hydratase. Appl Microbiol Biotechnol 2019; 104:1001-1012. [DOI: 10.1007/s00253-019-10284-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 11/20/2019] [Accepted: 11/26/2019] [Indexed: 01/10/2023]
|