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Engineer AS, Yadav KK, Kshirsagar PR, Dhakephalkar PK. A novel, enantioselective, thermostable recombinant hydantoinase to aid the synthesis of industrially valuable non-proteinogenic amino acids. Enzyme Microb Technol 2020; 138:109554. [PMID: 32527524 DOI: 10.1016/j.enzmictec.2020.109554] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Revised: 03/11/2020] [Accepted: 03/17/2020] [Indexed: 11/19/2022]
Abstract
Overexpression of a novel hydantoinase (hyuH) from P. aeruginosa (MCM B-887) in E. coli yielded optically pure carbamoyl amino acids. The use of optically pure carbamoyl amino acids as substrates facilitates the synthesis of non-proteinogenic amino acids. The enzyme hyuH shared a maximum of 92 % homology with proven hydantoinase protein sequences from the GenBank database, highlighting its novelty. Expression of hydantoinase gene was improved by >150 % by overexpressing it as a fusion protein in specialized E. coli CODON + host cells, providing adequate machinery for effective translation of the GC-rich gene. The presence of distinct residues in the substrate binding and active site of MCM B-887 hydantoinase enzyme explained its unique and broad substrate profile desirable for industrial applications. The purified enzyme, with a specific activity of 53U/mg of protein, was optimally active at 42 °C and pH 9.0 with a requirement of 2 mM Mn2+ ions. Supplementation of 500 mM of Na-glutamate enhanced the thermostability of the enzyme by more than 200 %.
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Affiliation(s)
| | - Kunal K Yadav
- Agharkar Research Institute, G.G. Agarkar Road, Pune, 411004, India
| | - Pranav R Kshirsagar
- Agharkar Research Institute, G.G. Agarkar Road, Pune, 411004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India
| | - Prashant K Dhakephalkar
- Agharkar Research Institute, G.G. Agarkar Road, Pune, 411004, India; Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India.
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Zhu L, Zhou L, Huang N, Cui W, Liu Z, Xiao K, Zhou Z. Efficient preparation of enantiopure D-phenylalanine through asymmetric resolution using immobilized phenylalanine ammonia-lyase from Rhodotorula glutinis JN-1 in a recirculating packed-bed reactor. PLoS One 2014; 9:e108586. [PMID: 25268937 PMCID: PMC4182499 DOI: 10.1371/journal.pone.0108586] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Accepted: 08/22/2014] [Indexed: 11/18/2022] Open
Abstract
An efficient enzymatic process was developed to produce optically pure D-phenylalanine through asymmetric resolution of the racemic DL-phenylalanine using immobilized phenylalanine ammonia-lyase (RgPAL) from Rhodotorula glutinis JN-1. RgPAL was immobilized on a modified mesoporous silica support (MCM-41-NH-GA). The resulting MCM-41-NH-GA-RgPAL showed high activity and stability. The resolution efficiency using MCM-41-NH-GA-RgPAL in a recirculating packed-bed reactor (RPBR) was higher than that in a stirred-tank reactor. Under optimal operational conditions, the volumetric conversion rate of L-phenylalanine and the productivity of D-phenylalanine reached 96.7 mM h⁻¹ and 0.32 g L⁻¹ h⁻¹, respectively. The optical purity (eeD) of D-phenylalanine exceeded 99%. The RPBR ran continuously for 16 batches, the conversion ratio did not decrease. The reactor was scaled up 25-fold, and the productivity of D-phenylalanine (eeD>99%) in the scaled-up reactor reached 7.2 g L⁻¹ h⁻¹. These results suggest that the resolution process is an alternative method to produce highly pure D-phenylalanine.
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Affiliation(s)
- Longbao Zhu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
- School of Biochemical Engineering, Anhui Polytechnic University, Wuhu, Anhui, China
| | - Li Zhou
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Nan Huang
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Wenjing Cui
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Zhongmei Liu
- Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, Jiangsu, China
| | - Ke Xiao
- 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
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