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He X, Lin T, Xie Y, Li J, Ge Y, Zhang S, Fan J. Backbone cyclization of Salmonella typhimurium diaminopropionate ammonia-lyase to enhance the activity and stability. Protein Expr Purif 2024; 218:106447. [PMID: 38369031 DOI: 10.1016/j.pep.2024.106447] [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] [Received: 09/10/2023] [Revised: 01/11/2024] [Accepted: 02/15/2024] [Indexed: 02/20/2024]
Abstract
Diaminopropionate ammonia-lyase transforms D and L isomers of 2,3-diaminopropionate to pyruvate and ammonia. It catalyzes D- and l-serine less effectively. L-2,3-diaminopropionate is a precursor in the biosynthesis of oxalyl diaminopropionate as a neurotoxin in certain legume species. In this work, we cyclized the diaminopropionate ammonia-lyase from Salmonella typhimurium in vitro using the redox-responsive split intein, and identified that backbone cyclization afforded the enzyme with the improved activity, thermal stability and resistance to the exopeptidase proteolysis, different from effects of the incorporated sequence recognized by tobacco vein mottling virus protease at C-terminus. Using analyses of three fluorescent dyes including 8-anilino-1-naphthalenesulfonic acid, N-phenyl-1-naphthylamine, and thioflavin T, the same amounts of the cyclic protein displayed less fluorescence than those of the linear protein upon the heat treatment. The cyclic enzyme displayed the enhanced activity in Escherichia coli cells using the designed novel reporter. In this system, d-serine was added to the culture and transported into the cytoplasm. It was transformed by pre-overexpression of the diaminopropionate ammonia-lyase, and untransformed d-serine was oxidized by the coproduced human d-amino acid oxidase to generate hydrogen peroxide. This oxidant is monitored by the HyPer indicator. The current results presented that the cyclized enzyme could be applied as a better candidate to block the neurotoxin biosynthesis in certain plant species.
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Affiliation(s)
- Xiaomei He
- College of Biology and Pharmaceutical Engineering, West Anhui University, Lu'an, 237012, PR China
| | - Tingting Lin
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, 230036, PR China
| | - Yuying Xie
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, 230036, PR China
| | - Jinjing Li
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, 230036, PR China
| | - Yuanyuan Ge
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, 230036, PR China
| | - Shuncheng Zhang
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, 230036, PR China
| | - Jun Fan
- School of Life Science, Anhui Agricultural University, Hefei, Anhui, 230036, PR China.
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Hu J, Chen Y, Ren Y, Xiao W, Hu Y, Yu X, Fan J. Combination of the mutations for improving activity of TEV protease in inclusion bodies. Bioprocess Biosyst Eng 2021; 44:2129-2139. [PMID: 34036441 DOI: 10.1007/s00449-021-02589-5] [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: 01/22/2021] [Accepted: 05/12/2021] [Indexed: 11/28/2022]
Abstract
Tobacco etch virus protease (TEVp) is an enzymatic reagent to remove fusion tag, but additional purification steps are required for removing the TEVp after cleavage reaction is finished. Use of carrier-free and dependent TEVp immobilizates can eliminate protease contamination. In this work, we identified that, among the four constructed missense variants, the insoluble variant with the highest activity was correspondent with the soluble one tested formerly. The activities of the insoluble 15 codon variants were assayed and the variant with highest activity was selected. The K45F and/or E106G mutations have been reported on slightly improving protein stability of the wild-type TEVp, but only E106G mutation enhanced soluble production and activity of the selected TEVp variant, and it increased soluble amounts of two codon variants with the impaired folding. The decreased activity and use efficiency of the optimized TEVp variant in inclusion bodies was balanced by the determined high level production, lower leaking amounts of the protein, the enhanced resistance to the limited proteolysis mediated by protease K and trypsin, and the increased inhibition of auto-cleavage, as comparison to those of the immobilized soluble one. Thus, the TEVp construct is a potential alternate for simplifying protein purification protocols after tag-removal.
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Affiliation(s)
- Jiong Hu
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China
| | - Yinghua Chen
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China
| | - Yuanyuan Ren
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China
| | - Wenjun Xiao
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China
| | - Yafang Hu
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China
| | - Xuelian Yu
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China
| | - Jun Fan
- School of Life Science, Anhui Agricultural University, 130, Changjiang West Road, Hefei, 230036, Anhui Province, People's Republic of China.
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Evaluation of rice tetraticopeptide domain-containing thioredoxin as a novel solubility-enhancing fusion tag in Escherichia coli. J Biosci Bioeng 2018; 125:160-167. [DOI: 10.1016/j.jbiosc.2017.08.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 08/18/2017] [Accepted: 08/24/2017] [Indexed: 02/06/2023]
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Yu X, Sun J, Wang W, Jiang L, Wang R, Xiao W, Cheng B, Fan J. Tobacco etch virus protease mediating cleavage of the cellulose-binding module tagged colored proteins immobilized on the regenerated amorphous cellulose. Bioprocess Biosyst Eng 2017; 40:1101-1110. [DOI: 10.1007/s00449-017-1772-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2016] [Accepted: 04/17/2017] [Indexed: 12/12/2022]
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Assessment of the Fusion Tags on Increasing Soluble Production of the Active TEV Protease Variant and Other Target Proteins in E. coli. Appl Biochem Biotechnol 2016; 182:769-781. [DOI: 10.1007/s12010-016-2360-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 12/05/2016] [Indexed: 10/20/2022]
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Casteleijn MG, Urtti A, Sarkhel S. Expression without boundaries: Cell-free protein synthesis in pharmaceutical research. Int J Pharm 2013; 440:39-47. [DOI: 10.1016/j.ijpharm.2012.04.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Revised: 04/01/2012] [Accepted: 04/03/2012] [Indexed: 11/15/2022]
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Exploiting the interactions between poly-histidine fusion tags and immobilized metal ions. Biotechnol Lett 2011; 33:1075-84. [PMID: 21318632 DOI: 10.1007/s10529-011-0554-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2010] [Accepted: 01/24/2011] [Indexed: 10/18/2022]
Abstract
Immobilized metal affinity chromatography (IMAC) of proteins containing poly-histidine fusion tags is an efficient research tool for purifying recombinant proteins from crude cellular feedstocks at laboratory scale. Nevertheless, to achieve successful purification of large amounts of the target protein for critical therapeutic applications that demand the precise removal of fusion tags, it is important to also take into consideration issues such as protein quality, efficiency, cost effectiveness, and optimal affinity tag choice and design. Despite the many considerations described in this article, it is expected that enhanced selectivity, the primary consideration in the field of protein separation, will continue to see the use of IMAC in solving new purification challenges. In addition, the platform nature of this technology makes it an ideal choice in purifying proteins with unknown properties. Finally, the unique interaction between immobilized metal ions and poly-histidine fusion tag has enabled new developments in the areas of biosensor, immunoassay, and other analytical technologies.
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Shahravan SH, Qu X, Chan IS, Shin JA. Enhancing the specificity of the enterokinase cleavage reaction to promote efficient cleavage of a fusion tag. Protein Expr Purif 2008; 59:314-9. [PMID: 18406169 DOI: 10.1016/j.pep.2008.02.015] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2008] [Revised: 02/21/2008] [Accepted: 02/27/2008] [Indexed: 10/22/2022]
Abstract
In our work with designed minimalist proteins based on the bZIP motif, we have found our His-tagged proteins to be prone to inclusion body formation and aggregation; we suspect this problem is largely due to the His tag, known to promote aggregation. Using AhR6-C/EBP, a hybrid of the AhR basic region and C/EBP leucine zipper, as representative of our bZIP-like protein family, we attempted removal of the His tag with enterokinase (EK) but obtained the desired cleavage product in very small yield. EK is known for proteolysis at noncanonical sites, and most cleavage occurred at unintended sites. We manipulated experimental conditions to improve specificity of proteolysis and analyzed the cleavage products; no effect was observed after changing pH, temperature, or the amount of EK. We then suspected the accessibility of the EK site was impeded due to protein aggregation. We found that the easily implemented strategy of addition of urea (1-4 M) greatly improved EK cleavage specificity at the canonical site and reduced adventitious cleavage. We believe that this enhancement in specificity is due to a more "open" protein structure, in which the now accessible canonical target can compete effectively with adventitious cleavage sites of related sequence.
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Affiliation(s)
- S Hesam Shahravan
- Department of Chemistry, University of Toronto, Mississauga, Ont., Canada L5L 1C6
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