Epoxide hydrolase mutant and application thereof
A technology of epoxides and mutants, applied in the direction of hydrolytic enzymes, enzymes, biochemical equipment and methods, etc., can solve the problems of low substrate concentration, low activity, low yield, etc., and achieve improved E value and half-life , Stereoselectivity and stability improvement
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Embodiment 1
[0027] The gene synthesis of embodiment 1 parental epoxide hydrolase
[0028] In order to express the protein with His-tag after the gene of the parental epoxide hydrolase (GenBank: Y12804.1) is connected to the vector pET-28b, its stop codon was excised, and the codon preference of E.coli The sequence was optimized for reference, and NcoI was introduced at the start codon, thereby inserting glycine after methionine. The sequence of the newly designed epoxide hydrolase gene is shown in SEQ ID NO.1 (the amino acid sequence is shown in SEQ ID NO.2). The gene synthesis work was entrusted to Shanghai Xuguan Biotechnology Development Co., Ltd., and the gene synthesis was connected to the expression vector pET -28b.
Embodiment 2
[0029] Construction of embodiment 2 mutant library
[0030] Using the parental sequence of the nucleotide sequence shown in SEQ ID NO.1 obtained in Example 1 as a template, PCR amplification was performed with the following three pairs of nucleotide sequences as primers respectively, and the 108-position isoleucine was mutated into leucine respectively. Acid single mutant IIe108-Leu (nucleotide sequence is shown in SEQIDNO.3, amino acid sequence is shown in SEQIDNO.4), 247th threonine is mutated to lysine single mutant Thr247-Lys (nucleoside The acid sequence is shown in SEQ ID NO.5, the amino acid sequence is shown in SEQ ID NO.6) and the single mutant Asp131-Ser (the nucleotide sequence is shown in SEQ ID NO.7, and the amino acid sequence is shown in SEQ ID NO.8).
[0031] Seven pairs of oligonucleotide primers are as follows (5'-3'):
[0032] Forward primer (108IIe): GTAGGCCATGATNNKGCAGCGATCGTCC
[0033] Reverse primer (108IIe): GGACGATCGCTGCNNKATCATGGCCTAC
[0034] For...
Embodiment 3
[0045] Example 3: Screening of Mutant Library
[0046] (1) Primary screening of mutant library
[0047] Pick a single colony cultured in Example 2 and place it in a 96-well plate containing 1mL of LB culture medium, add Kan (final concentration 50μg / mL), and culture at 37°C until OD 600 When it reaches 0.6-0.8, add IPTG (final concentration 0.1mM) and induce at 28°C for 12h. Centrifuge at 9000rpm for 10min, remove the supernatant, and obtain the cells. Pick wet bacteria and resuspend with 1mL (pH8.5, 0.1M) phosphate buffer to prepare bacteria suspension. The reaction was carried out in Ep tube, in 1mL system: 900μl (pH8.5, 0.1M) Tris-HCl buffer solution, 100μL of the above bacterial suspension, final concentration of 100mM epichlorohydrin, temperature 35℃, rotation speed 1000rpm, reaction After 5 minutes, 10 μl of 6M HCl was used to terminate the reaction, and 200 μl of the reaction solution was extracted in 800 μl of ethyl acetate, centrifuged at 8000 rpm for 5 minutes, an...
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