Thermomyces lanuginosus lipase mutant, coding genes, and applications of thermomyces lanuginosus lipase mutant
A Thermomyces sp. and lipase technology, applied in application, genetic engineering, plant genetic improvement and other directions, can solve the problems of harsh reaction conditions, lengthy process steps, expensive chiral separation reagents, etc., and achieve the improvement of parental activity. Effect
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Embodiment 1
[0022] Example 1: Construction of lipase mutation library by error-prone PCR
[0023] Using the plasmid pET28-Lip-T cloned with the gene encoding Thermomyces lanuginosus DSM 10635 lipase triple mutant Lip-T (S88T / A99N / V116D, amino acid sequence SEQ ID NO.1, nucleic acid sequence SEQ ID NO.2) as a template , Using T7promoter primers and T7terminator primers (Table 1) for error-prone PCR amplification, random introduction of mutations. PCR system includes: Mg-free 2+ 1×Taq Buffer, 0.2mM dGTP, 0.2mM dATP, 1.0mM dCTP, 1.0mM dTTP, 7mM MgCl 2 , 0.2mM MnCl 2 , T7 promoter primer and T7 terminator primer 0.2μM each, plasmid pET28-Lip-T50ng, Taq DNA polymerase 5U, water up to 100μl. PCR conditions were pre-denaturation at 94°C for 5 minutes, 30 cycles: 94°C for 30s, 55°C for 30s, 72°C for 1min, and extension at 72°C for 10min after the cycle. After the PCR was positive by 0.9% agarose gel electrophoresis analysis, 1 μl of the PCR solution was taken as a template for the next round ...
Embodiment 2
[0024] Example 2: Screening of lipase mutant library
[0025] The description of high-throughput screening technology reference (Bioorgan. Med. Chem., 1999, 7: 2183-2188) for screening of mutant libraries. The specific process is as follows:
[0026] Pick the single clones in the mutant library in Example 1 and place them on a 96-well plate, add 200 μl of LB medium (containing 50 μg / ml kanamycin) to each well, and culture at 37°C for about 3 hours until OD 600 About 0.6, add 0.1mM IPTG (isopropyl-β-D-thiogalactopyranoside), and induce at 28°C for 10h. 4000g, 4°C, centrifuge for 10min, discard the supernatant, resuspend the cells with PBS buffer (pH7.2, 10mM), add the substrate containing 2-carboxyethyl-3-cyano-5-methylhexanoic acid ethyl The reaction solution of the ester and the indicator bromothymol blue was used as a reference to the engineered bacteria cells before mutation, and the positive clones with improved activity were initially screened on a 96-well plate. The p...
Embodiment 3
[0027] Example 3: Site-directed mutagenesis of S63L and D232A
[0028] The description of site-directed mutagenesis technology reference (Current Protocols in Protein Science2011, 26.6.1-26.6.10; Anal. Biochem. 2008, 375: 376-378), the specific process is as follows:
[0029] In order to site-directly mutate Lip-T into single point mutants S63L and D232A, respectively design mutation primers S63L-F and S63L-R, D232A-F and D232A-R (Table 1), and use the plasmid pET28-Lip-T as a template , for whole plasmid amplification for site-directed mutagenesis. PCR system: 5×PSBuffer 10μl, dNTP (2.5mM each) 4μl, mutant primers S63L-F and S63L-R (or D232A-F and D232A-R) 0.5μl each, plasmid pET28-Lip-T 0.5μl, PrimeSTAR DNA polymerase 0.5μl, add water to 50μl. PCR conditions were pre-denaturation at 98°C for 2 minutes, 25 cycles: 98°C for 10s, 65°C for 10s, 72°C for 6min, and finally 72°C for 10min. After the PCR was positive by 0.9% agarose gel electrophoresis, take 20 μl of each PCR sol...
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