CN111518792A - Beta-glucosidase mutant TLE of penicillium oxalicum 16 and application thereof - Google Patents

Beta-glucosidase mutant TLE of penicillium oxalicum 16 and application thereof Download PDF

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CN111518792A
CN111518792A CN202010456548.2A CN202010456548A CN111518792A CN 111518792 A CN111518792 A CN 111518792A CN 202010456548 A CN202010456548 A CN 202010456548A CN 111518792 A CN111518792 A CN 111518792A
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赵喜华
王可心
黄秋霞
李汉昕
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Abstract

The invention relates to β -glucosidase mutant TLE of penicillium oxalicum 16 and application thereof, wherein the amino acid sequence of β -glucosidase mutant TLE is SEQ ID NO. 3, and the nucleic acid sequence of the coding gene is SEQ ID NO. 4, β -glucosideThe optimal reaction temperature of the enzyme mutant TLE is 65 ℃, and the catalytic efficiency constant isk cat/K m983.68mM are achieved‑1S‑1Glucose inhibitory StrengthK appm/K IThe value is 0.35 (when 20mmol/L glucose), which is 1.22 times and 0.3 times of the original enzyme respectively, the glucose tolerance is improved by 263%, higher product tolerance and higher activity are shown, and the β -glucosidase mutant TLE can be applied to the fields of feed, medicine, food, chemical industry, energy and the like.

Description

Beta-glucosidase mutant TLE of penicillium oxalicum 16 and application thereof
Technical Field
The invention relates to a beta-glucosidase mutant TLE of penicillium oxalicum 16 and application thereof, and particularly belongs to the technical field of enzyme engineering.
Background
Beta-glucosidase can hydrolyze a substrate into beta-D-glucose and corresponding aglycone, but because the original beta-glucosidase has poor enzymological characteristics, such as low catalytic activity, poor glucose tolerance and high catalytic temperature, the beta-glucosidase is difficult to be applied to a plurality of fields of feed, medicine, food, chemical industry, energy and the like.
The beta-glucosidase of penicillium oxalicum 16 has an uninhibited activity against furan derivatives and phenolic compounds and an excellent tolerance against high concentrations of KCl, NaCl and ethanol, however, the optimum temperature of wild type 16BGL is about 70 ℃, and its activity and glucose tolerance are low. The mutant TLE is obtained through a molecular modification technology, has high catalytic efficiency and high glucose tolerance, can meet the requirements of various fields such as feed, medicine, food, chemical industry, energy and the like, and has good application prospect.
Disclosure of Invention
The invention aims to provide a beta-glucosidase mutant TLE of penicillium oxalicum 16 and application thereof. According to the invention, through high-throughput screening, a mutant TLE with higher glucose tolerance and higher activity at a lower temperature is finally obtained, and the constitutive expression Pichia pastoris GS115 engineering bacteria is reconstructed, so that a foundation is laid for realizing the application of the engineering bacteria.
The amino acid sequence of the beta-glucosidase mutant TLE of penicillium oxalicum 16 is SEQ ID NO: 3, the nucleic acid sequence of the coding gene is SEQ ID NO: 4; the beta-glucosidase of the penicillium oxalicum 16 is SEQ ID NO: 1, wherein the 280 th methionine of the amino acid sequence is mutated into threonine, the 484 th valine is mutated into leucine, and the 589 th aspartic acid is mutated into glutamic acid.
The coding gene is inserted into a vector pGAPZaA at the Not I and EcoRI insertion sites to obtain a recombinant vector pGAPZaA-TLE.
After the recombinant vector pGAPZaA-TLE is linearized by Bgl II restriction endonuclease, the recombinant vector is electrically transferred to pichia pastoris GS115 to obtain the recombinant pichia pastoris GS115 engineering bacteria.
The recombinant pichia pastoris GS115 engineering bacteria are used for producing a beta-glucosidase mutant TLE.
The beta-glucosidase mutant TLE is applied under the conditions that the reaction temperature is 30-70 ℃ and the pH is 3-6.
The invention has the beneficial effects that the mutant TLE is obtained through a molecular modification technology, the optimum reaction temperature of the mutant TLE is 65 ℃, and the catalytic efficiency constant k is 65 DEG, wherein the mutant TLE is &lTt transfer = &/T &gTt-glucosidase mutant TLEcat/Km983.68mM are achieved-1S-1Glucose inhibitory Strength Kappm/KIThe value is 0.35 (when 20mmol/L glucose), which is 1.22 times and 0.3 time of the original enzyme respectively, the glucose tolerance of the enzyme is improved by 263 percent, higher catalytic efficiency and high glucose tolerance are shown, and the enzyme can be applied to the fields of feed, medicine, food, chemical industry, energy and the like, and has good application prospect.
Drawings
FIG. 1 is a graph showing the relative activities of the original enzyme and the mutant TLE at different temperatures in example 4 of the present invention;
FIG. 2 is a graph showing the cellulosic ethanol yields of the original enzyme, control and mutant TLEs of example 5 of the present invention;
in the figure: the control was no addition of any beta-glucosidase.
Detailed Description
The present invention will be further described with reference to the drawings and examples so that those skilled in the art can understand the present invention, but the present invention is not limited to the following embodiments.
Example 1
Obtaining beta-glucosidase
This example used Trizol test by TarkaraThe agent and the reverse transcription kit take penicillium oxalicum 16 as a material, and carry out inoculation, induction culture and mycelium collection on the penicillium oxalicum 16. Total RNA is extracted by a Trizol method, and then reverse transcription is carried out to obtain cDNA. By using a conventional PCR method, through a specific primer SP 5-GAATTCAAGGATCTTGCCTACTCTCCCCCCT-3 '(underlined is EcoR I restriction enzyme cleavage site) and XM 5'GGCGGCCGCCTCAATGGTGATGGTGATGATGCTGCACCTTGGGCAGATCGGCTGAAAG-3' (the straight line is Not I restriction enzyme cutting site, the wavy line is 6 histidine labels), amplifying β -glucosidase gene by taking cDNA as a template, connecting to a constitutive expression vector pGAPZaA to obtain a recombinant vector, and sequencing the recombinant vector to obtain the nucleotide sequence of the recombinant vector shown as SEQ ID NO. 2 and the coded amino acid sequence shown as SEQ ID NO. 1.
Example 2
Discovery of beta-glucosidase mutant gene
And (3) performing directed evolution technology on the nucleotide sequence of SEQ ID NO: 2, carrying out molecular modification to obtain a mutant gene, connecting the mutant gene with a constitutive expression vector pGAPZaA to obtain a recombinant vector, carrying out panel color screening and 96-well plate high-throughput screening to obtain a mutant TLE with higher activity and high glucose tolerance, and sequencing the mutant TLE to obtain a nucleotide sequence of the mutant TLE, wherein the nucleotide sequence is shown as SEQ ID NO: 4, and the coded amino acid sequence is shown as SEQ ID NO: 3, respectively.
Experimental example 3
Preparation of beta-glucosidase mutant TLE
The directed evolution conditions were 3. mu.L of 10 × PCR buffer, 3. mu.L of dNTP, and 0.5mmol/L of MnCl20.3 μ M of the upstream primer SP, 0.3 μ M of the downstream primer XM, 5U of Taq DNA polymerase, 5ng of β -glucosidase DNA template, sterile deionized water to 30 μ L.
The mutant genes from directed evolution were ligated into the vector pGAPZ. alpha.A, then transformed into E.coli Top10 and plated on LB plates containing bleomycin, and all positive mutants from LB plates were recovered into 250mL Erlenmeyer flasks containing 25mLLB (pH 7.5) containing 50. mu.g/mL bleomycin at 37 ℃ for 4-6h at 120 rpm. Extracting a recombinant vector of the escherichia coli Top10, carrying out enzyme digestion, electrically transferring the recombinant vector after enzyme digestion into pichia pastoris GS115, then coating a transformant into a YPG (pH6.5) plate containing 5g of glucose, 0.15% of esculin, 1.5% of ferric ammonium citrate and 100ug/mL of bleomycin, and culturing at 30 ℃ for 48-96 h.
All positive mutants with large black circles around them were screened from the first round of screening for the second round of screening. The selected positive mutants were inoculated into 96-well plates containing 100. mu.L LYPG liquid medium and 100. mu.g/mL bleomycin, and cultured at 30 ℃ for 48 hours. The bacterial liquid was centrifuged at 10000rpm for 5 minutes, and the supernatant and the precipitate were separately stored. mu.L of the diluted supernatant was mixed with 25. mu.L of 1% salicin (dissolved in 50mM citrate buffer, pH5) in a 96-well plate at 50 ℃ for 15 minutes. Then, 50 μ l of dns was added to the mixture to terminate the reaction. The reaction mixture was boiled for another 10 minutes and then cooled at room temperature. Finally, the OD of the mixture at 540nm was determined using a microplate reader.
Positive mutants with higher OD values were selected from the second round of selection for further screening, inoculated into liquid medium containing 25mLYPG (pH6.5) and cultured at 30 ℃ for 2 days, containing 100. mu.g/mL of bleomycin. Then, the bacterial solution was centrifuged at 10000g for 15 minutes to obtain a supernatant. According to the DNS method, a mutant TLE with higher activity and high glucose tolerance is obtained.
Example 4
Characterization of the enzymatic Properties of the beta-glucosidase and its mutant TLE
And (3) measuring enzyme activity: taking 50 μ L of enzyme solution after appropriate dilution, adding 450 μ L of 1% salicin (salicin is dissolved in 50mM citrate buffer solution with pH5.0 in advance), mixing well, reacting at 50 deg.C for a while, finally adding 500 μ L of DNS reagent to terminate the reaction, boiling the reactant in boiling water for 10-15min, cooling to room temperature, and detecting OD value at 540nm with spectrophotometer.
Measurement of optimum temperature: the β -glucosidase and its mutant TLE were reacted with 50mM acetate buffer containing salicin, pH5 at various temperatures (35-80 ℃ for 30 minutes), respectively, and its activity was measured by DNS method.
Glucose tolerance was determined by taking 25. mu.L of diluted 16BGL or its mutant and different concentrations of 4-nitrophenyl- β -D-glucoside (pNPG) and glucose, mixing, adding citric acid buffer at pH5.0 to a total volume of 500. mu.L, after reacting for 15 minutes at 50 ℃, adding an equal volume of 10% (w/V) sodium carbonate to the mixture to terminate the reaction and obtain the OD of the mixture at 420nm, wherein the final concentrations of pNPG were 0.1, 0.2, 0.4, 0.6, 0.8 and 1mmol/L, respectively, and the final concentrations of glucose were controlled to 0, 20 and 40mmol/L, respectively, according to the Lineweaver-Burk reciprocal diagram, V was calculated using Michaelis-Menten equation (1) and competitive inhibition equation (2)max，KmAnd KI(glucose inhibition constant).
Figure BDA0002509432930000041
Figure BDA0002509432930000042
As can be seen from Table 1 and FIG. 1, the catalytic efficiency constant k of the mutant TLEcat/Km983.68mM are achieved-1S-1Glucose inhibitory Strength Kappm/KIThe value of 0.35 (at 20mmol/L glucose) is 1.22 times and 0.3 times that of the original enzyme (glucose tolerance of this mutant is improved by 263%), representing higher product tolerance and activity.
TABLE 1 molecular dynamics constants and glucose-inhibited molecular dynamics constants
Figure BDA0002509432930000043
Example 5
Application of beta-glucosidase mutant TLE in production of cellulosic ethanol
Taking a 250mL conical flask, shaking, adding 10g of microcrystalline cellulose as a substrate, 20IU of filter paper enzyme solution, 0.06mg of beta-glucosidase or mutant TLE thereof and an equal amount of saccharomyces cerevisiae UV-20 fermented for 48 hours, and then fixing the volume to 100 mL. The control was not added with any β -glucosidase, and the rest was unchanged.
And (3) performing static culture in an incubator at 40 ℃, taking 1mL of bacterial liquid every 12h, centrifuging, taking supernatant, and detecting the alcohol concentration by using a potassium dichromate method.
As shown in FIG. 2, after 120 hours of fermentation, the mutant TLE produced 6.15g/L of cellulosic ethanol, which was 9.52% and 21.78% higher than the β -glucosidase and control of Penicillium oxalicum 16, respectively. Therefore, the mutant TLE has potential application value in cellulosic ethanol production.
Sequence listing
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<120>1, beta-glucosidase mutant TLE of penicillium oxalicum 16 and application
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Asn Glu Asn Ile Thr Ala Ile Leu Trp Ala Gly Met Pro Gly Gln Glu
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Pro Leu Leu Thr Lys Pro Asn Asn Gly His Gly Ala Pro Gln Asp Asp
595 600 605
Phe Thr Asp Val Leu Ile Asp Tyr Arg Arg Phe Asp Lys Asp Asn Val
610 615 620
Glu Pro Ile Phe Glu Phe Gly Phe Gly Leu Ser Tyr Thr Lys Phe Glu
625 630 635 640
Phe Ser Asp Ile Gln Val Lys Ala Leu Asn His Gly Glu Tyr Asn Ala
645 650 655
Thr Val Gly Lys Thr Lys Pro Ala Pro Ser Leu Gly Lys Pro Gly Asn
660 665 670
Ala Ser Asp His Leu Phe Pro Ser Asn Ile Asn Arg Val Arg Gln Tyr
675 680 685
Leu Tyr Pro Tyr Leu Asn Ser Thr Asp Leu Lys Ala Ser Ala Asn Asp
690 695 700
Pro Asp Tyr Gly Met Asn Ala Ser Ala Tyr Ile Pro Pro His Ala Thr
705 710 715 720
Asp Ser Asp Pro Gln Asp Leu Leu Pro Ala Ser Gly Pro Ser Gly Gly
725 730 735
Asn Pro Gly Leu Phe Glu Asp Leu Ile Glu Val Thr Ala Thr Val Thr
740 745 750
Asn Thr Gly Ser Val Thr Gly Asp Glu Val Pro Gln Leu Tyr Val Ser
755 760 765
Leu Gly Gly Ala Asp Asp Pro Val Lys Val Leu Arg Ala Phe Asp Arg
770 775 780
Val Thr Ile Ala Pro Gly Gln Lys Leu Arg Trp Thr Ala Thr Leu Asn
785 790 795 800
Arg Arg Asp Leu Ser Asn Trp Asp Val Pro Ser Gln Asn Trp Ile Ile
805 810 815
Ser Asp Ala Pro Lys Lys Val Trp Val Gly Asn Ser Ser Arg Lys Leu
820 825 830
Pro Leu Ser Ala Asp Leu Pro Lys Val Gln
835 840
<210>4
<211>2526
<212>DNA
<213>Mutant gene
<400>4

Claims (5)

1. A beta-glucosidase mutant TLE of penicillium oxalicum 16, characterized in that: the amino acid sequence of the beta-glucosidase mutant TLE is SEQ ID NO: 3, the nucleic acid sequence of the coding gene is SEQ ID NO: 4; the beta-glucosidase of the penicillium oxalicum 16 is SEQ ID NO: 1, wherein the 280 th methionine of the amino acid sequence is mutated into threonine, the 484 th valine is mutated into leucine, and the 589 th aspartic acid is mutated into glutamic acid.
2. The beta-glucosidase mutant TLE of penicillium oxalicum 16 according to claim 1, characterized in that: the coding gene is inserted into a vector pGAPZaA at the Not I and EcoR I insertion sites to obtain a recombinant vector pGAPZaA-TLE.
3. The beta-glucosidase mutant TLE of penicillium oxalicum 16 according to claim 2, characterized in that: after the recombinant vector pGAPZaA-TLE is linearized by Bgl II restriction endonuclease, the recombinant vector is electrically transferred to pichia pastoris GS115 to obtain the recombinant pichia pastoris GS115 engineering bacteria.
4. The beta-glucosidase mutant TLE of penicillium oxalicum 16 according to claim 3, wherein: the recombinant pichia pastoris GS115 engineering bacteria are used for producing a beta-glucosidase mutant TLE.
5. The application of a beta-glucosidase mutant TLE of penicillium oxalicum 16 is characterized in that: the beta-glucosidase mutant TLE is applied under the conditions that the reaction temperature is 30-70 ℃ and the pH is 3-6.
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WO2023225459A2 (en) 2022-05-14 2023-11-23 Novozymes A/S Compositions and methods for preventing, treating, supressing and/or eliminating phytopathogenic infestations and infections
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WO2022062501A1 (en) * 2020-09-24 2022-03-31 江南大学 Method for preparing gentiooligosaccharide by catalyzing cellulose by using compound enzyme, and use thereof
CN114703165A (en) * 2022-04-02 2022-07-05 天津科技大学 Beta-glucosidase mutant and application thereof
WO2023225459A2 (en) 2022-05-14 2023-11-23 Novozymes A/S Compositions and methods for preventing, treating, supressing and/or eliminating phytopathogenic infestations and infections
CN118147115A (en) * 2024-05-10 2024-06-07 江西师范大学 Beta-glucosidase mutant V3-4-H6 of penicillium oxalicum 16 and application thereof
CN118147115B (en) * 2024-05-10 2024-07-30 江西师范大学 Beta-glucosidase mutant V3-4-H6 of penicillium oxalicum 16 and application thereof

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