Gene-engineering bacterium, construction method of same, and method of producing vanillin
A technology of genetically engineered bacteria and construction methods, applied in the direction of microorganism-based methods, biochemical equipment and methods, enzymes, etc., can solve the problems of many foreign genes, long routes, and cumbersome steps
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Embodiment 1
[0056] Example 1: Knockout of shikimate dehydrogenase encoding gene aroE in Escherichia coli BL21(DE3)
[0057] The shikimate dehydrogenase encoding gene aroE in Escherichia coli BL21(DE3) was knocked out by PCR Targeting technology, and the obtained strain was named WYV5. The specific operation is as follows:
[0058] Using the BL21(DE3) strain genome as a template, the primer pairs aroE_up_s, aroE_up_a and aroE_dw_s, aroE_dw_a were used to amplify the upstream and downstream homology arms of the aroE gene, and pKD3 was used as a template to amplify the chloride The mycin resistance gene fragment, the three fragments were amplified by overlapping PCR to obtain the aroE gene knockout fragment aroE::cm, the primer sequences are as follows:
[0059] aroE_up_s: 5'-AACGGAAGCCGTTTTCGGTG-3';
[0060] aroE_up_a: 5'-CATTATGTTACCCCTGTCGA-3';
[0061] aroE-cm_s: 5′-AATCCGCGATGCCCTGACGGGTGAACTGTTTCGACAGGGGTAACATAATGGTGTAGGCTGGAGCTGCTTC-3′;
[0062] aroE-cm_a: 5′-ATTCTCGTCCCACTCTTCCCT...
Embodiment 2
[0073] Example 2: Knockout of a possible vanillin-degrading gene cluster yqhC-yqhD-dkgA
[0074] Using PCR Targeting technology, the possible vanillin degradation gene cluster yqhC-yqhD-dkgA was knocked out of the strain obtained in Example 1, and the obtained strain was named WYV18. The specific operation is as follows:
[0075] Using the BL21(DE3) strain genome as a template, the primer pairs yqhC-dkgA_up_s, yqhC-dkgA_up_a and yqhC-dkgA_dw_s, yqhC-dkgA_dw_a were used to amplify the upstream and downstream homology arms of the yqhC-yqhD-dkgA gene cluster, and pKD3 was used as a template, Amplify the chloramphenicol resistance gene fragment with primer pair yqhC-dkgA-cm_s, yqhC-dkgA-cm_a, three fragments are obtained yqhC-yqhD-dkgA gene cluster knockout fragment yqhC-yqhD-dkgA by overlapping PCR amplification: :cm. The primer sequences are as follows:
[0076] yqhC-dkgA_up_s: 5'-TTTTCTGCCTACGATTGC-3';
[0077] yqhC-dkgA_up_a: 5'-GGAAAATCGTCAGGCGTTAC-3';
[0078] yqhC-dkgA...
Embodiment 3
[0089] Example 3: Knockout of a possible vanillin degradation gene yahK
[0090] Using the PCR Targeting technique, the possible vanillin degradation gene yahK was knocked out of the strain WYV18 obtained in Example 2, and the obtained strain was named WYV39. The specific operation is as follows:
[0091] Using the BL21(DE3) strain genome as a template, the primer pair yahK_up_s, yahK_up_a and yahK_dw_s, yahK_dw_a were used to amplify the upstream and downstream homology arms of the yahK gene, and pKD3 was used as a template to amplify the chloride Mycin resistance gene fragments, the three fragments were amplified by overlapping PCR to obtain the yahK gene knockout fragment yahK::cm, the primer sequences are as follows:
[0092] yahK_up_s: 5'-AGATGAACTGGCGAACCGGA-3';
[0093] yahK_up_a: 5′-GAACTTCGAAGCAGCTCCAGCCTACACCATTGTGTTTACTCCTGATTAGC-3′;
[0094] yahk-cm_s: 5′-GCTAATCAGGAGTAAACACAATGGTGTAGGCTGGAGCTGCTTCGAAGTTC-3′;
[0095] yahK-cm_a: 5'-TGTTAAACCACAGGGTATTTTATTAATTT...
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