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Corynebacterium-glutamicum recombinant strain for increasing conversion rate of L-phenylalanine saccharic acid

A technology of Corynebacterium glutamicum and glutamic acid bar, which is applied in the field of metabolic engineering and can solve problems such as Escherichia coli restriction

Inactive Publication Date: 2015-04-29
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although Escherichia coli can ferment and produce L-phenylalanine to a very high level, Escherichia coli is limited in large-scale industrial production due to its own characteristics, especially in the production of food-grade large-scale industrial production

Method used

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  • Corynebacterium-glutamicum recombinant strain for increasing conversion rate of L-phenylalanine saccharic acid
  • Corynebacterium-glutamicum recombinant strain for increasing conversion rate of L-phenylalanine saccharic acid
  • Corynebacterium-glutamicum recombinant strain for increasing conversion rate of L-phenylalanine saccharic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Example 1 Construction and Verification of pK18mobSacB-ptsI-iolT2-ppgk-ptsI Vector

[0061] The knockout vector pK18mobSacB-ptsI-iolT2-ppgk-ptsI was constructed by two fusion PCRs.

[0062] (1) First three homologous arms: use primers 1# (sequence shown in SEQ ID NO.1) and 2# (sequence shown in SEQ ID NO.2) to amplify to C. glutamicum ATCC 13032 as a template 812bp PtsI upstream homology arm (the downstream has the complementary sequence of the iolT2-ppgK gene cluster, and the upstream primer has an EcoRI restriction site), using primers 3# (sequence shown in SEQ ID NO.3) and 4# (sequence shown in SEQ ID NO.4) with the carrier pECXK99E-iolT2-ppgK as the template amplified to the iolT2-ppgK gene cluster of 2.3Kb size (the upstream has a sequence complementary to the downstream of the PtsI upstream homology arm, the downstream band There is a sequence complementary to the upstream of the PtsI downstream homology arm); with primers 5# (sequence shown in SEQ ID NO.5) and 6...

Embodiment 2

[0067] Example 2 Construction of pK18mobSacB-aroP vector

[0068] With the C.glutamcium ATCC 13032 genome as a template, use primer 9# (sequence shown in SEQ ID NO.9) and primer 10# (sequence shown in SEQ ID NO.10) in Table 2 to amplify to 740bp The upstream homology arm aroP F of the aroP gene is amplified using primer 11# (sequence shown in SEQ ID NO.11) and primer 12# (sequence shown in SEQ ID NO.12) AroP-R-F1 / R1 854bp was deleted in the middle of the downstream homology arm aroP R of the 747bp aroP gene. The fusion PCR method was used to fuse aroP F and aroP R into 1487bp aroP F / R. After the fragment aroP F / R and plasmid pK18mobSacB were digested with EcoRI and SmaI, the aroP F / R was connected to the plasmid vector pK18mobSacB using T4 ligase, transformed into E. coli E.coli JM109, and the plasmid was extracted using restriction enzymes EcoRI and SmaI digestion verification such as image 3 As shown, lane 1 is DL 10000DNAMarker, lane 2 is pK18mobSacB-aroP digested, lane...

Embodiment 3

[0069] Example 3C. Validation of glutamicumΔptsI::iolT2-ppgKΔaroP strain

[0070] In Corynebacterium glutamicum C. glutamicum ATCC 13032, the vector pK18mobSacB-ptsI-iolT2-ppgk-ptsI gene knockout constructed by constructing the knock-in iolT2-ppgK gene cluster was transferred into the recombinant strains, and the genome was extracted as shown in Table 2 Primer 7# (sequence as shown in SEQ ID NO.7) and primer 8# (sequence as shown in SEQ ID NO.8) carry out PCR verification (knockout verification primer is inside knockout ptsI gene, Text-PtsI-F and Text-PtsI-R knockout before 800bp, no PCR product after successful knockout) See the results figure 2As shown, the 800bp PCR band amplified from lane 3 is a negative recombinant, and from lane 2, there is no PCR band, indicating that the obtained strain is a recombinant of the ptsI site knock-in gene cluster iolT2-ppgK, It shows that the obtained strain is C. glutamicumΔptsI::iolT2-ppgK. On the basis of the recombinant strain C.glu...

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Abstract

The invention discloses a corynebacterium-glutamicum recombinant strain for increasing the conversion rate of L-phenylalanine saccharic acid and belongs to the field of metabolic engineering. The recombinant strain is characterized in that genes such as aroP, aceE, ldh and pstI are deficient, iolT2-ppgk gene is integrated on the original pstI site, and simultaneously regulatory expression plasmid containing eight key enzymes in the L-Phe synthesis path is transferred. The corynebacterium-glutamicum recombinant strain disclosed by the invention has the advantages that the accumulated amount of PEP (phosphoenolpyruvate) of an L-Phe intermediate product, the yield of the L-Phe and the conversion rate of the L-Phe for saccharic acid of glucose are obviously increased, the flowing direction of a carbon source is changed to reduce or block accumulation of side products, and the means of the metabolic engineering can be applied in synthesis of other metabolites adopting PEP as a precursor.

Description

technical field [0001] The invention relates to a recombinant bacterium of Corynebacterium glutamicum with improved sugar-acid conversion rate of L-phenylalanine, which belongs to the field of metabolic engineering. Background technique [0002] L-Phenylalanine (L-Phe), also known as L-phenyl-α-alanine, is an optically active aromatic amino acid, one of the essential amino acids for the human body, and an important intermediate in medicine and food chemicals. body, has a huge market space. [0003] The production technology of L-Phe mainly includes natural protein hydrolysis method, chemical synthesis method, enzymatic method and microbial fermentation method. Among them, the natural protein hydrolysis method is difficult to be used in industrialized production due to its relatively complicated production process and unstable product quality. The chemical synthesis method is gradually eliminated due to its shortcomings such as long production route, many by-products and ra...

Claims

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Application Information

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IPC IPC(8): C12N1/21C12N15/77C12P13/22C12R1/15
CPCC12N9/0006C12N9/1022C12N9/1092C12N9/1096C12N9/1205C12N9/88C12N9/90C12P13/22C12Y101/01025C12Y202/01001C12Y205/01019C12Y206/01C12Y207/01071C12Y402/01051C12Y504/99005
Inventor 陈坚堵国成康振张传志顾汉章徐堃
Owner JIANGNAN UNIV
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