Difference between revisions of "Part:BBa K2963009"

 
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<partinfo>BBa_K2963009 short</partinfo>
 
<partinfo>BBa_K2963009 short</partinfo>
  
CapBCA complex, consisting of three subunits, is composed of CapB&#12289;CapC and CapA. CapB catalyzes poly-gamma-Glutamic acid synthesis&#65294;And CapC links CapB and CapA in the membrane. While CapA transports poly-gamma-Glutamic acid outside the cell.In our project, we use the CapBCA complex to biosynthesize poly-gamma-Glutamic acid.
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The gene cluster <i>capB*CA</i> encode an multi-enzyme complex which can polymorize D/L glutamic acid to synthesize γ-PGA.
 
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===Usage and Biology===
 
===Usage and Biology===
The BCA genes from Bacillus sp., encoding a polyglutamate synthetase located on the cell membrane, is capable of polymerizing glutamic acid to form poly-γ-glutamic acid. In Bacillus licheniformis, BCA are called capBCA.This part is used for producing L-glutamate-rich γ-PGA.
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The <i>BCA</i> genes from <i>Bacillus sp.</i>, encoding a polyglutamate synthetase located on the cell membrane, is capable of polymerizing glutamic acid to produce γ-PGA. In <i>Bacillus licheniformis</i>, <i>BCA</i> are called <i>capBCA</i>. We used the mutant <i>B* </i>gene of <i>B</i> gene. This part is used for producing L-glutamate-rich γ-PGA.
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===Characterization===
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We used NMR to detect γ-PGA and HPLC to analyze L- glutamate ratio of γ-PGA we have produce. The results as follow show that we have successfully produced L-glutamate-rich γ-PGA.
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[[image:NMR.png|400px]]
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By the NMR detection of the fermentation product, the specific hydrogen peaks a, b, and c on the γ-amide bond on the γ-polyglutamic acid could be detected at the corresponding time points. It is indicated that the <i>capB*CA</i> genes from <i>Bacillus licheniformis</i> heterologously express in <i>Corynebacterium glutamicum</i>, and the target product γ-PGA is successfully produced.
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We used HPLC to detect the L-glutamate monomer ratio of the γ-PGA we have produced. The results show that the L-glutamic acid monomer ratio reaches more than 90%. This part is working and we have produced L-glutamate-rich γ-PGA.
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[[image:HPLC.png|400px]]
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===References===
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1. Xu P, Vansiri A, Bhan N, et al. ePathBrick: a synthetic biology platform for engineering metabolic pathways in E. coli[J]. ACS Synthetic Biology, 2012, 1(7): 256-266.
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2. Peng Yingyun. Study on the production, synthesis mechanism and antifreeze of γ-polyglutamic acid. Diss. Jiangnan University, 2015.
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3. Sung M H, Park C, Kim C J, et al. Natural and edible biopolymer poly-gamma-glutamic acid: synthesis, production, and applications [J]. Chemical Record, 2005, 5(6): 352-366.
  
 
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<span class='h3bb'>Sequence and Features</span>
 
<partinfo>BBa_K2963009 SequenceAndFeatures</partinfo>
 
  
 
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Latest revision as of 14:54, 19 October 2019


capB*CA - encoding poly-γ-glutamic acid synthetase

The gene cluster capB*CA encode an multi-enzyme complex which can polymorize D/L glutamic acid to synthesize γ-PGA.

Usage and Biology

The BCA genes from Bacillus sp., encoding a polyglutamate synthetase located on the cell membrane, is capable of polymerizing glutamic acid to produce γ-PGA. In Bacillus licheniformis, BCA are called capBCA. We used the mutant B* gene of B gene. This part is used for producing L-glutamate-rich γ-PGA.

Characterization

We used NMR to detect γ-PGA and HPLC to analyze L- glutamate ratio of γ-PGA we have produce. The results as follow show that we have successfully produced L-glutamate-rich γ-PGA.

NMR.png

By the NMR detection of the fermentation product, the specific hydrogen peaks a, b, and c on the γ-amide bond on the γ-polyglutamic acid could be detected at the corresponding time points. It is indicated that the capB*CA genes from Bacillus licheniformis heterologously express in Corynebacterium glutamicum, and the target product γ-PGA is successfully produced.


We used HPLC to detect the L-glutamate monomer ratio of the γ-PGA we have produced. The results show that the L-glutamic acid monomer ratio reaches more than 90%. This part is working and we have produced L-glutamate-rich γ-PGA.

HPLC.png

References

1. Xu P, Vansiri A, Bhan N, et al. ePathBrick: a synthetic biology platform for engineering metabolic pathways in E. coli[J]. ACS Synthetic Biology, 2012, 1(7): 256-266.

2. Peng Yingyun. Study on the production, synthesis mechanism and antifreeze of γ-polyglutamic acid. Diss. Jiangnan University, 2015.

3. Sung M H, Park C, Kim C J, et al. Natural and edible biopolymer poly-gamma-glutamic acid: synthesis, production, and applications [J]. Chemical Record, 2005, 5(6): 352-366.