Difference between revisions of "Part:BBa K2963039"

 
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We transferred this part into our chassis microorganism <i>Corynebacterium glutamicum</i> and used HPLC to detect the D/L monomer ratio of γ-PGA.The result shows as below.
 
We transferred this part into our chassis microorganism <i>Corynebacterium glutamicum</i> and used HPLC to detect the D/L monomer ratio of γ-PGA.The result shows as below.
  
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Picture 1
 
[[image:HPLC.png|400px]]
 
[[image:HPLC.png|400px]]
  
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Picture 2
 
[[image:HPLC3.png|400px]]
 
[[image:HPLC3.png|400px]]
  
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The results show that when we linked <i>capB*CA</i> genes with <i>racE</i> gene, the L-glutamate monomer ratio of γ-PGA is changing.
 
The results show that when we linked <i>capB*CA</i> genes with <i>racE</i> gene, the L-glutamate monomer ratio of γ-PGA is changing.
 
This part is working. All the results show that we have achieved the goal of producing different D/L glutamate monomer ratio of γ-PGA preliminary.
 
This part is working. All the results show that we have achieved the goal of producing different D/L glutamate monomer ratio of γ-PGA preliminary.
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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.Mutalik, Vivek K, et al. "Precise and reliable gene expression via standard transcription and translation initiation elements." Nature Methods 10.4(2013):354.
  
  

Latest revision as of 11:19, 20 October 2019


Producing γ-PGA with different D/L glutamate monomer ratio(R).


Usage and Biology

The BCA genes from Bacillus sp. encode a γ-PGA synthetase located on the cell membrane which is capable of polymerizing glutamic acid to form poly-γ-glutamic acid. In Bacillus licheniformis, the BCA are called capBCA. We used the B* gene a mutant of B gene. The racE gene is derived from Bacillus subtilis and it encodes a racemase which can converts L-glutamate to D-glutamate.

We used this part to produce γ-PGA with different D/L monomer ratios. We assembled the capB*CA genes and the part containing racE gene (BBa_K2963032) together to construct this part using plasmid PZM1.

Characterization

We transferred this part into our chassis microorganism Corynebacterium glutamicum and used HPLC to detect the D/L monomer ratio of γ-PGA.The result shows as below.

Picture 1 HPLC.png

Picture1 is the L-glutamate monomer ratio in γ-PGA we have produced using part BBa_K2963009 which do not link with racE gene and the result reaches about over 90%.


Picture 2 HPLC3.png

Picture2 is the result of BBa_K2963039. This part contains capBCA genes and racE gene which is under the control of tac promoter with one lacO. The L-glutamate monomer ratio reaches about 32%.

The results show that when we linked capB*CA genes with racE gene, the L-glutamate monomer ratio of γ-PGA is changing. This part is working. All the results show that we have achieved the goal of producing different D/L glutamate monomer ratio of γ-PGA preliminary.

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.Mutalik, Vivek K, et al. "Precise and reliable gene expression via standard transcription and translation initiation elements." Nature Methods 10.4(2013):354.