Difference between revisions of "Part:BBa K2963039"
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The <i>racE</i> gene is derived from <i>Bacillus subtilis</i> and it encodes a racemase which can converts L-glutamate to D-glutamate. | The <i>racE</i> gene is derived from <i>Bacillus subtilis</i> 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 <i>capB*CA</i> genes and the part containing<i>racE< | + | We used this part to produce γ-PGA with different D/L monomer ratios. We assembled the <i>capB*CA</i> genes and the part containing <i>racE</i> gene (BBa_K2963032) together to construct this part using plasmid PZM1. |
===Characterization=== | ===Characterization=== | ||
Revision as of 13:17, 19 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.
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%.
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.