L-glutamate dehydrogenase mutant and application thereof
A technology for glutamate dehydrogenase and mutants, which is applied in the field of L-glutamate dehydrogenase mutants and can solve problems such as low catalytic efficiency
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Embodiment 1
[0099] Example 1 Construction of L-glutamate dehydrogenase mutant library
[0100] Table 3 shows the primer sequences designed for the construction of the mutant library for mutating the 166th, 376th, and 196th positions of SEQ ID NO.1 in the sequence listing.
[0101] table 3
[0102]
[0103] Wherein, N represents any nucleotide in A, G, C, T, M represents A or C, and K represents G or T; it is selected according to the coding nucleotide of the amino acid to be mutated into at the site , For example, NNK in the A166-forward primer can represent AAG (lysine), AAT (aspartic acid), AGG (arginine) or AGT (serine), etc. The nucleotides corresponding to specific amino acids can be found in Table 2.
[0104] The gene cgGLUDH was synthesized according to the sequence of SEQ ID NO.1 in the sequence listing. The gene synthesis company was Suzhou Jinweizhi Biotechnology Co., Ltd. (Building C3, Bio-Nano Science and Technology Park, No. 218, Xinghu Street, Suzhou Industrial Park). T...
Embodiment 2
[0110] Embodiment 2 High-throughput screening mutant library
[0111] Screen according to the following experimental steps:
[0112] The transformants were inoculated in 96-well plates and induced overnight at 30°C with IPTG. Afterwards, the bacteria were harvested, cracked with bugbusterprotein extraction reagent, and centrifuged to obtain the enzyme solution.
[0113] Prepare final concentrations of 20mM PPO and 200mM NH 4 For the reaction solution of Cl and 0.37mM NADPH, take 180 μL of the above reaction solution on a microplate plate and then add 20 μL enzyme solution, the total system is 200 μL, and read the OD in a microplate reader 340 time value. With the wild type as the reference system, positive clones were selected, sequenced and detected for their enzyme activity. The sequencing company is Sangon Bioengineering (Shanghai) Co., Ltd., No. 698, Xiangmin Road, Songjiang District, Shanghai.
[0114] The selected positive clones were cultured as follows:
[0115] ...
Embodiment 3
[0125] Example 3 Acquisition of D amino acid oxidase (DAAO) gene
[0126] According to the gene sequence of AC302 DAAO enzyme recorded in the patent US9834802B2, the DAAO enzyme gene is fully synthesized. The synthesis company is Suzhou Jinweizhi Biotechnology Co., Ltd., No. 211 Pubin Road, Yanchuang Park, Jiangbei New District, Nanjing, Jiangsu Province.
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