nε-(1-methylcycloprop-2-enamide)-lysine translation system and its application
A translation system and methyl ring technology, applied in enzymes, cells modified by introducing foreign genetic material, biochemical equipment and methods, etc., can solve problems affecting the conformation of proteins themselves
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Embodiment 1
[0045] Embodiment 1: chemical synthesis
[0046] 1. N ε The chemical synthesis of -(1-methylcycloprop-2-enamide)-lysine (CpK)( figure 1 )
[0047] For the chemical synthesis route of CpK see figure 1 . Concrete synthesis reaction steps are as follows:
[0048] Into a 1000 mL round bottom flask equipped with a magnetic stirrer and a thermometer were added sodium azide (6.5 g, 100 mmol), 2M sodium hydroxide solution (200 mL, 40 mmol), tetrabutylammonium bromide (TBAB) (80 mg, 0.25 mmol ) and 100 mL of hexane (100 mL), stirred vigorously on an ice bath at 0°C. After complete dissolution, trifluoromethanesulfonic anhydride (8.2 mL, 50 mmol) was slowly added dropwise with a syringe, and reacted for 10 minutes. Another ethyl 2-methylacetoacetate (3.53mL, 25mmol) was dissolved in 100mL of acetonitrile, then the ethyl 2-methylacetoacetate solution was added to the reaction flask through a funnel, and then 10mL of acetonitrile was added, and the initial no The colored reaction s...
Embodiment 2
[0063] Example 2: Evolution of CpK-specific aminoacyl-tRNA synthetases
[0064] For site-specific insertion of CpKs in the gene, it is necessary to introduce an aminoacyl-tRNA synthetase / tRNA orthogonal pair in the E. coli host cell used, which is derived from the amber of Methanosarcinabarkeri Inhibition of lysyl tRNA (MbtRNA CUA Pyl ) / lysyl tRNA synthetase (MbPylRS, wild type, its amino acid sequence is SEQ ID NO: 2) pair.
[0065] The MbPylRS mutation library was constructed in the kanamycin-resistant pBK plasmid (purchased from the laboratory of Peter G. Schultz, Scripps Research Institute, USA), and located between the promoter and terminator of E. coli glutamine synthetase on the plasmid. The synthetic enzyme mutation library used is the pBk-CpK library, and the construction method of the mutation library is as follows: select 5 sites (L266, L270, Y271, L274 and C313) on the MbPylRS gene, and perform random mutation by PCR. Positive and negative screens were then perf...
Embodiment 3
[0067] Example 3: Expressing CpK-myoglobin and performing an in vitro photoclick reaction
[0068] The orthogonal tRNA (SEQ ID NO: 1) and the nucleotide sequence (4TAG) (SEQ ID NO: 5) encoding myoglobin were constructed on the pBAD vector (purchased from PeterG. The nucleotide sequence of CpKRS (SEQ ID NO: 3) was constructed on the pBK vector (purchased from Peter G. Schultz Laboratory of Scripps Research Institute, USA), and then co-transformed into DH10B cells (purchased from Quanshijin Company). Pick a single clone and grow to OD at 37°C 600 When it was approximately equal to 0.5, 1 mM CpK and 0.2% arabinose (purchased from sigma company) were added to the LB medium to culture the cells, and no CpK was added to the control. After 6-7 hours, the bacteria were harvested, and the protein was purified by Ni-NTA, and analyzed by SDS-PAGE electrophoresis ( Figure 4 a).
[0069] We found that the full-length myoglobin can only be purified in the medium with CpK, which indicate...
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