Splicing reaction of split inteins between non-natural exteins containing amino acid sequences of antibody hinge area

DOU Tonglu; CHEN Hao; CAO Jin; CHEN Junsheng; ZHU Jianwei

doi:10.11665/j.issn.1000-5048.20190515

Journal of China Pharmaceutical University > 2019 > 50(5): 606-613. > DOI: 10.11665/j.issn.1000-5048.20190515

DOU Tonglu, CHEN Hao, CAO Jin, CHEN Junsheng, ZHU Jianwei. Splicing reaction of split inteins between non-natural exteins containing amino acid sequences of antibody hinge area[J]. Journal of China Pharmaceutical University, 2019, 50(5): 606-613. DOI: 10.11665/j.issn.1000-5048.20190515

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Splicing reaction of split inteins between non-natural exteins containing amino acid sequences of antibody hinge area

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Intein is a functional protein that mediates self-cleavage from precursor protein and simultaneously connects the exteins on both sides of the intein via peptide bonds. Among all kinds of inteins, split intein has a wide range of applications in the field of antibody ligation. However, since the naturally split intein specifically recognizes the first three amino acid sequences “cysteine, phenylalanine, and asparagine”(CFN)of the extein, exogenous amino acids are inevitably introduced after the protein splicing reaction. In this study, the amino acid sequence “cysteine, aspartic acid, and lysine”(CDK)of the antibody hinge region was substituted for “CFN” as the recognition site for the intein and the split intein Npu DnaE was mutated into Npu*_GEP DnaE. The results showed that the mutant could recognize “CDK” and the intein splicing reaction could successfully take place. The factors affecting the intein splicing reaction platform, such as pH, temperature and the concentration of NaCl and DTT were investigated in this study. The results showed that the splicing reaction of the mutant performed well, which indicated its potential usefulness in bispecific antibody assembly. In conclusion, the problem of introducing foreign amino acids was alleviated, the broadness of intein substrate was further expanded, and further technical support for the application of intein to the antibody assembly was provided.
- split intein,
- extein,
- bi-specific antibody drug,
- protein splicing,
- exogenous amino acids

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Splicing reaction of split inteins between non-natural exteins containing amino acid sequences of antibody hinge area

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