Jecho Laboratories Inc.

Frederick, MD, United States

Jecho Laboratories Inc.

Frederick, MD, United States

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Sun T.,Shanghai JiaoTong University | Li C.,Shanghai JiaoTong University | Han L.,Shanghai JiaoTong University | Jiang H.,Jecho Laboratories Inc. | And 6 more authors.
Engineering in Life Sciences | Year: 2015

We report the adaptation of the new CRISPR/Cas9 (clustered regularly interspaced short palindromic repeat/CRISPR-associated protein 9) system to disrupt the gene encoding fucosyltransferase 8 (FUT8), an α1,6-fucosyltransferase that directs fucose addition to derived antibody Fc region asparagine 297, in Chinese hamster ovary (CHO) cells. Compared to previously reported homologous recombination or zinc-finger nucleases (ZFNs) applications in CHO cells, CRISPR/Cas9 demonstrated higher targeting efficiency and easier customization. FUT8 disruptive clones (FUT8-/-) were obtained within 3 weeks at indel frequencies ranging from 9 to 25%, which could be enhanced to 52% with Lens culinaris agglutinin (LCA) selection. Based on the lectin blot method, the derived FUT8-/- clone had the ability to produce defucosylated therapeutic mAb with no detrimental effects on cell growth, viability, or product quality. The clone had the potential of industrial application for therapeutic antibodies manufacturing. We have demonstrated functionally that a gene related to product synthesis could be mutated using CRISPR/Cas9 technology, and consequently the glycan profile of expressed mAb was alternated. We believe that with its robustness and effectiveness, CRISPR/Cas9 can be widely applicable in cell line development leading to higher productivity and better quality of mAbs and other biological therapeutics. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Shi S.,Shanghai JiaoTong University | Chen H.,Shanghai JiaoTong University | Jiang H.,Jecho Laboratories Inc. | Xie Y.,Jecho Laboratories Inc. | And 10 more authors.
Applied Microbiology and Biotechnology | Year: 2016

Soluble expression of recombinant therapeutic proteins in Escherichia coli (E. coli) has been a challenging task in biopharmaceutical development. In this study, a novel self-cleavable tag Zbasic–intein has been constructed for the soluble expression and purification of a recombinant cytokine, human interleukin-15 (IL-15). We screened several solubilizing tags fused with the self-cleavable Mycobacterium tuberculosis recA mini-intein ∆I-CM and demonstrated that Zbasic tag can significantly improve the solubility of the product with correspondent to the intein activity. The fusion protein “Zbasic–∆I-CM–IL-15” was expressed with high solubility and easily enriched by the cost-effective cation-exchange chromatography. The self-cleavage of the fusion tag Zbasic–∆I-CM was then induced by a pH shift, with an activation energy of 7.48 kcal/mol. The mature IL-15 with natural N-terminus was released and further purified by hydrophobic interaction and anion-exchange chromatography. High-resolution reverse-phase high-performance liquid chromatography and mass spectrometry analysis confirmed that the product was of high purity and correct mass. With a CTLL-2 cell proliferation-based assay, the EC50 was evaluated to be of about 0.126 ng/mL, similar to the product in clinical trials. By avoiding the time-consuming denaturing-refolding steps in previously reported processes, the current method is efficient and cost-effective. The novel tag Zbasic–∆I-CM can be potentially applied to large-scale manufacturing of recombinant human cytokines as well as other mammalian-sourced proteins in E. coli. © 2016 Springer-Verlag Berlin Heidelberg


PubMed | Jecho Laboratories Inc. and Shanghai JiaoTong University
Type: Journal Article | Journal: Applied microbiology and biotechnology | Year: 2016

Soluble expression of recombinant therapeutic proteins in Escherichia coli (E. coli) has been a challenging task in biopharmaceutical development. In this study, a novel self-cleavable tag Zbasic-intein has been constructed for the soluble expression and purification of a recombinant cytokine, human interleukin-15 (IL-15). We screened several solubilizing tags fused with the self-cleavable Mycobacterium tuberculosis recA mini-intein I-CM and demonstrated that Zbasic tag can significantly improve the solubility of the product with correspondent to the intein activity. The fusion protein Zbasic-I-CM-IL-15 was expressed with high solubility and easily enriched by the cost-effective cation-exchange chromatography. The self-cleavage of the fusion tag Zbasic-I-CM was then induced by a pH shift, with an activation energy of 7.48kcal/mol. The mature IL-15 with natural N-terminus was released and further purified by hydrophobic interaction and anion-exchange chromatography. High-resolution reverse-phase high-performance liquid chromatography and mass spectrometry analysis confirmed that the product was of high purity and correct mass. With a CTLL-2 cell proliferation-based assay, the EC

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