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Published on: February 2, 2018
[Trans-splicing of Cys mutated coagulation factor VIII]
Fu-Xiang Zhu1, Ze-Long Liu, Jing Miao
1Life Science College of Ludong University, Yantai 264025, China. fuxiangmail@163.com
Yao Xue Xue Bao = Acta Pharmaceutica Sinica
|August 25, 2012
Summary
Introducing disulfide bonds enhances protein trans-splicing for B-domain-deleted Factor VIII (BDD-FVIII). This method improves BDD-FVIII secretion and bioactivity, paving the way for in vivo studies.
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Engineering
Background:
- Protein trans-splicing is crucial for producing functional proteins from separate gene segments.
- Modifying protein structure can influence splicing efficiency and protein stability.
Purpose of the Study:
- To investigate if inter-chain disulfide bond formation improves protein trans-splicing of B-domain-deleted Factor VIII (BDD-FVIII).
- To assess the impact of disulfide bonds on BDD-FVIII secretion and bioactivity.
Main Methods:
- Introduced cysteine point mutations in heavy and light chains of BDD-FVIII.
- Co-transfected COS-7 cells with mutated BDD-FVIII genes.
- Analyzed intracellular splicing, disulfide formation, secretion, and bioactivity using Western blotting, ELISA, and Coatest.
Main Results:
- Confirmed strengthened spliced BDD-FVIII with inter-chain disulfide bonds.
- Observed elevated secretion of spliced BDD-FVIII (128 ng/mL vs. 89 ng/mL control).
- Demonstrated significantly higher bioactivity in culture supernatant (0.94 U/mL vs. 0.62 U/mL control).
Conclusions:
- Inter-chain disulfide formation enhances protein trans-splicing efficiency for BDD-FVIII.
- This strategy improves both secretion and bioactivity of BDD-FVIII.
- Provides evidence for potential in vivo applications of disulfide bond-mediated protein splicing.
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