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Antibody scFv fragments without disulfide bonds made by molecular evolution
1Biochemisches Institut, Universität Zürich, Switzerland.
Journal of Molecular Biology
|February 19, 1998
Summary
Researchers created stable, functional antibody fragments (scFv) without disulfide bonds. These cysteine-free scFv proteins can be produced in E. coli cytoplasm, offering new possibilities for intrabody development.
Area of Science:
- Biotechnology
- Molecular Biology
- Immunology
Background:
- Antibody single-chain fragments (scFv) are crucial tools in biotechnology.
- Conserved disulfide bonds are typically essential for the stability of scFv.
- Developing cysteine-free scFv could simplify production and expand applications.
Purpose of the Study:
- To generate stable and functional cysteine-free antibody single-chain fragments (scFv).
- To explore the utility of these engineered scFv as intrabodies and for simplified expression strategies.
Main Methods:
- Molecular evolution using DNA shuffling and phage display.
- Starting with the levan binding antibody ABPC48 scFv, naturally missing one cysteine.
- Expression and characterization of selected cysteine-free scFv mutants via equilibrium urea denaturation.
Main Results:
- Stable and functional cysteine-free scFv were successfully generated.
- Three characterized mutants exhibited thermodynamic stability comparable to the wild-type protein.
- These cysteine-free scFv can be expressed in the Escherichia coli cytoplasm.
Conclusions:
- Cysteine-free scFv are stable, functional, and can be produced in the bacterial cytoplasm.
- These engineered antibodies offer potential for intrabody applications and simplified production.
- The study provides insights into immunoglobulin fold stability and engineering.
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