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Using Phage Display to Develop Ubiquitin Variant Modulators for E3 Ligases
Published on: August 27, 2021
Phage displayed scFv: pIII scaffold may fine tune binding specificity
Pooja Goswami1, Deepti Saini, Subrata Sinha
1Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India.
Hybridoma (2005)
|October 28, 2009
Summary
Antibody specificity is crucial for diagnostics and therapy. This study found that a phage-displayed antibody clone (E6) lost its specific binding to placental alkaline phosphatase (PLAP) when reformatted as a soluble scFv, suggesting scaffold influence.
Area of Science:
- Immunology
- Biochemistry
- Molecular Biology
Background:
- Antibody fine specificity is critical for accurate diagnostics and effective in vivo therapies.
- Distinguishing between closely related isozymes, such as placental alkaline phosphatase (PLAP), intestinal alkaline phosphatase (IAP), and bone alkaline phosphatase (BAP), is essential.
Purpose of the Study:
- To isolate human scFv antibodies with specificity for PLAP.
- To investigate the influence of antibody scaffolds on specificity, particularly comparing phage-displayed antibodies with soluble scFv formats.
Main Methods:
- Isolation of human single-chain variable fragment (scFv) antibodies targeting PLAP using phage display technology.
- Characterization of antibody specificity in both phage-displayed and soluble scFv forms against PLAP, IAP, and BAP.
Main Results:
- A specific antibody clone, E6, was isolated, demonstrating PLAP specificity in its phage-displayed form.
- The E6 antibody lost its specific binding to PLAP when reformatted into a soluble scFv, exhibiting partial cross-reactivity with BAP.
Conclusions:
- The phage pIII scaffold present in phage-displayed antibodies may be crucial for maintaining specific conformational structures that govern binding characteristics.
- Alterations in antibody specificity observed in soluble scFv formats may be attributed to the absence of the phage scaffold.
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