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Antibiotic Selection00:57

Antibiotic Selection

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Bacterial Transformation01:33

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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...

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Scalable High Throughput Selection From Phage-displayed Synthetic Antibody Libraries
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Bacterial two hybrid: a versatile one-step intracellular selection method.

Mireille Pellis1, Serge Muyldermans, Cécile Vincke

  • 1Department of Molecular and Cellular Interactions, VIB, Brussels, Belgium.

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|August 14, 2012
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Phage display antibody fragments often fail as intracellular antibodies due to folding issues. Bacterial two-hybrid selection in E. coli offers a robust method to identify functional single-domain antibodies (sdAbs) for intracellular use.

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Area of Science:

  • Molecular Biology
  • Immunotechnology
  • Biotechnology

Background:

  • Antibody fragments selected ex vivo via phage display frequently exhibit poor functionality as intracellular antibodies (intrabodies) due to cellular folding challenges.
  • Intracellular expression requires antibodies to navigate the complex cellular environment, which can impede proper folding and antigen binding.
  • Traditional selection methods do not adequately address the in vivo folding requirements for intrabody applications.

Purpose of the Study:

  • To describe a protocol for identifying functional single-domain antibodies (sdAbs) for intracellular applications.
  • To optimize intracellular selection methods to overcome the limitations of ex vivo screening.
  • To leverage bacterial two-hybrid systems for efficient discovery of antigen-specific intrabodies.

Main Methods:

  • Utilizing a bacterial two-hybrid system for intracellular selection of antibody fragments.
  • Employing Escherichia coli (E. coli) as the host system, benefiting from its rapid growth and high transformation efficiency.
  • Describing a four-step protocol: plasmid construction, microbial cell transformation, fusion protein expression, and reporter activity selection.
  • Focusing on the selection of antigen-specific single-domain antibodies (sdAbs).

Main Results:

  • The bacterial two-hybrid system effectively selects for antibody fragments capable of proper folding and function within the intracellular environment.
  • E. coli host system facilitates screening of larger antibody repertoires compared to yeast-based systems.
  • The described protocol enables the identification of functional sdAbs suitable for intrabody applications.

Conclusions:

  • Bacterial two-hybrid selection is a superior method for identifying functional intracellular antibodies compared to traditional ex vivo methods.
  • E. coli offers advantages for high-throughput screening of antibody fragments for intrabody development.
  • This optimized protocol provides a reliable strategy for discovering antigen-specific sdAbs for intracellular therapeutic and research applications.