Novel short peptide tag from a bacterial toxin for versatile applications

Area of Science:

• Biochemistry
• Molecular Biology
• Immunotechnology

Background:

• Monoclonal antibodies (mAbs) and their epitopes are crucial for developing specific biological tag systems.
• Existing tag systems offer valuable tools for diverse biological applications.

Purpose of the Study:

• To introduce and characterize a novel RA-tag system for protein research.
• To evaluate the RA-tag/47RA mAb combination for protein purification and detection.

Main Methods:

• Development of a seven amino acid RA-tag (DIDLSRI).
• Utilizing a highly specific mAb (47RA) targeting the tag.
• Testing the system with recombinant proteins in various expression systems (E. coli, mammalian cells, yeast, plant).
• Assessing performance in protein purification, ELISA, Western blot, flow cytometry, and immunofluorescence staining.

Main Results:

• The RA-tag system demonstrated effective protein purification and detection.
• Successful application across multiple expression systems and analytical techniques.
• The RA-tag/47RA mAb combination exhibited high sensitivity and reliable affinity (K_D = 5.90 × 10^-8 M).

Conclusions:

• The RA-tag system is a versatile and effective tool for biological research.
• This novel tag system offers advantages in sensitivity and reliability compared to conventional tags.
• The RA-tag system has the potential to be broadly applicable in various research settings.