Polyclonal antibody to soman-tyrosine.

Area of Science:

• Biochemistry
• Immunology
• Toxicology

Background:

• Soman, a potent nerve agent, covalently binds to tyrosine residues in various proteins.
• Understanding soman's protein interactions is crucial for assessing its toxicity and developing countermeasures.

Purpose of the Study:

• To generate a high-affinity antibody capable of specifically recognizing soman-modified tyrosine residues.
• To investigate the potential of this antibody in identifying secondary targets of soman toxicity.

Main Methods:

• Covalent modification of a pentapeptide with soman, followed by conjugation to keyhole limpet hemocyanin.
• Immunization of rabbits with the conjugate to produce polyclonal antiserum.
• Characterization of the antibody's specificity using ELISA and Western blot assays on soman-labeled proteins.

Main Results:

• The produced polyclonal antiserum specifically recognized soman-labeled human albumin and transferrin, independent of surrounding amino acid sequences.
• The antibody demonstrated high affinity, with an IC50 of 10(-11) M in competition ELISA.
• A detection limit of 0.01 μg (15 picomoles) of soman-labeled albumin was achieved on Western blots.

Conclusions:

• A high-affinity polyclonal antibody specifically recognizing soman-tyrosine adducts across different proteins has been successfully produced.
• This antibody holds potential for identifying novel, secondary targets of soman toxicity.
• The findings contribute to a better understanding of soman's mechanism of action and potential diagnostic applications.