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Llama-Derived Single Domain Antibodies Specific for Abrus Agglutinin
Llama-Derived Single Domain Antibodies Specific for Abrus Agglutinin
- Source :
- Toxins, Volume 3, Issue 11, Pages 1405-1419, Toxins, Vol 3, Iss 11, Pp 1405-1419 (2011)
- Publication Year :
- 2011
- Publisher :
- MDPI, 2011.
-
Abstract
- Llama derived single domain antibodies (sdAb), the recombinantly expressed variable heavy domains from the unique heavy-chain only antibodies of camelids, were isolated from a library derived from llamas immunized with a commercial abrin toxoid preparation. Abrin is a potent toxin similar to ricin in structure, sequence and mechanism of action. The selected sdAb were evaluated for their ability to bind to commercial abrin as well as abrax (a recombinant abrin A-chain), purified abrin fractions, Abrus agglutinin (a protein related to abrin but with lower toxicity), ricin, and unrelated proteins. Isolated sdAb were also evaluated for their ability to refold after heat denaturation and ability to be used in sandwich assays as both capture and reporter elements. The best binders were specific for the Abrus agglutinin, showing minimal binding to purified abrin fractions or unrelated proteins. These binders had sub nM affinities and regained most of their secondary structure after heating to 95 °C. They functioned well in sandwich assays. Through gel analysis and the behavior of anti-abrin monoclonal antibodies, we determined that the commercial toxoid preparation used for the original immunizations contained a high percentage of Abrus agglutinin, explaining the selection of Abrus agglutinin binders. Used in conjunction with anti-abrin monoclonal and polyclonal antibodies, these reagents can fill a role to discriminate between the highly toxic abrin and the related, but much less toxic, Abrus agglutinin and distinguish between different crude preparations.
- Subjects :
- single domain antibody
medicine.drug_class
Health, Toxicology and Mutagenesis
lcsh:Medicine
Toxicology
Monoclonal antibody
Article
law.invention
chemistry.chemical_compound
Antigen
law
medicine
Animals
Antigens
biology
Circular Dichroism
lcsh:R
Toxoid
Single-Domain Antibodies
Molecular biology
Ricin
Single-domain antibody
chemistry
reversible refolding
Polyclonal antibodies
Recombinant DNA
biology.protein
Immunization
Abrin
Plant Lectins
Camelids, New World
Subjects
Details
- Language :
- English
- ISSN :
- 20726651
- Volume :
- 3
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Toxins
- Accession number :
- edsair.doi.dedup.....a9cf365f4dc503f15a8c41ac80619383