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Construction and characterization of recombinant single-chain variable fragment antibodies against Toxoplasma gondii MIC2 protein

Published online by Cambridge University Press:  27 July 2005

L.-N. HOE ,
K.-L. WAN  and
S. NATHAN
L.-N. HOE
Affiliation:
Centre for Gene Analysis and Technology, School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D. E., Malaysia
K.-L. WAN
Affiliation:
Centre for Gene Analysis and Technology, School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D. E., Malaysia
S. NATHAN
Affiliation:
Centre for Gene Analysis and Technology, School of Biosciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor D. E., Malaysia
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Abstract

The protozoan parasite Toxoplasma gondii produces a family of microneme proteins that are thought to play diverse roles in aiding the parasite's intracellular existence. Among these, TgMIC2 has a putative function in parasite adhesion to the host cell to initiate the invasion process. The invasion process may be localized and inhibited by monoclonal antibodies against the protein(s) involved. Here we report on the construction of a phage-displayed single-chain variable fragment (scFv) library from mice immunized with whole T. gondii parasites. The library was subsequently panned against recombinant TgMIC2 (rpTgMIC2) and 2 different groups of antibody clones were obtained, based on fingerprinting and sequencing data. The expressed recombinant scFv antibody was able to recognize rpTgMIC2 in a Western blot detection experiment. These results show that the phage display technology allows quick and effective production of monoclonal antibodies against parasite antigens. By panning the scFv-displayed library, we should be able to obtain a plethora of multi-functional scFv antibodies towards T. gondii proteins.

Keywords

phage displaymonoclonal antibodiesrecombinant proteintoxoplasmosis
Type
Research Article
Information
Parasitology , Volume 131 , Issue 6 , December 2005 , pp. 759 - 768
Copyright
© 2005 Cambridge University Press

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