期刊
BIOCHEMICAL JOURNAL
卷 424, 期 -, 页码 263-272出版社
PORTLAND PRESS LTD
DOI: 10.1042/BJ20090697
关键词
anti-venom; dromedary; recombinant antibody; scorpion toxin; single-domain antibody
资金
- International Foundation for Science (IFS) [F/2762-2]
- North Atlantic Treaty Organization (NATO) [SfP 981865]
- Pasteur Institute, Ministry of Health and Research and Development [Tox10]
Scorpion venom, containing highly toxic, small polypeptides that diffuse rapidly within the patient, causes serious medical problems. Nanobodies, single-domain antigen-binding fragments derived from dromedary heavy-chain antibodies, have a size that closely matches that of scorpion toxins. Therefore these nanobodies might be developed into potent immunotherapeutics to treat scorpion envenoming. Multiple nanobodies of subnanomolar affinity to AahII, the most toxic polypeptide within the Androctonus australis hector venom, were isolated from a dromedary immunized with AahII. These nanobodies neutralize the lethal effect of AahII to various extents without clear correlation with the kinetic rate constants k(on) or k(off), or the equilibrium dissociation constant, K-D. One particular nanobody, referred to as NbAahII10, which targets a unique epitope on AahII, neutralizes 7 LD50 of this toxin in mice, corresponding to a neutralizing capacity of approx. 37 000 LD50 of AahII/mg of nanobody. Such high neutralizing potency has never been reached before by any other monoclonal antibody fragment.
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