Abstract |
Tumor necrosis factor (TNF) plays an important role in chronic inflammatory disorders, such as Rheumatoid Arthritis and Crohn's disease. Recently, monoclonal Camelidae variable heavy-chain domain-only antibodies (V(H)H) were developed to antagonize the action of human TNF (hTNF). Here, we show that hTNF-V(H)H does not interfere with hTNF trimerization, but competes with hTNF for hTNF-receptor binding. Moreover, we describe posttranslational dimerization and multimerization of hTNF-V(H)H molecules in vitro catalyzed by microbial transglutaminases (MTG). The ribonuclease S- tag-peptide was shown to act as a peptidyl substrate in covalent protein cross-linking reactions catalyzed by MTG from Streptomyces mobaraensis. The S-tag sequence was C-terminally fused to the hTNF-V(H)H and the fusion protein was expressed and purified from Escherichia coli culture supernatants. hTNF-V(H)H-S-tag fusion proteins were efficiently dimerized and multimerized by MTG whereas hTNF-V(H)H was not susceptible to protein cross-linking. Cell cytotoxicity assays, using hTNF as apoptosis inducing cytokine, revealed that dimerized and multimerized hTNF-V(H)H proteins were much more active than the monomeric hTNF-V(H)H. We hypothesize that improved inhibition by dimeric and multimeric single chain hTNF-V(H)H proteins is caused by avidity effects.
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Authors | Ingo Plagmann, Athena Chalaris, Andrei A Kruglov, Sergei Nedospasov, Philip Rosenstiel, Stefan Rose-John, Jürgen Scheller |
Journal | Journal of biotechnology
(J Biotechnol)
Vol. 142
Issue 2
Pg. 170-8
(Jun 15 2009)
ISSN: 1873-4863 [Electronic] Netherlands |
PMID | 19439388
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Bacterial Proteins
- Immunoglobulin G
- Immunoglobulin Heavy Chains
- Receptors, Tumor Necrosis Factor
- Recombinant Fusion Proteins
- TNF protein, human
- Tumor Necrosis Factor-alpha
- Transglutaminases
- Etanercept
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Topics |
- Animals
- Bacterial Proteins
(genetics, metabolism)
- Cell Line
- Cytotoxicity Tests, Immunologic
- Escherichia coli
(genetics)
- Etanercept
- Humans
- Immunoglobulin G
(metabolism)
- Immunoglobulin Heavy Chains
(genetics, metabolism)
- Protein Binding
- Protein Multimerization
- Receptors, Tumor Necrosis Factor
(metabolism)
- Recombinant Fusion Proteins
(metabolism)
- Ruminants
(immunology)
- Spectrometry, Fluorescence
- Streptomyces
(enzymology)
- Transglutaminases
(metabolism)
- Tumor Necrosis Factor-alpha
(antagonists & inhibitors, immunology)
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