Article (Scientific journals)
Development of a bispecific Nanobody anti-F17 fimbria as a potential therapeutic tool.
Dhehibi, Asma; Terrak, Mohammed; Seddik, Mabrouk-Mouldi et al.
2024In Protein Expression and Purification, 215, p. 106411
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Keywords :
Bispecific; Escherichia coli F17+; F17G; Nanobodies; Animals; Camelus; Fimbriae, Bacterial/chemistry; Fimbriae, Bacterial/metabolism; Diarrhea/metabolism; Diarrhea/microbiology; Escherichia coli/genetics; Escherichia coli/chemistry; Escherichia coli Infections/metabolism; Escherichia coli Infections/microbiology; Diarrhea; Escherichia coli; Escherichia coli Infections; Fimbriae, Bacterial; Biotechnology
Abstract :
[en] Pathogenic strains of Escherichia coli F17+ are associated with various intestinal and extra-intestinal pathologies, including diarrhea, and result in significant animal mortality. These infections rely on the expression of virulence factors, such as F17 fimbriae, for adhesion. F17 fimbriae form a protective layer on the surface of E. coli bacteria, consisting of a major structural subunit, F17A, and a minor functional subunit, F17G. Because of the evolution of bacterial resistance, conventional antibiotic treatments have limited efficacy. Therefore, there is a pressing need to develop novel therapeutic tools. In this study, we cloned and produced the F17G protein. We then immunized a camel with the purified F17G protein and constructed a VHH library consisting of 2 × 109 clones. The library was then screened against F17G protein using phage display technology. Through this process, we identified an anti-F17G nanobody that was subsequently linked, via a linker, to an anti-F17A nanobody, resulting in the creation of an effective bispecific nanobody. Comprehensive characterization of this bispecific nanobody demonstrated excellent production, specific binding capacity to both recombinant forms of the two F17 antigens and the E. coli F17+ strain, remarkable stability in camel serum, and superior resistance to pepsin protease. The successful generation of this bispecific nanobody with excellent production, specific binding capacity and stability highlights its potential as a valuable tool for fighting infections caused by pathogenic E. coli F17+ strain.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Dhehibi, Asma;  Livestock and Wildlife Laboratory (LR16IRA04), Arid Lands Institute (I.R.A), University of Gabès, Médenine, 4119, Tunisia. Electronic address: asmadhehibi@gmail.com
Terrak, Mohammed  ;  Université de Liège - ULiège > Département des sciences de la vie > Centre d'Ingénierie des Protéines (CIP)
Seddik, Mabrouk-Mouldi;  Livestock and Wildlife Laboratory (LR16IRA04), Arid Lands Institute (I.R.A), University of Gabès, Médenine, 4119, Tunisia
Hammadi, Mohamed;  Livestock and Wildlife Laboratory (LR16IRA04), Arid Lands Institute (I.R.A), University of Gabès, Médenine, 4119, Tunisia
Salhi, Imed;  Livestock and Wildlife Laboratory (LR16IRA04), Arid Lands Institute (I.R.A), University of Gabès, Médenine, 4119, Tunisia
Language :
English
Title :
Development of a bispecific Nanobody anti-F17 fimbria as a potential therapeutic tool.
Publication date :
March 2024
Journal title :
Protein Expression and Purification
ISSN :
1046-5928
eISSN :
1096-0279
Publisher :
Academic Press Inc., United States
Volume :
215
Pages :
106411
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
MHESR - Ministère de l'Enseignement Supérieur et de la Recherche Scientifique [TN]
Funding text :
This work was supported by PRF program of The Tunisian Ministry of Higher Education and Scientific Research (NanofastResponse, grant ref.: PRF2017D4P1).
Available on ORBi :
since 24 January 2024

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