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De Meyer T, Laukens B, Nolf J, Van Lerberge E, De Rycke R, De Beuckelaer A, De Buck S, Callewaert N, Depicker A. Comparison of VHH-Fc antibody production in Arabidopsis thaliana, Nicotiana benthamiana and Pichia pastoris. PLANT BIOTECHNOLOGY JOURNAL 2015; 13:938-47. [PMID: 25641071 DOI: 10.1111/pbi.12330] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 11/27/2014] [Accepted: 12/12/2014] [Indexed: 06/04/2023]
Abstract
VHHs or nanobodies are widely acknowledged as interesting diagnostic and therapeutic tools. However, for some applications, multivalent antibody formats, such as the dimeric VHH-Fc format, are desired to increase the functional affinity. The scope of this study was to compare transient expression of diagnostic VHH-Fc antibodies in Nicotiana benthamiana leaves with their stable expression in Arabidopsis thaliana seeds and Pichia pastoris. To this end, VHH-Fc antibodies targeting green fluorescent protein or the A. thaliana seed storage proteins (albumin and globulin) were produced in the three platforms. Differences were mainly observed in the accumulation levels and glycosylation patterns. Interestingly, although in plants oligomannosidic N-glycans were expected for KDEL-tagged VHH-Fcs, several VHH-Fcs with an intact KDEL-tag carried complex-type N-glycans, suggesting a dysfunctional retention in the endoplasmic reticulum. All VHH-Fcs were equally functional across expression platforms and several outperformed their corresponding VHH in terms of sensitivity in ELISA.
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Affiliation(s)
- Thomas De Meyer
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
| | - Bram Laukens
- Department of Medical Protein Research, Unit for Medical Biotechnology, VIB, Gent, Belgium
- Department of Biochemistry and Microbiology, Laboratory for Protein Biochemistry and Biomolecular Engineering, Ghent University, Gent, Belgium
| | - Jonah Nolf
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
| | - Els Van Lerberge
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
| | - Riet De Rycke
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
| | - Ans De Beuckelaer
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
| | - Sylvie De Buck
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
| | - Nico Callewaert
- Department of Medical Protein Research, Unit for Medical Biotechnology, VIB, Gent, Belgium
- Department of Biochemistry and Microbiology, Laboratory for Protein Biochemistry and Biomolecular Engineering, Ghent University, Gent, Belgium
| | - Ann Depicker
- Department of Plant Systems Biology, VIB, Gent, Belgium
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Gent, Belgium
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Rotman M, Welling MM, van den Boogaard ML, Moursel LG, van der Graaf LM, van Buchem MA, van der Maarel SM, van der Weerd L. Fusion of hIgG1-Fc to 111In-anti-amyloid single domain antibody fragment VHH-pa2H prolongs blood residential time in APP/PS1 mice but does not increase brain uptake. Nucl Med Biol 2015; 42:695-702. [DOI: 10.1016/j.nucmedbio.2015.03.003] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/06/2015] [Accepted: 03/12/2015] [Indexed: 10/23/2022]
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Intracellular expression of camelid single-domain antibodies specific for influenza virus nucleoprotein uncovers distinct features of its nuclear localization. J Virol 2014; 89:2792-800. [PMID: 25540369 DOI: 10.1128/jvi.02693-14] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Perturbation of protein-protein interactions relies mostly on genetic approaches or on chemical inhibition. Small RNA viruses, such as influenza A virus, do not easily lend themselves to the former approach, while chemical inhibition requires that the target protein be druggable. A lack of tools thus constrains the functional analysis of influenza virus-encoded proteins. We generated a panel of camelid-derived single-domain antibody fragments (VHHs) against influenza virus nucleoprotein (NP), a viral protein essential for nuclear trafficking and packaging of the influenza virus genome. We show that these VHHs can target NP in living cells and perturb NP's function during infection. Cytosolic expression of NP-specific VHHs (αNP-VHHs) disrupts virus replication at an early stage of the life cycle. Based on their specificity, these VHHs fall into two distinct groups. Both prevent nuclear import of the viral ribonucleoprotein (vRNP) complex without disrupting nuclear import of NP alone. Different stages of the virus life cycle thus rely on distinct nuclear localization motifs of NP. Their molecular characterization may afford new means of intervention in the virus life cycle. IMPORTANCE Many proteins encoded by RNA viruses are refractory to manipulation due to their essential role in replication. Thus, studying their function and determining how to disrupt said function through pharmaceutical intervention are difficult. We present a novel method based on single-domain-antibody technology that permits specific targeting and disruption of an essential influenza virus protein in the absence of genetic manipulation of influenza virus itself. Characterization of such interactions may help identify new targets for pharmaceutical intervention. This approach can be extended to study proteins encoded by other viral pathogens.
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