Abstract:
:Hemagglutinin, the major surface protein of influenza viruses, was recombinantly expressed in eukaryotic cells as a monomer instead of its native trimer, and was only immunogenic when administered with an adjuvant [Pion et al. 2014]. In order to multimerize this antigen to increase its immunogenicity, a cysteine-rich peptide sequence found at the extreme C-terminus of lamprey variable lymphocyte receptor (VLR)-B antibodies was fused to various recombinant hemagglutinin (rHA) proteins from A and B influenza virus strains. The rHA-Lamp fusion (rHA fused to the lamprey sequence) protein was expressed in Leishmania tarentolae and Chinese hamster ovary (CHO) cells and shown to produce several multimeric forms. The multimers produced were very stable and more immunogenic in mice than monomeric rHA. The lamprey VLR-B sequence was also used to multimerize the neuraminidase (NA) of influenza viruses expressed in CHO cells. For some viral strains, the NA was expressed as a tetramer like the native viral NA form. In addition, the lamprey VLR-B sequence was fused with two surface antigens of Shigella flexneri 2a, the invasion plasmid antigen D and a double mutated soluble form of the membrane expression of the invasion plasmid antigen H namely MxiH. The fusion proteins were expressed in Escherichia coli to produce the respective multimer protein forms. The resulting proteins had similar multimeric forms as rHA-Lamp protein and were more immunogenic in mice than the monomer forms. In conclusion, the VLR-B sequence can be used to increase the immunogenicity of recombinant viral and bacterial antigens, thus negating the need for adjuvants.
journal_name
Vaccinejournal_title
Vaccineauthors
Peubez I,Margot S,Buffin S,Pion C,Bernard MC,Dinadayala P,Poncet D,Deloire S,Marco S,Legastelois Idoi
10.1016/j.vaccine.2020.10.073subject
Has Abstractpub_date
2020-11-25 00:00:00pages
7905-7915issue
50eissn
0264-410Xissn
1873-2518pii
S0264-410X(20)31393-1journal_volume
38pub_type
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