Abstract
Nucleoside hydrolase and sterol 24-c-methyltransferase, two antigenic proteins of Leishmania sp., were expressed in Aspergillus niger. Genetic transformation of conidia was achieved using underwater shock waves. scFv antibody addressed to DEC205, a receptor of dendritic cells, was fused to two proteins of Leishmania sp. Receptor 205 has a relevant role in the immune system in mammals; it can modulate T cell response to different antigens. Extracellular expression strategy of recombinant antibody was achieved using a fragment of native glucoamylase A (514 aa) as a carrier. Fermentations in shake flasks showed that the recombinant protein (104 kDa) was expressed and secreted only when maltose was used as carbon source; on the contrary, the expression was highly repressed in presence of xylose. Noteworthy, recombinant protein was secreted without glucoamylase-carrier and accumulation at intracellular level was not observed. The results presented here demonstrate the high value of Aspergillus niger as biotechnological platform for recombinant antibodies against Leishmania sp. at low cost. To the best of our knowledge, this is the first report about the recombinant expression of antigenic proteins of Leishmania sp. in filamentous fungi. The protein obtained can be used to explore novel strategies to induce immunity against Leishmania sp. or it can be employed in diagnostic kits to detect this neglected disease.
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Acknowledgements
The authors would like to thank Ma. Concepción Arredondo, René Preza and Guillermo Vázquez for technical assistance. D.M.O. gratefully acknowledges the support of a Ph.D. scholarship (Number 219950) from CONACYT.
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Magaña-Ortíz, D., Fernández, F., Loske, A.M. et al. Extracellular Expression in Aspergillus niger of an Antibody Fused to Leishmania sp. Antigens. Curr Microbiol 75, 40–48 (2018). https://doi.org/10.1007/s00284-017-1348-1
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DOI: https://doi.org/10.1007/s00284-017-1348-1