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. 2017 Dec;245(Pt B):1334-1342.
doi: 10.1016/j.biortech.2017.05.140. Epub 2017 May 22.

Expression System for Heterologous Protein Expression in the Filamentous Fungus Aspergillus Unguis

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Expression System for Heterologous Protein Expression in the Filamentous Fungus Aspergillus Unguis

Aravind Madhavan et al. Bioresour Technol. .

Abstract

Heterologous protein expression in filamentous fungi is advantageous, especially in the context of large scale production of high volume low value recombinant proteins. However, such systems are rare and not available in public domain. A novel filamentous fungus - Aspergillus unguis NII 08123 was used as host for developing a protein expression system. An expression cassette was assembled using A. nidulans glyceraldehyde 3 phosphate dehydrogenase promoter (Pgapd), tryptophan synthase transcription terminator (TtrpC) and hygromycin resistance gene (hph) as selection marker. The enhanced green fluorescent protein (GFP) gene from Aequorea victoria was used as the model test protein for the evaluation of the expression system. The genetic transformation of this novel fungus was optimized through electroporation. Use of heterologous signal peptides resulted in high levels of secreted expression. The fungal host-expression system combination was tested successfully for the expression of the recombinant therapeutic protein-human interferon beta (HuIFNβ).

Keywords: Aspergillus; Heterologous proteins; Human interferon beta; Promoter; Secretion signal.

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