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A carrier fusion significantly induces unfolded protein response in heterologous protein production by Aspergillus oryzae

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Abstract

In heterologous protein production by filamentous fungi, target proteins are expressed as fusions with homologous secretory proteins, called carriers, for higher production yields. Although carrier fusion is thought to overcome the bottleneck in transcriptional and (post)translational processes during heterologous protein production, there is limited knowledge of its physiological effects on the host strain. In this study, we performed DNA microarray analysis by comparing gene expression patterns of two Aspergillus oryzae strains expressing either carrier- or non-carrier-fused bovine chymosin (CHY). When CHY was expressed as a fusion with α-amylase (AmyB), the production level increased by approximately 2-fold as compared with the non-carrier-fused CHY. DNA microarray analysis revealed that the carrier fusion significantly up-regulated many genes involved in endoplasmic reticulum (ER) protein-folding and secretion. Consistently, hacA transcripts were efficiently spliced in the strain expressing the carrier-fused CHY, indicating an unfolded protein response (UPR). The carrier-fused CHY was detected intracellularly without processing at the Kex2 cleavage site, which is likely recognized in the Golgi, and the carrier fusion delayed extracellular CHY production in the early growth phase as compared with the non-carrier-fused expression. Taken together, our data suggest a proposal that the carrier fusion temporarily accumulates the carrier-fused CHY in the ER and significantly induces UPR.

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Acknowledgements

This study was supported by a Grant-in-Aid for Scientific Research (S) and a Grant-in-Aid for Scientific Research on Priority Areas “Applied Genomics” from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan

    Ayako Ohno, Jun-ichi Maruyama, Takashi Nemoto, Manabu Arioka & Katsuhiko Kitamoto

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  1. Ayako Ohno
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  2. Jun-ichi Maruyama
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  3. Takashi Nemoto
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  4. Manabu Arioka
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  5. Katsuhiko Kitamoto
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Correspondence to Katsuhiko Kitamoto.

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Ohno, A., Maruyama, Ji., Nemoto, T. et al. A carrier fusion significantly induces unfolded protein response in heterologous protein production by Aspergillus oryzae . Appl Microbiol Biotechnol 92, 1197–1206 (2011). https://doi.org/10.1007/s00253-011-3487-9

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  • DOI: https://doi.org/10.1007/s00253-011-3487-9

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