Skip to main content

Native and heterologous protein oxidation and subsequent degradation in a recombinant filamentous fungus Aspergillus niger B1-D

Filamentous fungi have attracted extensive research interest due to their abilities to secrete large amounts of high-valued recombinant proteins. Despite the fact that proteases have been recognized as one of the main problems in protein production, little is known about the regulation of them. In the present study, we hypothesized that reactive oxygen species (ROS), unavoidable by-products in all aerobic cultures, may cause protein oxidation and induce proteolysis in filamentous fungi. To test this hypothesis, we used a variety of oxidative stressors, oxygenation, menadione, hydrogen peroxide, hydrogen peroxide with copper ion, to study the induction of intracellular proteolytic activities in A. niger B1-D, a recombinant filamentous fungus secreting hen egg white lysozyme. Protein carbonyl content was monitored as a bio-marker for protein oxidation. Our results show that oxygenation and metal-catalyzed oxidation significantly induce carbonyl groups to bovine serum albumin (BSA). We also found that proteolytic activities and carbonyl content increase on the addition of these stressors to the whole broth in A. niger B1-D, and the responses are dose-dependent. In conclusion, ROS overproduction correlates with protein oxidation and proteolysis in A. niger B1-D. It is advisable to decrease ROS production in the bioprocess of filamentous fungi in order to achieve a higher productivity of heterologous proteins.

Author information

Affiliations

Authors

Corresponding author

Correspondence to Qiang Li.

Rights and permissions

Open Access This article is published under license to BioMed Central Ltd. This is an Open Access article is distributed under the terms of the Creative Commons Attribution 2.0 International License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reprints and Permissions

About this article

Cite this article

Li, Q., Harvey, L.M. & McNeil, B. Native and heterologous protein oxidation and subsequent degradation in a recombinant filamentous fungus Aspergillus niger B1-D. Microb Cell Fact 5, P6 (2006). https://doi.org/10.1186/1475-2859-5-S1-P6

Download citation

Keywords

  • Reactive Oxygen Species
  • Lysozyme
  • Proteolytic Activity
  • Filamentous Fungus
  • Protein Carbonyl