Picture map of Europe with pins indicating European capital cities

Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

Explore research outputs by the European Policies Research Centre...

Oxygen enrichment effects on protein oxidation, proteolytic activity and the energy status of submerged batch cultures of Aspergillus niger B1-D

Li, Qiang and Harvey, Linda M. and McNeil, Brian (2008) Oxygen enrichment effects on protein oxidation, proteolytic activity and the energy status of submerged batch cultures of Aspergillus niger B1-D. Process Biochemistry, 43 (3). pp. 238-243. ISSN 1359-5113

Full text not available in this repository. Request a copy from the Strathclyde author

Abstract

Oxygen enrichment (sparging bioreactors with oxygen-enriched air) ameliorates oxygen limitation in batch cultures of Aspergillus niger B1-D, and although nutrient utilization rates for both the carbon source and the nitrogen source are higher in oxygen-enriched cultures, excess oxygen does not enhance specific growth rate, instead the 'extra' nutrient consumption is associated with defensive measures. Commencement of oxygen enrichment in early exponential phase leads to a transient rise in proteins showing oxidative damage (carbonylation), and to induction of enhanced proteolytic activity, which points to the antioxidant defense being temporarily overwhelmed, and that A. niger adapts to this oxidative environment by enhancing intracellular proteolytic activity to degrade damaged proteins which might otherwise accumulate under these conditions. Also the energy status of A. niger, reflected by intracellular ATP content, is found to be altered upon the commencement of oxygen enrichment and then reaches much lower levels than in the control. The reasons underlying this are discussed in the context of what is known regarding alternative respiration in industrial fungi.