The correlation of oxygen and sugar dependent regulation of glycolysis to the biocontrol activity of the yeast Pichia anomala
2003 (English)In: Yeast, ISSN 0749-503X, E-ISSN 1097-0061, Vol. 20, S352-S352 p.Article in journal, Meeting abstract (Other academic) Published
Pichia anomala inhibits growth of mould during airtight storage of moist cereal grain for animal feed. The cereal grain is stored in large airtight containers where the anaerobic environment prevents growth of mould. Air can leak into the system due to the removal of grain or technical difficulties in keeping completely anaerobic conditions. This subsequently enables growth of spoilage moulds. Addition of P. anomala cells inhibits the growth of mould making the system more robust . We analysed the physiological basis of the biocontrol activity. P. anomala is a Crabtree negative yeast but in contrast to other Crabtree negative organisms it can grow under anaerobic conditions . The ability to switch between respiratory and fermentative growth in response to O2-availability is essential for its survival in the airtight system and for its biocontrol activity. End products of the sugar metabolism had inhibitory effects on mould growth. Addition of glucose to a model biocontrol system enhanced biocontrol activity without increasing yeast biomass, suggesting the involvement of a product of glycolysis in biocontrol. Sugar consumption, production of ethanol and other metabolites and the activity of key enzymes were investigated in cells grown under defined conditions of oxygen and nutrient supply. The impact of the different parameters on biocontrol activity is discussed.  Druvefors et al. (2002) FEMS Yeast Res. 2: 389-394  Fredlund et al. (2002) FEMS Yeast Res. 2: 395-402
Place, publisher, year, edition, pages
John Wiley & Sons, 2003. Vol. 20, S352-S352 p.
Biochemistry and Molecular Biology Microbiology
IdentifiersURN: urn:nbn:se:oru:diva-52356ISI: 000184161800840OAI: oai:DiVA.org:oru-52356DiVA: diva2:972064
21st International Conference on Yeast Genetics and Molecular Biology, Gotheburg, Sweden, July 7-12, 2003