Autolysis and ageing of Penicillium chrysogenum under carbon starvation: respiration and glucose oxidase production.
During the exponential growth phase of Penicillium chrysogenum NCAIM 00237 the effective conversion of glucose and O2 to gluconate and H2O2 by glucose oxidase (GOX) was the most likely source of intracellular ROS measured. In glucose-supplemented autolysing cultures, the increased of intracellular ROS concentration was attributed to respiration in the absence of any significant GOX activity. The induction of GOX and catalase by glucose and H2O2 was clearly age-dependent in P. chrysogenum. In ageing cryptic growth phase cultures, superoxide dismutase and cyanide-resistant respiration were the major elements of antioxidative defence but these activities were insufficient to prevent the progressive accumulation of ROS and the concomitant decrease in cell vitality.
Sámi
L
L
Department of Microbiology and Biotechnology, Faculty of Sciences, University of Debrecen, P.O. Box 63, H-4010 Debrecen, Hungary.
Karaffa
L
L
Emri
T
T
Pócsi
I
I
D017209:Apoptosis; D002374:Catalase / Q000378:metabolism; D003470:Culture Media; D003486:Cyanides / Q000494:pharmacology; D015966:Gene Expression Regulation, Fungal; D005947:Glucose / Q000378:metabolism* / Q000494:pharmacology; D005949:Glucose Oxidase / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000494:pharmacology; D010101:Oxygen Consumption / Q000502:physiology*; D010408:Penicillium chrysogenum / Q000187:drug effects / Q000254:growth & development* / Q000502:physiology*; D017382:Reactive Oxygen Species / Q000378:metabolism
D003470:Culture Media; D003486:Cyanides; D017382:Reactive Oxygen Species; D006861:Hydrogen Peroxide; D005949:Glucose Oxidase; D002374:Catalase; D005947:Glucose