Research Paper Volume 3, Issue 8 pp 768—781
PaCATB, a secreted catalase protecting Podospora anserina against exogenous oxidative stress
- 1 Institute of Molecular Biosciences and ‘Cluster of Excellence Macromolecular Complexes’, Department of Biosciences, J.W. Goethe-University, Max-von-Laue-Str. 9, D-60438 Frankfurt am Main, Germany
- 2 Protein Research Group, Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campus 55, DK-5230 Odense M, Denmark
Received: August 3, 2011 Accepted: August 10, 2011 Published: August 14, 2011https://doi.org/10.18632/aging.100360
How to Cite
A differential mass spectrometry analysis of secreted proteins from juvenile and senescent Podospora anserina cultures revealed age-related differences in protein profiles. Among other proteins with decreased abundance in the secretome of senescent cultures a catalase, termed PaCATB, was identified. Genetic modulation of the abundance of PaCATB identified differential effects on the phenotype of the corresponding strains. Deletion of PaCatB resulted in decreased resistance, over-expression in increased resistance against hydrogen peroxide. While the lifespan of the genetically modified strains was found to be unaffected under standard growth conditions, increased exogenous hydrogen peroxide stress in the growth medium markedly reduced the lifespan of the PaCatB deletion strain but extended the lifespan of PaCatB over-expressors. Overall our data identify a component of the secretome of P. anserina as a new effective factor to cope with environmental stress, stress that under natural conditions is constantly applied on organisms and influences aging processes.