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Identification and expression studies of a catalase and a bifunctional catalase-peroxidase in Frankia strain R43
Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).ORCID iD: 0000-0002-0536-903X
2003 (English)In: Plant and Soil, ISSN 0032-079X, E-ISSN 1573-5036, Vol. 254, no 1, 75-81 p.Article in journal (Refereed) Published
Abstract [en]

A monofunctional catalase and a bifunctional catalase-peroxidase were revealed by activity staining of nondenaturing PAGE in Frankia strain R43. Both enzymes were shown to be cytoplasmatic, growth regulated and expressed mainly during the stationary growth phase. Nevertheless, low levels of constitutive expression could also be detected during the early stages of growth. Immunoblot analyses using a polyclonal antibody raised against a catalase-peroxidase purified from Streptomyces reticuli showed a band of 83.2 kDa, with the same growth dependent pattern as obtained by the non-denaturing PAGE analyses. Induction studies revealed that both enzymes were strongly induced by raising the intracellular concentration of H2O2 with paraquat, but not with exogenous H2O2. In addition, no acquisition of tolerance to exogenous H2O2 was observed whatever the pretreatment of the inocula, i.e. despite the expression level of both hydroperoxidases.

Place, publisher, year, edition, pages
2003. Vol. 254, no 1, 75-81 p.
Keyword [en]
actinorhizal nodules, catalase, catalase-peroxidase, Frankia, hydroperoxidases
Identifiers
URN: urn:nbn:se:umu:diva-44755ISI: 000184471500009OAI: oai:DiVA.org:umu-44755DiVA: diva2:424372
Available from: 2011-06-17 Created: 2011-06-09 Last updated: 2017-12-11

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