Summary
A new and unique catalase isozyme, CAT-3, has been found in Zea mays. It is encoded in the Cat3 nuclear structural gene which is distinct from the two previously described catalase structural genes, Cat1 and Cat2. The Cat3 gene is both tissue- and time-dependent in its expression, being expressed primarily in young leaves and in the pericarp of nearly mature kernels. Cell fractionation experiments, utilizing epicotyl (coleoptile+primary leaf) and mesocotyl cells, suggest that CAT-3 is associated with the mitochrondria where it may play a role in the alternate oxidase pathway. CAT-3 was purified and characterized with respect to some of its biochemical properties. While CAT-3 differs in some of its properties from CAT-1 and CAT-2, it is similar to these and to other catalases in most respects.
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Communicated by H. Böhme
Research supported by National Institutes of Health Grant No. GM 22733 to JGS.
Paper No. 5255 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh, NC.
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Scandalios, J.G., Tong, WF. & Roupakias, D.G. Cat3, a third gene locus coding for a tissue-specific catalase in maize: Genetics, intracellular location, and some biochemical properties. Molec. Gen. Genet. 179, 33–41 (1980). https://doi.org/10.1007/BF00268443
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DOI: https://doi.org/10.1007/BF00268443