Abstract
Peroxidases (EC 1.11.1.7) from hypocotyls of Lupinus albus L. cv. Rio Maior have been characterised using one- and two-dimensional, native electrophoretic techniques. Data are presented showing the complexity in charge and molecular size or shape of these peroxidases. We report the finding of a new acidic peroxidase and several new basic peroxidases in these hypocotyls, and of their stability to treatments considered to break ligand-induced variants and conformational variants derived from differences in polypeptide folding. Densitometric data demonstrate that these new peroxidases contribute up to 60‰ of the total peroxidase activity in hypocotyls. Studies of intercellular fluid, cell-wall and soluble fractions, with assays of purity were conducted in an attempt to define the subcellular locations of these additional peroxidases. The acidic form (pI 4.1) is greatly enriched in soluble fractions, three of the basic peroxidases (pIs 9.5, 9.7 and >9.7) are strongly associated to the cell wall, ad a minor, basic component (pI 9.7) is enriched in the intercellular fluid. Individual peroxidase activities with the substrates coniferyl alcohol, ferulic acid or indole acetic acid were compared by densitometric analysis of zymograms with those for guaiacol, and notable differences between these peroxidases in their capacity to oxidise indole acetic acid in vitro were identified. The possible functions of these peroxidases in vivo and their implications to current understanding of peroxidases in L. albus are discussed.
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Abbreviations
- APAGE:
-
anionic polyacrylamide gel electrophoresis
- CA:
-
coniferyl alcohol
- CPAGE:
-
cationic polyacrylamide gel electrophoresis
- IEF:
-
isoelectric focusin
- NEIEF:
-
non-equilibrated isoelectric focusing
- 2D:
-
two dimensional
- pI:
-
isoelectric point
- RCPAGE:
-
reversed current polyacrylamide gel electrophoresis
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Jackson, P., Ricardo, C.P.P. An examination of the peroxidases from Lupinus albus L. hypocotyls. Planta 194, 311–317 (1994). https://doi.org/10.1007/BF00197530
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DOI: https://doi.org/10.1007/BF00197530