Abstract
Polyamine oxidase (EC 1.5.3.3) activity has not been detected previously in cells of dicotyledonous plants, although it has been characterized extensively in monocotyledonous plants. Evidence is presented in this report for the occurrence of polyamine oxidase in dialyzed crude extracts of the dicotyledonous plant, Medicago sativa L. (alfalfa). Three enzyme assays were used to quantitate the formation of the three products of the reaction catalyzed by polyamine oxidase. 1-Pyrroline formation was measured colorimetrically as a yellow quinazolinium complex with o-aminobenzaldehyde. Hydrogen peroxide formation was measured spectrophotometrically with a coupled peroxidase assay system by peroxidative oxidation of guaiacol. [3H]1,3-Diaminopropane formation was measured by using [1,8-3H]spermidine as the substrate and separating the radiolabelled reaction product from the substrate by paper electrophoresis. This latter assay provided evidence that a polyamine oxidase of type [EC 1.5.3.3] catalyzed the cleavage reaction between a secondary nitrogen atom and an adjacent carbon of the butyl moiety of spermidine. Significant polyamine oxidase activity was detected in floral tissues, cortex tissues of the root, young leaves, and young germinated seedlings of alfalfa. The occurrence of polyamine oxidase in alfalfa accounts for the formation of the essential substrate, 1,3-diaminopropane, required for the biosynthesis of the uncommon polyamines, norspermidine and norspermine, which we have recently detected in alfalfa.
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Abbreviations
- PAO:
-
polyamine oxidase
- MOPS:
-
[3-(N-morpholino)propanesulfonic acid]
- MES:
-
[2-(N-morpholino)ethanesulfonic acid]
- TES:
-
[N-tris (hydroxymethyl)methyl-2-aminoethanesulfonic acid]
- BICINE:
-
[N,N-bis (2-hydroxyethyl)glycine]
- DTC:
-
diethyldithiocarbamic acid
- Rm :
-
the distance of migration of a polyamine relative to putrescine after electrophoresis on paper
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Communicated by J. M. Widholm
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Bagga, S., Dharma, A., Phillips, G.C. et al. Evidence for the occurrence of polyamine oxidase in the dicotyledonous plant Medicago sativa L. (alfalfa). Plant Cell Reports 10, 550–554 (1991). https://doi.org/10.1007/BF00232509
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DOI: https://doi.org/10.1007/BF00232509