Abstract
1-Aminocyclopropane-1-carboxylic acid (ACC) is known to be converted to ethylene and conjugated into N-malonyl-ACC in plant tissues. When α-amino[1-14C]isobutyric acid (AIB), a structural analog of ACC, was administered to mungbean (Vigna radiata L.) hypocotyl segments, it was metabolized to 14CO2 and conjugated to N-malonyl-AIB (MAIB). α-Aminoisobutyric acid inhibited the conversion of ACC to ethylene and also inhibited, to a lesser extent, N-malonylation of ACC and d-amino acids. Although the malonylation of AIB was strongly inhibited by ACC as well as by d-amino acids, the metabolism of AIB to CO2 was inhibited only by ACC but not by d-amino acids. Inhibitors of ACC conversion to ethylene such as anaerobiosis, 2,4-dinitrophenol and Co2+, similarly inhibited the conversion of AIB to CO2. These results indicate that the malonyalation of AIB to MAIB is intimately related to the malonylation of ACC and d-amino acids, whereas oxidative decarboxylation of AIB is related to the oxidative degradation of ACC to ethylene.
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Abbreviations
- ACC:
-
1-aminocyclopropane-1-carboxylic acid
- AIB:
-
α-aminoisobutyric acid
- MACC:
-
1-(malonylamino)-cyclopropane-1-carboxylic acid
- MAIB:
-
α-(malonylamino)-isobutyric acid
- Mes:
-
2-(N-morpholino)ethanesulfonic acid
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Liu, Y., Su, Ly. & Yang, S.F. Metabolism of α-aminoisobutyric acid in mungbean hypocotyls in relation to metabolism of 1-aminocyclopropane-1-carboxylic acid. Planta 161, 439–443 (1984). https://doi.org/10.1007/BF00394575
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DOI: https://doi.org/10.1007/BF00394575