Abstract
The development of glyoxysomal malate dehydrogenase (gMDH, EC 1.1.1.37) during early germination of watermelon seedlings (Citrullus vulgaris Schrad.) was determined in the cotyledons by means of radial immunodiffusion. The active isoenzyme was found to be absent in dry seeds. By density labelling with deuterium oxide and incorporation of [14C] amino acids it was shown that the marked increase of gMDH activity in the cotyledons during the first 4 days of germination was due to de novo synthesis of the isoenzyme. The effects of protein synthesis inhibitors (cycloheximide and chloramphenicol) on the synthesis of gMDH indicated that the glyoxysomal isoenzyme was synthesized on cytoplasmic ribosomes. Possible mechanisms by which the glyoxysomal malate dehydrogenase isoenzyme reaches its final location in the cell are discussed.
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Abbreviations
- mMDH:
-
mitochondrial malate dehydrogenase
- gMDH:
-
glyoxysomal malate dehydrogenase
- D2O:
-
deuterium oxide
- EDTA:
-
ethylenediaminetetraacetic acid, disodium salt
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Walk, R.A., Hock, B. Glyoxysomal malate dehydrogenase of watermelon cotyledons: De novo synthesis on cytoplasmic ribosomes. Planta 134, 277–285 (1977). https://doi.org/10.1007/BF00384194
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DOI: https://doi.org/10.1007/BF00384194