Import of glyoxysomal malate dehydrogenase precursor into glyoxysomes: A heterologous in-vitro system |
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Authors: | C Gietl B Hock |
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Institution: | (1) Department of Botany, Faculty of Agriculture and Horticulture, Technical University of Munich, D-8050 Freising 12, Germany |
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Abstract: | A heterologous in-vitro system is described for the import of the precursor to glyoxysomal malate dehydrogenase from watermelon (Citrullus vulgaris Schrad., cv. Kleckey's Sweet No. 6) cotyledons into glyoxysomes from castor-bean (Ricinus communis L.) endosperm. The 41-kDa precursor is posttranslationally sequestered and correctly processed to the mature 33-kDa subunit by a crude glyoxysomal fraction or by glyoxysomes purified on a sucrose gradient. The import and the cleavage of the extrasequence is not inhibited by metal chelators such as 1,10-phenanthroline and ethylenediaminetetraacetic acid. Uncouplers (carbonylcyanide m-chlorophenylhydrazone), ionophores (valinomycin), or inhibitors of oxidative phosphorylation (oligomycin) and ATP-ADP translocation (carboxyatractyloside) do not interfere, thus indicating the independence of the process of import by the organelle from the energization of the glyoxysomal membrane.Abbreviations CCCP
carbonylcyanide m-chlorophenylhydrazone
- EDTA
ethylenediaminetetraacctic acid
- gMDH
glyoxysomal malate dehydrogenase
- PMSF
phenylmethylsulfonyl fluoride |
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Keywords: | Citrullus Enzyme transport (posttranslational) Glyoxysome Malate dehydrogenase Ricinus |
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