The Arabidopsis thaliana multifunctional protein gene (MFP2) of peroxisomal beta-oxidation is essential for seedling establishment

The Plant Journal : for Cell and Molecular Biology
E L RylottI A Graham

Abstract

The multifunctional protein (MFP) of peroxisomal beta-oxidation catalyses four separate reactions, two of which (2-trans enoyl-CoA hydratase and L-3-hydroxyacyl-CoA dehydrogenase) are core activities required for the catabolism of all fatty acids. We have isolated and characterized five Arabidopsis thaliana mutants in the MFP2 gene that is expressed predominantly in germinating seeds. Seedlings of mfp2 require an exogenous supply of sucrose for seedling establishment to occur. Analysis of mfp2-1 seedlings revealed that seed storage lipid was catabolized more slowly, long-chain acyl-CoA substrates accumulated and there was an increase in peroxisome size. Despite a reduction in the rate of beta-oxidation, mfp2 seedlings are not resistant to the herbicide 2,4-dichlorophenoxybutyric acid, which is catabolized to the auxin 2,4-dichlorophenoxyacetic acid by beta-oxidation. Acyl-CoA feeding experiments show that the MFP2 2-trans enoyl-CoA hydratase only exhibits activity against long chain (C18:0) substrates, whereas the MFP2 L-3-hydroxyacyl-CoA dehydrogenase is active on C6:0, C12:0 and C18:0 substrates. A mutation in the abnormal inflorescence meristem gene AIM1, the only homologue of MFP2, results in an abnormal inflorescence meris...Continue Reading

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Citations

Jan 1, 2006·The Arabidopsis Book·Steven PenfieldIan A Graham
Nov 4, 2011·Plant Molecular Biology·Bibi Rafeiza KhanBethany K Zolman
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