PRT6/At5g02310 encodes an Arabidopsis ubiquitin ligase of the N-end rule pathway with arginine specificity and is not the CER3 locus |
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Authors: | Garzón Marcus Eifler Karolin Faust Andrea Scheel Hartmut Hofmann Kay Koncz Csaba Yephremov Alexander Bachmair Andreas |
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Affiliation: | Department of Plant Developmental Biology, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, Cologne, Germany. |
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Abstract: | The eukaryotic N-end rule pathway mediates ubiquitin- and proteasome-dependent turnover of proteins with a bulky amino-terminal residue. Arabidopsis locus At5g02310 shows significant similarity to the yeast N-end rule ligase Ubr1. We demonstrate that At5g02310 is a ubiquitin ligase and mediates degradation of proteins with amino-terminal Arg residue. Unlike Ubr1, the Arabidopsis protein does not participate in degradation of proteins with amino-terminal Phe or Leu. This modified target specificity coincides with characteristic differences in domain structure. In contrast to previous publications, our data indicate that At5g02310 is not identical to CER3, a gene involved in establishment of a protective surface wax layer. At5g02310 has therefore been re-designated PROTEOLYSIS 6 (PRT6), in accordance with its ubiquitin ligase function. |
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Keywords: | CER3 N-end rule Ubiquitin Wax biosynthesis Arabidopsis |
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