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JXB Advance Access originally published online on December 12, 2003
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Journal of Experimental Botany, Vol. 55, No. 396, pp. 543-545, February 1, 2004
© 2004 Oxford University Press

GENE NOTE

Functional characterization of the Arabidopsis thaliana orthologue of Tsc13p, the enoyl reductase of the yeast microsomal fatty acid elongating system

Received 3 September 2003; Accepted 7 November 2003

Kenneth Gable1, Sarah Garton2, Johnathan A. Napier2 and Teresa M. Dunn1,*

1 Department of Biochemistry and Molecular Biology, Uniformed Services University of the Health Sciences, 4301 Jones Bridge Road, Bethesda, MD 21084, USA
2 Rothamsted Research, Harpenden, Herts AL5 2JQ, UK

* To whom correspondence should be addressed: Fax: +1 301 295 3512. E-mail: tdunn{at}usuhs.mil

The protein encoded by the Arabidopsis At3g55360 gene was selected as a candidate for the enoyl reductase of the microsomal elongase system based on its homology to the Tsc13p protein of S. cerevisiae. The studies presented here demonstrate that heterologous expression of At3g55360 functionally complements the temperature-sensitive phenotype of a yeast tsc13 mutant that is deficient in enoyl reductase activity. Furthermore, AtTSC13 is shown to interact physically with the Elo2p and Elo3p components of the yeast elongase complex. At3g55360 apparently encodes the sole enoyl reductase activity associated with microsomal fatty acid elongation in Arabidopsis. Consistent with this conclusion, AtTSC13 is ubiquitously expressed in Arabidopsis.

Key words: Arabidopsis, elongase, enoyl-CoA reductase, fatty acid elongation, very long chain fatty acids, VLCFAs.


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