Journal Article

AtUCP2: a Novel Isoform of the Mitochondrial Uncoupling Protein of <i>Arabidopsis thaliana</i>

Akio Watanabe, Mikio Nakazono, Nobuhiro Tsutsumi and Atsushi Hirai

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 40, issue 11, pages 1160-1166
Published in print January 1999 | ISSN: 0032-0781
Published online January 1999 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029501
AtUCP2: a Novel Isoform of the Mitochondrial Uncoupling Protein of Arabidopsis thaliana

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  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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Mitochondrial uncoupling proteins (UCPs) play a central role in adaptive thermogenesis in mammals. The UCPs dissipate the proton gradient formed through respiration without ATP synthesis, and the freed energy is readily converted to heat, helping the animals to maintain their body temperature in cold environments. Recently, it was found that UCPs also function in plant mitochondria. Subsequently, a cDNA clone encoding a UCP in potato was isolated. Whereas the UCP gene constitutes a multigene family in mammals, only a single cDNA sequence has been reported so far for the potato UCP. Moreover, it has been recently suggested that Arabidopsis has only a single nuclear gene for UCP. Here we report the existence of another UCP gene in the Arabidopsis genome, showing for the first time the occurrence of a multigene family for the protein in higher plants. A cDNA analysis of this gene showed that the novel isoform possesses all typical features reported for known UCPs. However, the new gene, unlike the other gene in Arabidopsis and the gene in potato, did not appear to respond to low temperature.

Keywords: Arabidopsis; Gene expression; Low temperature; Mitochondria; Uncoupling protein

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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