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Journal of Experimental Botany, Vol. 53, No. 366, pp. 149-150, January 1, 2002
© 2002 Oxford University Press

Gene Notes

Cloning of a cDNA encoding an E2 ubiquitin-conjugating enzyme from Catharanthus roseus: expression analysis in plant organs and in response to hormones in cell suspensions

Yann Sibéril, Martine Thiersault, Gonçalo Nepumoceno, Pierre Doireau and Pascal Gantet2

EA 2106, Biomolécules et Biotechnologies Végétales, Université de Tours, UFR des Sciences et Techniques, Laboratoire de Physiologie Végétale, Parc de Grandmont, 37200 Tours, France

Abstract

A novel cDNA (Crubie2) encoding ubiquitin-conjugating enzyme E2 was isolated from a Catharanthus roseus cDNA library. Sequence comparison with Arabidopsis thaliana E2 sequences revealed that CrUBIE2 is a member of a new plant E2 sub-family. Expression of Crubie2 is repressed in developing organs and down-regulated by cytokinin suggesting that a decrease in the ubiquitin-dependent proteolytic pathway may take part in the regulation of alkaloid biosynthesis in C. roseus cell suspensions.

Key words: Catharanthus roseus, E2 ubiquitin-conjugating enzyme, cytokinin.


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