Identification of Non-Heme Diiron Proteins That Catalyze Triple Bond and Epoxy Group Formation

Author:

Lee Michael12345,Lenman Marit12345,Banaś Antoni12345,Bafor Maureen12345,Singh Surinder12345,Schweizer Michael12345,Nilsson Ralf12345,Liljenberg Conny12345,Dahlqvist Anders12345,Gummeson Per-Olov12345,Sjödahl Staffan12345,Green Allan12345,Stymne Sten12345

Affiliation:

1. M. Lee, Svalöv-Weibull AB, S-268 81 Svalöv, Sweden.

2. M. Lenman, A. Banaś, M. Bafor, A. Dahlqvist, P. Gummeson, S. Stymne, Department of Plant Breeding Research, Swedish University of Agricultural Sciences, S-268 31 Svalöv, Sweden.

3. S. Singh and A. Green, Commonwealth Scientific and Industrial Research Organization (CSIRO) Plant Industry, Canberra ACT 2601, Australia.

4. M. Schweizer and S. Sjödahl, Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, UK.

5. R. Nilsson and C. Liljenberg, Department of Plant Physiology, University of Gothenburg, S-413 19 Gothenburg, Sweden.

Abstract

Acetylenic bonds are present in more than 600 naturally occurring compounds. Plant enzymes that catalyze the formation of the Δ12 acetylenic bond in 9-octadecen-12-ynoic acid and the Δ12 epoxy group in 12,13-epoxy-9-octadecenoic acid were characterized, and two genes, similar in sequence, were cloned. When these complementary DNAs were expressed in Arabidopsis thaliana , the content of acetylenic or epoxidated fatty acids in the seeds increased from 0 to 25 or 15 percent, respectively. Both enzymes have characteristics similar to the membrane proteins containing non–heme iron that have histidine-rich motifs.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference31 articles.

1. F. Bohlman T. Burkhardt C. Zdero Naturally Occurring Acetylenes (Academic Press New York 1973).

2. Badami R. C., Patil K. B., Prog. Lipid Res.19, 119 (1981).

3. Kohn G., Hartman E., Stymne S., Beutelmann P. J., J. Plant Physiol.144, 265 (1994).

4. Haigh W. G., Morris L. J., James A. T., Lipids3, 307 (1968).

5. Earle F. R., Barclay A. S., Wolff I. A., ibid1, 325 (1966).

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