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Plant Cell, Vol. 11, 207-222, February 1999, Copyright © 1999, American Society of Plant Physiologists

The Arabidopsis dw f 7/ste1 Mutant Is Defective in the {Delta}7 Sterol C-5 Desaturation Step Leading to Brassinosteroid Biosynthesis

Sunghwa Choea, Takahiro Noguchib, Shozo Fujiokab, Suguru Takatsutoc, Christophe P. Tissiera, Brian D. Gregorya, Amanda S. Rossa, Atsushi Tanakaa,d, Shigeo Yoshidab, Frans E. Taxa, and Kenneth A. Feldmanna
a Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
b Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351-0198, Japan
c Department of Chemistry, Joetsu University of Education, Joetsu-shi, Niigata 943-8512, Japan
d Department of Environment and Resources, Japan Atomic Energy Research Institute (JAERI), 1233 Watanuki-machi, Takasaki-shi, Gunma 370-1292, Japan

Correspondence to: Kenneth A. Feldmann, feldmann{at}ag.arizona.edu (E-mail), 520-621-7186 (fax)

Lesions in brassinosteroid (BR) biosynthetic genes result in characteristic dwarf phenotypes in plants. Understanding the regulation of BR biosynthesis demands continued isolation and characterization of mutants corresponding to the genes involved in BR biosynthesis. Here, we present analysis of a novel BR biosynthetic locus, dwarf7 (dwf7). Feeding studies with BR biosynthetic intermediates and analysis of endogenous levels of BR and sterol biosynthetic intermediates indicate that the defective step in dwf7-1 resides before the production of 24-methylenecholesterol in the sterol biosynthetic pathway. Furthermore, results from feeding studies with 13C-labeled mevalonic acid and compactin show that the defective step is specifically the {Delta}7 sterol C-5 desaturation, suggesting that dwf7 is an allele of the previously cloned STEROL1 (STE1) gene. Sequencing of the STE1 locus in two dwf7 mutants revealed premature stop codons in the first (dwf7-2) and the third (dwf7-1) exons. Thus, the reduction of BRs in dwf7 is due to a shortage of substrate sterols and is the direct cause of the dwarf phenotype in dwf7.




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