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Proc Natl Acad Sci U S A. 1997 Apr 15;94(8):3554-9.

Conservation of function between mammalian and plant steroid 5alpha-reductases.

Author information

1
Plant Biology Laboratory, The Salk Institute, La Jolla, CA 92037, USA.

Abstract

Arabidopsis det2 mutants are small dark-green dwarfs displaying pleiotropic defects in light-regulated development during multiple stages of the plant life cycle. The DET2 gene encodes a protein that shares approximately 40% sequence identity with mammalian steroid 5alpha-reductases and is implicated in the synthesis of a class of plant steroids, the brassinosteroids. Here we show that the DET2 protein, when expressed in human embryonic kidney 293 cells, catalyzes the 5alpha-reduction of several animal steroid substrates and has similar kinetic properties to the mammalian steroid 5alpha-reductase enzymes. Moreover, human steroid 5alpha-reductases expressed in det2 mutant plants can substitute for DET2 in brassinosteroid biosynthesis. These data indicate that DET2 is an ortholog of the mammalian steroid 5alpha-reductases and provide further evidence that brassinosteroids play an essential role in light-regulated plant development. The structural and functional conservation between DET2 and human steroid 5alpha-reductases raise interesting issues concerning the evolutionary origin of the steroid hormone signaling system.

PMID:
9108014
PMCID:
PMC20477
DOI:
10.1073/pnas.94.8.3554
[Indexed for MEDLINE]
Free PMC Article

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