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PLANT PHYSIOLOGY , Vol 115, Issue 2 501-510, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Sequence Analysis of the Cloned glossy8 Gene of Maize Suggests That It May Code for a [beta]-Ketoacyl Reductase Required for the Biosynthesis of Cuticular Waxes
X. Xu, C. R. Dietrich, M. Delledonne, Y. Xia, T. J. Wen, D. S. Robertson, B. J. Nikolau and P. S. Schnable
Departments of Zoology and Genetics (X.X., C.R.D., M.D., Y.X., T.-J.W., D.S.R., P.S.S.), Agronomy (P.S.S.), and Biochemistry and Biophysics (B.J.N.), Iowa State University, Ames, Iowa 50011
The gl8 locus of maize (Zea mays L.) was previously defined by a mutation
that reduces the amount and alters the composition of seedling cuticular
waxes. Sixty independently derived gl8 mutant alleles were isolated from
stocks that carried the Mutator transposon system. A DNA fragment that
contains a Mu8 transposon and that co-segregates with one of these alleles,
gl8-Mu3142, was identified and cloned. DNA flanking the Mu8 transposon was
shown via allelic cross-referencing experiments to represent the gl8 locus.
The gl8 probe revealed a 1.4-kb transcript present in wild-type seedling
leaves and, in lesser amounts, in other organs and at other developmental
stages. The amino acid sequence deduced from an apparently full-length gl8
cDNA exhibits highly significant sequence similarity to a group of enzymes
from plants, eubacteria, and mammals that catalyzes the reduction of
ketones. This finding suggests that the GL8 protein probably functions as a
reductase during fatty acid elongation in the cuticular wax biosynthetic
pathway.
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