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PLANT PHYSIOLOGY , Vol 113, Issue 4 1091-1100, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
The glossy1 Locus of Maize and an Epidermis-Specific cDNA from Kleinia odora Define a Class of Receptor-Like Proteins Required for the Normal Accumulation of Cuticular Waxes
J. D. Hansen, J. Pyee, Y. Xia, T. J. Wen, D. S. Robertson, P. E. Kolattukudy, B. J. Nikolau and P. S. Schnable
Department of Biochemistry and Biophysics (J.D.H., B.J.N.), Department of Agronomy (P.S.S.), and Department of Zoology and Genetics (Y.X., T-J.W., D.S.R., P.S.S.), Iowa State University, Ames, Iowa 50011
Mutations at the glossy1 (gl1) locus of maize (Zea mays L.) quantitatively
and qualitatively affect the deposition of cuticular waxes on the surface
of seedling leaves. The gl1 locus has been molecularly cloned by transposon
tagging with the Mutator transposon system. The epi23 cDNA was isolated by
subtractive hybridization as an epidermis-specific mRNA from Senecio odora
(Kleinia odora). The deduced amino acid sequence of the GL1 and EPI23
proteins are very similar to each other and to two other plant proteins in
which the sequences were deduced from their respective mRNAs. These are the
Arabidopsis CER1 protein, which is involved in cuticular wax deposition on
siliques, stems, and leaves of that plant, and the protein coded by the
rice expressed sequence tag RICS2751A. All four proteins are predicted to
be localized in a membrane via a common NH2-terminal domain, which consists
of either five or seven membrane-spanning helices. The COOH-terminal
portion of each of these proteins, although less conserved, is predicted to
be a water-soluble, globular domain. These sequence similarities indicate
that these plant orthologs may belong to a superfamily of membrane-bound
receptors that have been extensively characterized from animals, including
the HIV co-receptor fusin (also termed CXCR4).
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