The defective kernel 1 (dek1) gene required for aleurone cell development in the endosperm of maize grains encodes a membrane protein of the calpain gene superfamily
| Autor: | Evgueni Ananiev, Robert B. Meeley, Stein Erik Lid, Xiaomu Niu, Jennifer Ann Lorentzen, Scott A. Nichols, Rudolf Jung, Odd-Arne Olsen, Darren Fred Gruis, Mark A. Chamberlin |
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| Rok vydání: | 2002 |
| Předmět: |
Molecular Sequence Data
Arabidopsis Cell fate determination Genes Plant Zea mays Endosperm Aleurone Amino Acid Sequence Cloning Molecular Alleles Plant Proteins Multidisciplinary biology Sequence Homology Amino Acid Cell growth Calpain Reverse Transcriptase Polymerase Chain Reaction fungi Cell Membrane food and beverages Biological Sciences biology.organism_classification Transmembrane protein Protein Structure Tertiary Cysteine Endopeptidases Phenotype Biochemistry Multigene Family Mutation biology.protein RNA Signal transduction Signal Transduction |
| Zdroj: | Proceedings of the National Academy of Sciences of the United States of America. 99(8) |
| ISSN: | 0027-8424 |
| Popis: | Endosperm of cereal grains is one of the most important renewable resources for food, feed, and industrial raw material. It consists of four triploid cell types, i.e., aleurone, starchy endosperm, transfer cells, and cells of the embryo surrounding region. In maize, the aleurone layer is one cell layer thick and covers most of the perimeter of the endosperm. Specification of maize aleurone cell fate is proposed to occur through activation of the tumor necrosis factor receptor-like receptor kinase CRINKLY4. A second maize gene essential for aleurone cell development is defective kernel 1 ( dek1 ). Here we show that DEK1 shares high homology with animal calpains. The predicted 2,159-aa DEK1 protein has 21 transmembrane regions, an extracellular loop, and a cysteine proteinase domain that shares high homology with domain II of m -calpain from animals. We propose that DEK1 functions to maintain and restrict the aleurone cell fate imposed by CR4 through activation of its cysteine proteinase by contact with the outer endosperm surface. DEK1 seems to be the only member of the calpain superfamily in plants, Arabidopsis DEK1 sharing 70% overall identity with maize DEK1. The expression of dek1 in most plant tissues in maize and Arabidopsis , as well as its presence in a variety of higher plants, including angiosperms and gymnosperms, suggests that DEK1 plays a conserved role in plant signal transduction. |
| Databáze: | OpenAIRE |
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