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A receptor heteromer mediates the male perception of female attractants in plants.

TitleA receptor heteromer mediates the male perception of female attractants in plants.
Publication TypeJournal Article
Year of Publication2016
AuthorsWang T, Liang L, Xue Y, Jia P-F, Chen W, Zhang M-X, Wang Y-C, Li H-J, Yang W-C
Date Published2016 Mar 10
KeywordsArabidopsis, Arabidopsis Proteins, Capsella, Cell Membrane, Mutation, Ovule, Phenotype, Phosphotransferases, Pollen Tube, Protein Kinases, Protein Multimerization, Protein Structure, Quaternary, Protein Structure, Tertiary, Receptors, Cell Surface, Reproduction, Signal Transduction

Sexual reproduction requires recognition between the male and female gametes. In flowering plants, the immobile sperms are delivered to the ovule-enclosed female gametophyte by guided pollen tube growth. Although the female gametophyte-secreted peptides have been identified to be the chemotactic attractant to the pollen tube, the male receptor(s) is still unknown. Here we identify a cell-surface receptor heteromer, MDIS1-MIK, on the pollen tube that perceives female attractant LURE1 in Arabidopsis thaliana. MDIS1, MIK1 and MIK2 are plasma-membrane-localized receptor-like kinases with extracellular leucine-rich repeats and an intracellular kinase domain. LURE1 specifically binds the extracellular domains of MDIS1, MIK1 and MIK2, whereas mdis1 and mik1 mik2 mutant pollen tubes respond less sensitively to LURE1. Furthermore, LURE1 triggers dimerization of the receptors and activates the kinase activity of MIK1. Importantly, transformation of AtMDIS1 to the sister species Capsella rubella can partially break down the reproductive isolation barrier. Our findings reveal a new mechanism of the male perception of the female attracting signals.

Alternate JournalNature
PubMed ID26863186

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