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- W2151139969 abstract "Almost all plant cells, even when fully differentiated, can dedifferentiate and proliferate in vitro to form a callus, in which they can then differentiate to form various organs. These sequential processes can be promoted by exposing the cells to a conditioned medium in which either the same or other cells have previously been grown, indicating the involvement of cell-to-cell communication mediated by a chemical factor. This factor was purified from the conditioned medium and identified as a 5-amino-acid sulfated peptide. The addition of this peptide, named phytosulfokine (PSK), to the culture medium, even at nanomolar concentrations, significantly promotes cellular proliferation and/or cellular differentiation. We purified a membrane receptor for PSK (PSKR1) by ligand-based affinity chromatography and identified it as a member of leucine-rich repeat receptor kinases. The PSK-binding domain of PSKR1 was further identified by ligand photoaffinity labeling using a novel on-column photoaffinity labeling methodology that allows repeated incorporation of the photoaffinity label. Analysis of loss-of-function and gain-of-function mutants of the Arabidopsis PSKR1 revealed that PSK signaling affects cellular longevity and potential for growth without interfering with basic plant morphogenesis. These results suggest that PSK represents a new class of hormones that affect the potential for cellular growth and longevity of individual cells via binding to PSKR1, thereby exerting a pleiotropic effect on individual cells in response to environmental conditions." @default.
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- W2151139969 date "2006-01-01" @default.
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- W2151139969 title "Identification and functional characterization of phytosulfokine receptor using a ligand-based approach" @default.
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- W2151139969 doi "https://doi.org/10.1002/tcr.20090" @default.
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