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- W4380741616 abstract "Abstract Ethylene signalling represents one of the classic hormonal pathways in plants, with diverse roles in development and stress responses. The dimeric ethylene receptor localizes to the endoplasmic reticulum (ER) and contains Cu(I) ions essential for ethylene binding and signalling. As for other vesicular cupro-proteins, the final step of Cu(I) maturation at the ER is undefined. We previously discovered that mutants in the Arabidopsis gene POLARIS ( PLS ), encoding a 36 amino acid peptide, exhibit constitutive ethylene signalling responses. Here we report a 1:2 thiol-dependent Cu(I):PLS 2 complex, with an affinity of 3.79 (±1.5) x10 19 M -2 . We demonstrate PLS interactions with the transmembrane domain of receptor protein ETR1, the Cu(I) chaperones ATX1 and CCH, and Cu(I)-transporting P 1B -type ATPase RAN1 at the ER. Formation of Cu(I)-dependent PLS- cuproprotein adducts at the ER provides a mechanism to modulate the metalation of ETR1, thereby regulating its activity and representing a novel mechanism for plant hormone receptor regulation. One Sentence Summary The POLARIS peptide of Arabidopsis regulates activity of the ethylene hormone receptor by controlling Cu(I) availability." @default.
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- W4380741616 date "2023-06-15" @default.
- W4380741616 modified "2023-09-27" @default.
- W4380741616 title "A peptide that regulates metalation and function of the<i>Arabidopsis</i>ethylene receptor" @default.
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- W4380741616 doi "https://doi.org/10.1101/2023.06.15.545071" @default.
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