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Abstract
A commonly accepted view of plant growth hormones is that their interaction with the cognate receptor protein is reversible, so that each hormone molecule can potentially interact multiple times with a receptor and so either amplify the hormone signal or maintain it over an extended period of time. The signal can be ‘cancelled’ by degrading the hormone. Strigolactones present us with a potentially new paradigm. The receptor is a serine hydrolase-type protein which attacks the strigolactone resulting in covalent modification of the receptor, while at the same time destroying the hormone. Strigolactone is apparently a one-use ‘disposable’ hormone.
Highlights
A commonly accepted view of plant growth hormones is that their interaction with the cognate receptor protein is reversible, so that each hormone molecule can potentially interact multiple times with a receptor and so either amplify the hormone signal or maintain it over an extended period of time
Many mutants were isolated in pea (Pisum sativum), rice (Oryza sativa), Arabidopsis (Arabidopsis thaliana) and petunia (Petunia hybrida) which led to the identification of the genes responsible
One of these encodes an F-box protein known as MORE AXILLARY GROWTH2 (MAX2) in Arabidopsis, DWARF3 (D3) in rice, PhMAX2 in petunia and
Summary
A commonly accepted view of plant growth hormones is that their interaction with the cognate receptor protein is reversible, so that each hormone molecule can potentially interact multiple times with a receptor and so either amplify the hormone signal or maintain it over an extended period of time. The receptor is a serine hydrolase-type protein which attacks the strigolactone resulting in covalent modification of the receptor, while at the same time destroying the hormone. The other gene encodes an α/β-fold hydrolase known as D14 in rice, AtD14 in Arabidopsis, DECREASED APICAL DOMINANCE2 (DAD2) in petunia and RMS3 in pea (Brewer et al, 2013; Al-Babili and Bouwmeester, 2015).
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