A combinatorial TIR1/AFB-Aux/IAA co-receptor system for differential sensing of auxin.

A combinatorial TIR1/AFB-Aux/IAA co-receptor system for differential sensing of auxin.
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DOI:
10.1038/nchembio.926
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发表时间:
2012-04-01
影响因子:
14.8
通讯作者:
Estelle, Mark
Estelle, Mark
中科院分区:
生物学1区
文献类型:
--
作者:
Calderon Villalobos, Luz Irina A.;Lee, Sarah;De Oliveira, Cesar;Ivetac, Anthony;Brandt, Wolfgang;Armitage, Lynne;Sheard, Laura B.;Tan, Xu;Parry, Geraint;Mao, Haibin;Zheng, Ning;Napier, Richard;Kepinski, Stefan;Estelle, Mark

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植物激素生长素几乎调节植物生长和发育的各个方面。生长素通过与F-box蛋白质TIR 1结合起作用,并促进Aux/IAA转录抑制因子的降解。在这里,我们表明,有效的生长素结合需要组装的生长素共受体复合物组成的TIR 1和Aux/IAA蛋白。酵母中的异源性实验和使用纯化蛋白质的定量IAA结合测定表明,TIR 1和Aux/IAA蛋白质的不同组合形成具有广泛的生长素结合亲和力的共受体复合物。生长素亲和力似乎在很大程度上由Aux/IAA决定。由于拟南芥中存在6个TIR 1/AFB和29个Aux/IAA蛋白,组合相互作用可能导致许多具有不同生长素传感特性的共受体。我们还证明了AFB 5-Aux/IAA共受体选择性地结合植物生长素除草剂氨氯吡啶酸。这种共受体系统拓宽了激素的有效浓度范围,并可能有助于生长素反应的复杂性。
The plant hormone auxin regulates virtually every aspect of plant growth and development. Auxin acts by binding to the F-box protein TIR1 and promotes the degradation of the Aux/IAA transcriptional repressors. Here, we show that efficient auxin binding requires assembly of an auxin co-receptor complex consisting of TIR1 and an Aux/IAA protein. Heterologous experiments in yeast and quantitative IAA binding assays using purified proteins showed that different combinations of TIR1 and Aux/IAA proteins form co-receptor complexes with a wide range of auxin-binding affinities. Auxin affinity appears to be largely determined by the Aux/IAA. As there are 6 TIR1/AFBs and 29 Aux/IAA proteins in Arabidopsis thaliana, combinatorial interactions may result in many co-receptors with distinct auxin sensing properties. We also demonstrate that the AFB5-Aux/IAA co-receptor selectively binds the auxinic herbicide picloram. This co-receptor system broadens the effective concentration range of the hormone and may contribute to the complexity of auxin response.
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