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
中科院分区:
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
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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影响因子:
9.2
作者:
Prigge, Michael J.;Lavy, Meirav;Estelle, Mark
通讯作者:
Estelle, Mark
DOI:
10.1073/pnas.0711146105
发表时间:
2008-04-08
影响因子:
11.1
作者:
Hayashi, Ken-ichiro;Tan, Xu;Nozaki, Hiroshi
通讯作者:
Nozaki, Hiroshi
影响因子:
11.6
作者:
Okushima, Y;Overvoorde, PJ;Theologis, A
通讯作者:
Theologis, A
影响因子:
11.6
作者:
Dreher, KA;Brown, J;Callis, J
通讯作者:
Callis, J
DOI:
10.1073/pnas.0438070100
发表时间:
2003-03-04
影响因子:
11.1
作者:
Alonso, JM;Stepanova, AN;Ecker, JR
通讯作者:
Ecker, JR