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EIN3 interferes with the sulfur deficiency signaling in Arabidopsis thaliana through direct interaction with the SLIM1 transcription factor.

Plant Sci. 2016 Dec;253:50-57. Epub 2016 Sep 16
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摘要


Sulfur deficiency in plants leads to metabolic reprogramming through changes of gene expression. SLIM1 is so far the only characterized transcription factor associated strictly with sulfur deficiency stress in Arabidopsis thaliana. It belongs to the same protein family as EIN3, a major positive switch of ethylene signaling pathway. It binds to the specific cis sequence called UPE-box. Here we show that SLIM1 interacts with UPE-box as a homodimer. Interestingly, the same region of the protein is used for heterodimerization with EIN3; however, the heterodimer is not able to recognize UPE-box. Expression of several SLIM1-dependent genes is enhanced in sulfur deficiency grown Arabidopsis ein3-1 seedlings (with mutated EIN3 protein). This implies a possible regulatory mechanism of ethylene in sulfur metabolism through direct EIN3-SLIM1 interaction.

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