A novel negative Fe-deficiency-responsive element and a TGGCA-type-like FeRE control the expression of FTR1 in Chlamydomonas reinhardtii.

A novel negative Fe-deficiency-responsive element and a TGGCA-type-like FeRE control the expression of FTR1 in Chlamydomonas reinhardtii.
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DOI:
10.1155/2010/790247
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发表时间:
2010
影响因子:
--
通讯作者:
Deng X
Deng X
中科院分区:
其他
文献类型:
--
作者:
Fei X;Eriksson M;Li Y;Deng X

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我们已经报道了三个铁缺乏反应元件(FEREs),FOX 1,ATX 1和FEA 1,所有这些都是响应于莱茵衣藻缺铁的正调控元件。在这里,我们描述了FTR 1,另一个铁调控基因及其启动子的突变分析。我们的研究结果表明,FTR 1的FeREs区别于其他铁反应元件,包含负和正调控区。在FTR 1中,转录起始位点的−291/−236区域对于铁缺乏诱导表达是必要的和足够的。该区域包含两个具有TGGCA样核心序列的阳性FeRE:位于−287/−279的FtrFeRE 1(ATGCAGGCT)和位于−253/−236的FtrFeRE 2(AAGCGATTGCCAGAGCGC)。此外,我们发现了一种新的FERE,FtrFeRE 3(AGTAACTGTTAAGCC),位于−319/−292,对FTR 1的表达产生负面影响。
We have reported three Fe-deficiency-responsive elements (FEREs), FOX1, ATX1, and FEA1, all of which are positive regulatory elements in response to iron deficiency in Chlamydomonas reinhardtii. Here we describe FTR1, another iron regulated gene and mutational analysis of its promoter. Our results reveal that the FeREs of FTR1 distinguish itself from other iron response elements by containing both negative and positive regulatory regions. In FTR1, the −291/−236 region from the transcriptional start site is necessary and sufficient for Fe-deficiency-inducible expression. This region contains two positive FeREs with a TGGCA-like core sequence: the FtrFeRE1 (ATGCAGGCT) at −287/−279 and the FtrFeRE2 (AAGCGATTGCCAGAGCGC) at −253/−236. Furthermore, we identified a novel FERE, FtrFeRE3 (AGTAACTGTTAAGCC) localized at −319/−292, which negatively influences the expression of FTR1.
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