A novel negative Fe-deficiency-responsive element and a TGGCA-type-like FeRE control the expression of FTR1 in Chlamydomonas reinhardtii.
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.
Fei
Xiaowen
X
Key Laboratory of Tropical Crop Biotechnology, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou 571101, China.
Eriksson
Mats
M
Li
Yajun
Y
Deng
Xiaodong
X
D001192:Arylsulfatases / Q000378:metabolism; D001483:Base Sequence; D016825:Chlamydomonas reinhardtii / Q000378:metabolism*; D004252:DNA Mutational Analysis; D017353:Gene Deletion; D005786:Gene Expression Regulation; D007501:Iron / Q000737:chemistry*; D035925:Iron-Regulatory Proteins / Q000235:genetics* / Q000378:metabolism*; D008954:Models, Biological; D016296:Mutagenesis; D011401:Promoter Regions, Genetic; D020218:Response Elements; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic
D035925:Iron-Regulatory Proteins; D007501:Iron; D001192:Arylsulfatases