title: Characterization of the AtSPX3 Promoter Elucidates its Complex Regulation in Response to Phosphorus Deficiency.
abstract: AtSPX3, responding to phosphate (Pi) deficiency by its expression, is an important gene involved in Pi homeostasis in Arabidopsis. To understand its transcriptional regulation, we characterized the AtSPX3 promoter by distal truncation, internal deletion and mutation of the predicted cis-elements, and identified multiple cis-elements responsive to Pi status. The P1BS (AtPHR-binding site) and AtMyb4 (putative MYB4-binding site) elements were two main cis-elements in the AtSPX3 promoter. P1BS is essential and has a dosage effect for activating expression of the gene under Pi deficiency, while the element AtMyb4 possesses a dual function: one is to enhance AtSPX3 expression in roots under Pi deficiency, and the other one is to repress AtSPX3 expression in shoots under both Pi deficiency and sufficiency. Moreover, we confirmed that AtPHR1, a key transcription factor in Pi homeostasis of plants, was required for the negative regulation function of the AtMyb4 element in shoots. Additionally, we also found that the AtSPX3 promoter had a length limitation for activating gene expression. Generally, our findings in this work are useful for understanding the molecular regulation mechanism of genes involved in Pi uptake and homeostasis.
authors.affiliation: The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Li
authors.affiliation: The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Huilan
authors.initials: H
authors.lastname: Wu
authors.affiliation: The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Huajie
authors.initials: H
authors.lastname: Fan
authors.affiliation: The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhao
authors.affiliation: The State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China hqling@genetics.ac.cn.
authors.forename: Hong-Qing
authors.initials: HQ
authors.lastname: Ling
mesh_terms: D017360:Arabidopsis / Q000166:cytology / Q000235:genetics* / Q000502:physiology; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D001483:Base Sequence; D001665:Binding Sites; D018506:Gene Expression Regulation, Plant; D017930:Genes, Reporter; D006706:Homeostasis; D010710:Phosphates / Q000172:deficiency / Q000378:metabolism; D010758:Phosphorus / Q000172:deficiency* / Q000378:metabolism; D018517:Plant Roots / Q000166:cytology / Q000235:genetics / Q000502:physiology; D018520:Plant Shoots / Q000166:cytology / Q000235:genetics / Q000502:physiology; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic / Q000235:genetics*; D036226:Seedlings / Q000166:cytology / Q000235:genetics / Q000502:physiology; D017384:Sequence Deletion; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; C514695:PHR1 protein, Arabidopsis; D010710:Phosphates; D014157:Transcription Factors; D010758:Phosphorus
keywords: Arabidopsis; AtMyb4; AtSPX3 promoter; P1BS; Phosphate; cis-element