title: ATBS1 INTERACTING FACTORs negatively regulate Arabidopsis cell elongation in the triantagonistic bHLH system.
abstract: We recently demonstrated that cell elongation in plants is regulated by a triantagonistic bHLH system, in which three bHLH proteins, Activator of Cell Elongation 1 (ACE1), Arabidopsis ILI1 binding BHLH 1 (AtIBH1) and Paclobutrazol Resistance 1 (PRE1), competitively regulate the expression of genes for cell elongation. Here we show that ATBS1 Interacting Factor 2 (AIF2), AIF3 and AIF4 interact with PRE1 and ACE1, similar to AtIBH1, and also negatively regulate cell elongation in the triantagonistic bHLH system. The expression of each AIF is constitutive or induced by light, but AtIBH1 expression is dependent on BR signaling and developmental phase. These results indicate that AIFs and AtIBH1 may play different roles in cell elongation in different signaling pathways.
authors: Bioproduction Research Institute; National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba, Japan; Japanese Society for the Promotion of Science (JSPS); Tokyo, Japan.
authors: Miho
authors: M
authors: Ikeda
authors: Nobutaka
authors: N
authors: Mitsuda
authors: Masaru
authors: M
authors: Ohme-Takagi
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000166:cytology / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism; D051792:Basic Helix-Loop-Helix Proteins / Q000235:genetics* / Q000378:metabolism; D060406:Brassinosteroids / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D008969:Molecular Sequence Data; D059828:Plant Cells / Q000378:metabolism; D063245:Plant Development / Q000235:genetics*; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D051792:Basic Helix-Loop-Helix Proteins; D060406:Brassinosteroids; D014157:Transcription Factors; C513126:PRE1 protein, Arabidopsis
keywords: antagonistic; atypical HLH; bHLH; brassinosteroid; cell elongation