title: Auxin binding protein 1 (ABP1) is not required for either auxin signaling or Arabidopsis development.
abstract: Auxin binding protein 1 (ABP1) has been studied for decades. It has been suggested that ABP1 functions as an auxin receptor and has an essential role in many developmental processes. Here we present our unexpected findings that ABP1 is neither required for auxin signaling nor necessary for plant development under normal growth conditions. We used our ribozyme-based CRISPR technology to generate an Arabidopsis abp1 mutant that contains a 5-bp deletion in the first exon of ABP1, which resulted in a frameshift and introduction of early stop codons. We also identified a T-DNA insertion abp1 allele that harbors a T-DNA insertion located 27 bp downstream of the ATG start codon in the first exon. We show that the two new abp1 mutants are null alleles. Surprisingly, our new abp1 mutant plants do not display any obvious developmental defects. In fact, the mutant plants are indistinguishable from wild-type plants at every developmental stage analyzed. Furthermore, the abp1 plants are not resistant to exogenous auxin. At the molecular level, we find that the induction of known auxin-regulated genes is similar in both wild-type and abp1 plants in response to auxin treatments. We conclude that ABP1 is not a key component in auxin signaling or Arabidopsis development.
authors: Section of Cell and Developmental Biology and.
authors: Yangbin
authors: Y
authors: Gao
authors: Section of Cell and Developmental Biology and Howard Hughes Medical Institute, University of California, San Diego, La Jolla, CA 92093-0116; and.
authors: Yi
authors: Y
authors: Zhang
authors: Section of Cell and Developmental Biology and College of Life Science, Northeast Agricultural University, Harbin 150030, China.
authors: Da
authors: D
authors: Zhang
authors: Section of Cell and Developmental Biology and.
authors: Xinhua
authors: X
authors: Dai
authors: Section of Cell and Developmental Biology and Howard Hughes Medical Institute, University of California, San Diego, La Jolla, CA 92093-0116; and mestelle@ucsd.edu yundezhao@ucsd.edu.
authors: Mark
authors: M
authors: Estelle
authors: Section of Cell and Developmental Biology and mestelle@ucsd.edu yundezhao@ucsd.edu.
authors: Yunde
authors: Y
authors: Zhao
mesh_terms: D017360:Arabidopsis / Q000254:growth & development / Q000378:metabolism*; D017343:Genes, Plant; D007210:Indoleacetic Acids / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000502:physiology*; D011956:Receptors, Cell Surface / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction
chemical_list: D007210:Indoleacetic Acids; D010940:Plant Proteins; D011956:Receptors, Cell Surface; C083846:auxin-binding protein 1
keywords: ABP1; CRISPR; auxin; plant development; receptor
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