Auxin binding protein 1 (ABP1) is not required for either auxin signaling or Arabidopsis development

@article{Gao2015AuxinBP,
  title={Auxin binding protein 1 (ABP1) is not required for either auxin signaling or Arabidopsis development},
  author={Yangbin Gao and Yi Zhang and Da Zhang and Xinhua Dai and Mark Estelle and Yunde Zhao},
  journal={Proceedings of the National Academy of Sciences},
  year={2015},
  volume={112},
  pages={2275 - 2280}
}
Significance The plant hormone auxin is a key regulator of plant growth. It has been hypothesized that some auxin responses are mediated by a candidate auxin receptor called auxin binding protein 1 (ABP1). Support for this hypothesis mainly comes from the analyses of Arabidopsis ABP1 knockdown lines generated by cellular immunization or antisense approaches. However, these approaches are subject to off-target effects. As an alternative, we have recovered two new null alleles of abp1… Expand
Developmental roles of Auxin Binding Protein 1 in Arabidopsis thaliana.
TLDR
The gain-of-function analysis suggests a broad, but still mechanistically unclear involvement of ABP1 in plant development, possibly masked in abp1 loss- of-function mutants by a functional redundancy. Expand
Auxin-binding pocket of ABP1 is crucial for its gain-of-function cellular and developmental roles.
TLDR
In planta analyses demonstrated the importance of the auxin binding pocket for all known ABP1-mediated postembryonic developmental processes, including morphology of leaf epidermal cells, root growth and root meristem activity, and vascular tissue differentiation, supporting the role of ABp1 as auxin receptor. Expand
Protoplast Swelling and Hypocotyl Growth Depend on Different Auxin Signaling Pathways1
TLDR
ABP1 seems to be involved in mediating rapid auxIn-induced protoplast swelling, but it is not involved in the control of rapid auxin-induced growth. Expand
Genome Sequencing of Arabidopsis abp1-5 Reveals Second-Site Mutations That May Affect Phenotypes
TLDR
It is found that the abp1-5 line the authors sequenced contains over 8000 single nucleotide polymorphisms in addition to the ABP1 mutation and that at least some of these mutations may originate from the Arabidopsis Wassilewskija accession. Expand
Revisiting Apoplastic Auxin Signaling Mediated by AUXIN BINDING PROTEIN 1
TLDR
ABP1 is a negative regulator of the traditional SCFTIR1/AFB auxin signaling pathway, and the famous abp1-1 and abp-5 mutant Arabidopsis lines are being called into question because of possible additional mutantion sites, making it necessary to reevaluate ABP1. Expand
Strong morphological defects in conditional Arabidopsis abp1 knock-down mutants generated in absence of functional ABP1 protein
TLDR
This data suggests that the phenotypes in abp1 knock-down lines are due to the off-target effects and asks for further reflections on the biological function of ABP1 or alternative explanations for the missing phenotypic defects in the abP1 loss-of-function alleles. Expand
Embryo-lethal phenotypes in early mutants are due to abp 1 disruption of the neighboring gene BSM
The Auxin Binding Protein1 (ABP1) has been identified based on its ability to bind auxin with high affinity and studied for a long time as a prime candidate for the extracellular auxin receptorExpand
Up in the air: Untethered Factors of Auxin Response
TLDR
The function of factors implicated in auxin responses, including S-Phase Kinase-Associated Protein 2A, SMALL AUXIN Up RNAs (SAURs), INDOLE 3-BUTYRIC ACID RESPONSE5 (IBR5), and AUXin BINDING PROTEIN1 (ABP1), has remained largely obscure. Expand
Embryo-lethal phenotypes in early abp1 mutants are due to disruption of the neighboring BSM gene
TLDR
It is shown that there is no hidden copy of the ABP1 gene in the Arabidopsis genome but the embryo-lethal phenotypes of abp1-1 and abp 1-1s alleles are very similar to the knock-out phenotype of the neighboring gene, BELAYA SMERT ( BSM). Expand
Loss of GSNOR1 Function Leads to Compromised Auxin Signaling and Polar Auxin Transport.
TLDR
Impaired auxin signaling and compromised auxin transport are responsible for the auxin-related morphological phenotypes displayed by the gsnor1-3 mutant, and the results suggest that S-nitrosylation and GSNOR1-mediated de-nitROsylation contribute to auxin physiology. Expand
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The AUXIN BINDING PROTEIN 1 Is Required for Differential Auxin Responses Mediating Root Growth
TLDR
The data support that ABP1 is a key regulator for root growth and is required for auxin-mediated responses and differential effects of ABp1 on various auxin responses support a model in which ABP 1 is the major regulator for Auxin action on the cell cycle and regulates auxin -mediated gene expression and cell elongation in addition to the already well known TIR1-mediated ubiquitination pathway. Expand
Auxin-binding protein 1 is a negative regulator of the SCF(TIR1/AFB) pathway.
TLDR
It is found that ABP1 is genetically upstream of TIR1/AFBs;ABP1 knockdown leads to an enhanced degradation of AUX/IAA repressors, independently of its effects on endocytosis, through the SCF(TIR1 /AFB) E3 ubiquitin ligase pathway. Expand
The F-box protein TIR1 is an auxin receptor
TLDR
TIR1 is an auxin receptor that mediates Aux/IAA degradation and auxin-regulated transcription and the loss of TIR1 and three related F-box proteins eliminates saturable auxin binding in plant extracts. Expand
Novel ABP1-TMK auxin sensing system controls ROP GTPase-mediated interdigitated cell expansion in Arabidopsis.
TLDR
It is shown that the plasma membrane-localized TMK receptor-like kinases functionally interact in a complex with ABP1 and are required forABP1-dependent activation of ROP GTPases by auxin, providing convincing evidence for this novel auxin sensing system on the cell surface. Expand
The auxin-binding protein 1 is essential for the control of cell cycle.
TLDR
It is concluded that ABP1 is essential for the Auxin control of cell division and is likely to constitute the first step of the auxin-signalling pathway mediating auxin effects on the cell cycle. Expand
AUXIN-BINDING-PROTEIN1 (ABP1) in phytochrome-B-controlled responses
TLDR
The polar auxin transport inhibitor naphthylphthalamic acid (NPA) decreased elongation in the low R:FR light-enriched white light (WL) condition more strongly than in the high red: FR light- enriched condition WL suggesting that auxin Transport is an important condition for FR-induced elongation. Expand
NPY1, a BTB-NPH3-like protein, plays a critical role in auxin-regulated organogenesis in Arabidopsis
TLDR
These findings put YUCs, PID, and NPY1 into a genetic framework for further dissecting the mechanisms of auxin action in plant development, and suggest that the PID/NPY1 pathway may be regulated by auxin synthesized by the YUC flavin monooxygenases. Expand
Conditional Repression of AUXIN BINDING PROTEIN1 Reveals That It Coordinates Cell Division and Cell Expansion during Postembryonic Shoot Development in Arabidopsis and Tobacco[W]
TLDR
It is shown that decreased ABP1 activity leads to a severe retardation of leaf growth involving an alteration in cell division frequency, an altered pattern of endocycle induction, a decrease in cell expansion, and a change in expression of early auxin responsive genes. Expand
Hormonal interactions in the control of Arabidopsis hypocotyl elongation.
TLDR
The Arabidopsis hypocotyl, together with hormone mutants and chemical inhibitors, was used to study the role of auxin in cell elongation and its possible interactions with ethylene and gibberellin, and results indicate that auxin and gibBerell in are acting independently in hypocotel elongation. Expand
The heterozygous abp1/ABP1 insertional mutant has defects in functions requiring polar auxin transport and in regulation of early auxin-regulated genes.
TLDR
It is hypothesized that ABP1 is involved in the regulation of polar auxin transport, and thus affects local auxin concentration and early auxin gene regulation, and in turn, ABP 1 itself is under the transcriptional control of auxin. Expand
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