AXR1 Antibody

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Description

Definition and Development of AXR1 Antibody

The AXR1 antibody is a polyclonal or monoclonal reagent designed to detect the AXR1 protein, a subunit of the RUB-activating E1 enzyme in Arabidopsis thaliana. AXR1 is essential for conjugating the ubiquitin-like protein RUB1 (Related to Ubiquitin 1) to cullin proteins, a modification critical for SCF (Skp1-Cul1/Cdc53-F-box) E3 ubiquitin ligase activity . The antibody was validated using mutant (axr1) and wild-type plants, confirming specificity through immunoblotting and immunolocalization .

Applications of AXR1 Antibody in Research

The antibody has been instrumental in:

  • Protein Localization: Identifying AXR1 expression in root meristems, floral tissues, and lateral root primordia .

  • Mutant Validation: Distinguishing AXR1 protein levels in axr1 mutants versus wild-type plants .

  • Mechanistic Studies: Investigating AXR1’s role in RUB modification of AtCUL1, which regulates SCF E3 ligases involved in auxin response .

AXR1 in Auxin and Cytokinin Signaling

  • AXR1-ECR1 complexes activate RUB1, enabling RUB-AtCUL1 conjugation. This modification stabilizes SCFTIR1 complexes necessary for auxin-mediated degradation of Aux/IAA repressors .

  • AXR1 promotes cytokinin response by facilitating proteolysis of type-A ARR5 feedback regulators, a process dependent on RUB-modified cullins .

Role in DNA Repair and Meiosis

  • AXR1 ensures proper chiasma formation during meiosis and supports homologous recombination (HR) in DNA repair. Mutants exhibit altered crossover distribution and reduced seed viability .

  • AXR1 deficiency increases telomeric crossover rates while reducing centromere-proximal recombination, linked to disrupted telomere bouquet dynamics .

Epigenetic Regulation

  • axr1 mutants show hypermethylation of transposable elements (TEs) in pericentromeric regions, independent of its role in crossover regulation. This suggests AXR1 influences DNA methylation via cullin-RUB pathways .

AXR1 Antibody Characterization

The table below summarizes validation data for the AXR1 antibody:

ParameterDetails
Target ProteinAXR1 (Uniprot ID: P42744; AGI: At1g05180)
Molecular Weight~60 kDa
Validation MethodsWestern blotting, immunolocalization, mutant comparison
ApplicationsProtein expression analysis, mechanistic studies in auxin signaling

Biological Roles of AXR1 Protein

The table below highlights AXR1’s functional diversity:

ProcessRole of AXR1References
Auxin SignalingActivates RUB1 for AtCUL1 modification, enabling SCFTIR1-mediated auxin response
Cytokinin ResponseFacilitates ARR5 degradation via RUB-dependent ubiquitination
Meiotic RecombinationEnsures crossover formation and proper chromosome segregation
DNA RepairSupports homologous recombination repair of double-strand breaks
DNA MethylationIndirectly regulates TE methylation through cullin-RUB pathways

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Made-to-order (14-16 weeks)
Synonyms
AXR1 antibody; At1g05180 antibody; YUP8H12.21 antibody; NEDD8-activating enzyme E1 regulatory subunit AXR1 antibody; Auxin-resistance protein AXR1 antibody; Protein AUXIN-RESISTANT 1 antibody
Target Names
AXR1
Uniprot No.

Target Background

Function
AXR1 Antibody targets the regulatory subunit of the dimeric ECR1-AXR1 E1 enzyme. This enzyme plays a crucial role in the activation of RUB1/NEDD8, a ubiquitin-like protein, by first adenylating its C-terminal glycine residue with ATP. Subsequently, this residue is linked to the side chain of the catalytic cysteine, resulting in the formation of a RUB1-ECR1 thioester and free AMP. Finally, E1 transfers RUB1 to the catalytic cysteine of RCE1. AXR1 has been implicated in various cellular processes including auxin response, regulation of meiotic recombination, and E3-mediated protein degradation in response to specific stimuli. Specifically, it regulates the chromosomal localization of meiotic recombination by crossovers (COs) and subsequent synapsis, likely through the activation of a CRL4 complex. It is also involved in E3-mediated protein degradation in response to auxin, jasmonic acid, and cold stress. Moreover, AXR1 is essential for the COP1-COP10-CSN-mediated repression of photomorphogenesis in the dark. While it may function redundantly with AXL1 in the RUB conjugating pathway, AXR1 appears not to be functionally equivalent to AXL1 in vivo.
Gene References Into Functions
  1. Studies have shown that AXR1 and other neddylation enzymes undergo autoneddylation in an E2- and E3-independent manner in vitro. Furthermore, AXR1 autoneddylation has been observed to impair NEDD8 E2 approximately thioester formation in the den1 mutant background in vivo. PMID: 28096463
  2. SMAP1 has been identified as a crucial factor for root meristem formation and normal embryo development in the axr1 background. PMID: 22576848
  3. Research findings demonstrate that root hair cell-specific overexpression of the influx transporter AUXIN-RESISTANT1 enhances root hair length. PMID: 18156217
Database Links

KEGG: ath:AT1G05180

STRING: 3702.AT1G05180.1

UniGene: At.10217

Protein Families
Ubiquitin-activating E1 family, ULA1 subfamily
Subcellular Location
Nucleus.
Tissue Specificity
Expressed in shoot, root and floral meristems, in vascular tissues of cotyledons and mature leaves, and in the stele of the root. Expressed at higher levels on the lower side of an emerging root during germination and at higher levels on the underside of

Q&A

Experimental Design for Antibody Validation

  • Question: How do I validate an antibody for use in my research, especially when working with different species or experimental setups?

  • Answer: Validation involves confirming the specificity and sensitivity of the antibody in your specific experimental conditions. This can be achieved by comparing results between wild-type and knockout/knockdown samples, using multiple antibodies targeting different epitopes, or employing orthogonal methods like Western blot and immunofluorescence .

Antibody Selection for Cross-Species Reactivity

  • Question: What factors should I consider when selecting an antibody for cross-species reactivity, and how can I ensure its effectiveness across different species?

  • Answer: Consider the sequence homology between the target proteins across species. Use databases to assess the similarity of the antigenic regions. Validate the antibody in each species using techniques like ELISA or Western blot to confirm cross-reactivity .

Addressing Batch-to-Batch Variability

  • Question: How can I mitigate batch-to-batch variability in antibodies, and what information should I report to ensure reproducibility?

  • Answer: Report the batch number and dilution used. Perform initial validation with each new batch. Consider using monoclonal antibodies, which tend to be more consistent than polyclonal ones. Document any observed variability and adjust experimental conditions as needed .

Data Analysis and Contradiction Resolution

  • Question: If my results contradict previous findings using the same antibody, what steps can I take to resolve these discrepancies?

  • Answer: Re-evaluate experimental conditions, including antibody concentration, fixation methods, and detection systems. Consider using alternative antibodies or orthogonal methods to validate findings. Consult literature for similar discrepancies and potential explanations .

Advanced Techniques for Antibody Characterization

  • Question: What advanced techniques can I use to further characterize and optimize my antibody for specific applications?

  • Answer: Techniques like surface plasmon resonance can help determine antibody affinity. For therapeutic applications, consider conjugating antibodies with drugs or radioactive isotopes for targeted delivery. Use bioinformatics tools to predict potential off-target effects .

Reporting Guidelines for Antibody Use

  • Question: What details should I include when reporting antibody use in my research to enhance transparency and reproducibility?

  • Answer: Include the antibody name, supplier, catalog number, batch number, dilution, and validation methods used. Specify the experimental setup and species tested. Follow journal guidelines for antibody reporting to ensure comprehensive documentation .

Troubleshooting Common Issues with Antibodies

  • Question: How can I troubleshoot common issues like non-specific binding or lack of signal when using antibodies?

  • Answer: Adjust antibody concentrations, optimize fixation and permeabilization protocols, and use blocking agents to reduce non-specific binding. Consider using secondary antibodies with different fluorophores or detection methods to enhance signal .

Future Directions in Antibody Research

  • Question: What are some emerging trends or technologies in antibody research that could enhance my current studies?

  • Answer: Single-domain antibodies (sdAbs) offer advantages in terms of size and stability, making them suitable for imaging and therapeutic applications. Advances in antibody engineering, such as affinity maturation and bispecific antibodies, can improve specificity and efficacy .

Ethical Considerations in Antibody Research

  • Question: What ethical considerations should I keep in mind when conducting antibody research, especially in therapeutic contexts?

  • Answer: Ensure compliance with regulatory guidelines for animal and human studies. Consider the potential impact on human health and the environment. Maintain transparency in reporting methods and results to facilitate ethical review and public trust .

Collaboration and Resource Sharing

  • Question: How can I collaborate with other researchers or share resources to advance antibody research and address common challenges?

  • Answer: Participate in scientific forums and conferences to share experiences and best practices. Collaborate on validation studies or share antibody batches to reduce variability. Utilize open-access databases and repositories for antibody information to enhance community knowledge .

Example Data Table for Antibody Validation

AntibodySpeciesValidation MethodDilutionBatch Number
AXR1MouseWestern Blot1:1000AB123456
AXR1HumanImmunofluorescence1:500CD789012

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