PILS3 Antibody
Description
Overview of PILS3 Antibody
PILS3 (PIN-LIKES 3) antibodies are specialized immunoglobulins designed to detect and study the PILS3 protein, a member of the PIN-LIKES (PILS) family involved in intracellular auxin homeostasis and signaling in plants. These antibodies enable researchers to investigate PILS3's subcellular localization, expression patterns, and regulatory roles in plant growth and development.
Biological Context of PILS3 Protein
PILS3 is an endoplasmic reticulum (ER)-localized auxin transporter that regulates nuclear auxin availability by sequestering auxin in the ER. This modulates auxin signaling dynamics, impacting processes such as apical hook development, root growth, and light-responsive morphogenesis .
Key Features of PILS3:
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Function: Reduces nuclear auxin signaling by restricting auxin efflux from the ER .
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Regulation: Transcriptional repression by brassinosteroid (BR) signaling via BZR1 transcription factors .
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Genetic Redundancy: Works redundantly with PILS2 and PILS5 in auxin-mediated developmental processes .
Research Applications of PILS3 Antibodies
PILS3 antibodies are critical tools for:
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Immunolocalization: Tracking PILS3 protein distribution in plant tissues (e.g., root meristems, apical hooks) .
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Western Blotting: Quantifying PILS3 expression levels in transgenic Arabidopsis lines (e.g., pils3 mutants or PILS3-GFP overexpressors) .
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Functional Studies: Assessing interactions with regulatory proteins like E3 ubiquitin ligases (e.g., GASP1) and proteasomal degradation pathways .
Table 1: Key Research Insights on PILS3
Technical Considerations for PILS3 Antibodies
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Cross-Reactivity: Antibodies may target epitopes in conserved regions of PILS proteins, necessitating validation in genetic mutants (e.g., pils3-1) .
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Protein Stability: PILS3 abundance is influenced by proteasomal inhibitors (e.g., MG132), requiring controlled experimental conditions .
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Functional Redundancy: Co-analysis with PILS2/PILS5 antibodies is recommended due to overlapping roles in auxin regulation .
Challenges and Future Directions
While PILS3 antibodies have advanced plant hormone research, limitations include:
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Specificity: Distinguishing PILS3 from homologous PILS family members (e.g., PILS2, PILS5).
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Dynamic Regulation: Capturing transient changes in PILS3 localization during rapid auxin signaling events. Future studies may employ CRISPR-based tagging or nanobody technologies to improve resolution.
Product Specs
Constituents: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Target Background
PILS3 belongs to the PIN-LIKES (PILS) protein family. These proteins are putative auxin transporters localized to the endoplasmic reticulum. (PMID: 22504182)
Q&A
Here’s a structured collection of FAQs tailored for researchers working with PILS3 antibodies, integrating methodological guidance and data-driven insights from scientific literature:
How do I validate the specificity of a PILS3 antibody in plant tissue samples?
Methodological Answer:
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Western Blot: Use knockout mutants (e.g., pils3-1 Arabidopsis lines) as negative controls. Compare band patterns between wild-type and mutant lysates. A 55 kDa band (expected MW: ~30 kDa with possible post-translational modifications) should be absent in mutants .
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Immunofluorescence (IF): Combine with GFP-tagged PILS3 lines (pPILS3:PILS3-GFP) to confirm subcellular localization. Use DyLight®488 secondary antibodies and counterstain with DAPI for nuclear reference .
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Cross-Reactivity Check: Test antibody reactivity against homologs (e.g., PILS2/PILS5) using lysates from pils2 pils5 double mutants to rule out off-target binding .
What experimental conditions optimize PILS3 antibody performance in Arabidopsis apical hook assays?
Protocol Recommendations:
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Tissue Fixation: Use formaldehyde-based fixation to preserve apical hook morphology during sectioning .
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Antigen Retrieval: Treat sections with IHC enzyme antigen retrieval reagent (e.g., AR0022) for 15 minutes to enhance epitope accessibility .
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Blocking: Incubate with 10% goat serum to reduce nonspecific binding .
How do I resolve contradictions in PILS3 antibody signal between Western blot and phenotypic data?
Troubleshooting Framework:
What strategies mitigate polyreactivity of PILS3 antibodies in complex plant lysates?
Advanced Validation:
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Baculovirus Binding Assay: Screen for nonspecific interactions using insect cell lysates .
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Charge Imbalance Analysis: Test heparin/DNA binding via ELISA; high affinity suggests polyreactivity driven by electrostatic interactions .
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In Vivo Clearance Study: Inject antibody into pils3 mutants and monitor pharmacokinetics. Rapid clearance indicates off-target binding .
How do I reconcile conflicting subcellular localization data for PILS3 across studies?
Unified Workflow:
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Standardize Fixation: Compare formaldehyde vs. glutaraldehyde fixation effects on membrane protein preservation .
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Quantitative Imaging: Use fluorescence intensity profiling in apical hook cells to distinguish nuclear vs. cytoplasmic signals .
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Orthogonal Validation: Correlate IF results with BiFC (Bimolecular Fluorescence Complementation) assays using split-YFP tagged PILS3 .
Key Validation Data Table
Adapted from PLD3 antibody validation :
| Assay | Conditions | Expected Result |
|---|---|---|
| Western Blot | 5-20% SDS-PAGE, 30 µg lysate, anti-PILS3 (1:500) | 55 kDa band in wild-type, absent in pils3 mutants |
| Immunofluorescence | 5 µg/mL primary antibody, DyLight®488 secondary (1:100) | Membrane/cytoplasmic signal in apical hook cells |
| Cross-Reactivity | Lysates from pils2 pils5 mutants | No signal in double mutants |
