nup146 Antibody

What is Nup146 and what role does it play in the nuclear pore complex?

Nup146 would be classified as a nucleoporin that contributes to the structure and function of the nuclear pore complex (NPC). NPCs are among the largest supramolecular structures in eukaryotic cells, composed of approximately 30 different nucleoporins (Nups) that typically appear in multiple copies (8, 16, or 32) per NPC . These complexes perforate the nuclear envelope and regulate the exchange of macromolecules between the nucleus and cytoplasm. Like other nucleoporins, Nup146 would be expected to participate in the highly organized octagonal ring-scaffold structure that features eight-fold rotational symmetry .

How are nucleoporin antibodies typically generated?

Nucleoporin antibodies are typically generated using synthetic polypeptides derived from specific regions of the target nucleoporin as antigens. For example, researchers have successfully generated monoclonal antibodies against Nup98 by using two synthetic polypeptides derived from the macronuclear Nup98 of Tetrahymena thermophila . These antibodies are selected through positive screening with ELISA and validated with indirect immunofluorescence staining . For a Nup146 antibody, researchers would likely design synthetic peptides corresponding to unique or conserved regions of the Nup146 protein sequence.

What epitopes do nucleoporin antibodies typically recognize?

Nucleoporin antibodies often recognize conserved amino acid sequences that appear repetitively in these proteins. For instance, monoclonal antibodies 13C2 and 21A10 recognize the Gly-Leu-Phe-Gly (GLFG) repeat sequence in the N-terminal region of Nup98 . Specifically, the epitope recognized by 13C2 is FGxxN (where x represents any amino acid), and the epitope recognized by 21A10 is GLF . These epitopes can be well-conserved among nucleoporins from different species, making some antibodies useful across phylogenetically distinct organisms including humans, yeasts, and ciliates .

What experimental techniques can Nup146 antibody be used for?

Based on applications of other nucleoporin antibodies, a Nup146 antibody would likely be suitable for:

• Indirect immunofluorescence (IF) staining to visualize nuclear pore distribution

• Western blot analysis for protein expression studies

• Super-resolution microscopy techniques such as STORM (Stochastic Optical Reconstruction Microscopy) for detailed structural analysis

• Single-molecule microscopy for quantitative studies of nucleoporin stoichiometry

• Co-immunoprecipitation to identify protein interaction partners

How should immunofluorescence protocols be optimized for Nup146 antibody?

While protocols would need to be optimized specifically for Nup146 antibody, the following approach has proven effective for other nucleoporin antibodies:

• Fix samples appropriately (fixation method depends on cell type and target accessibility)

• Block with 1% BSA for 2 hours at room temperature

• Dilute primary antibody to approximately 0.5 μg/mL in PBS

• Incubate blocked samples with primary antibody solution overnight at 4°C

• Use appropriate secondary antibodies (e.g., Alexa 488-labeled anti-mouse IgG at 4 μg/mL)

• Counterstain DNA with DAPI

• Wash samples three times with PBS between treatments

For optimal results, antibody concentration and incubation times should be empirically determined for each specific application and cell type.

What advanced microscopy techniques are most effective with nucleoporin antibodies?

Super-resolution microscopy techniques, particularly STORM imaging, have proven highly effective for nucleoporin studies. STORM provides significantly improved resolution compared to conventional epifluorescence microscopy. For example, STORM imaging with MAB414 (which recognizes several FG-repeat nucleoporins) shows distinct dot-like clusters on nuclear surfaces that appear as blurry signals in conventional microscopy . Similarly, STORM imaging with NUP133 antibody clearly resolves the ring-like structure of individual NPCs that cannot be visualized with standard techniques . Single-molecule SPEED microscopy has also been successfully used to count individual nucleoporin molecules within NPCs .

How can antibodies be used to quantify nucleoporin stoichiometry in NPCs?

Single-molecule SPEED microscopy combined with appropriate antibodies allows direct counting of nucleoporin copy numbers within individual NPCs. This approach has been used to count twenty-four different Nups in live yeast cells . The technique revealed that while some nucleoporins appear in the expected 8 or 16 copies per NPC, others show unexpected stoichiometry. For example, Nsp1 and Nic96 were found to have a maximum of 16 copies rather than the previously estimated 32 copies, and several other Nups were present in only 10-15 copies rather than the expected 8 or 16 . Similar approaches could be applied with Nup146 antibody to determine its precise stoichiometry within the NPC.

What computational methods are recommended for analyzing super-resolution microscopy data of nucleoporins?

Unsupervised learning-based clustering analysis methods such as HDBSCAN (Hierarchical Density-Based Spatial Clustering of Applications with Noise) have been successfully applied to extract individual NPC data from STORM images . The minimal number of points per cluster for HDBSCAN should be optimized using Monte Carlo simulation . These computational approaches allow quantification of:

• Number of nucleoporin clusters

• Single-molecule localization (SML) density

• Number of SMLs in each NPC cluster

• NPC cluster sizes

When comparing different cellular states or conditions, these quantitative parameters can reveal subtle changes in NPC composition or organization that might not be apparent with conventional imaging.

How can nucleoporin antibodies be used for cross-species studies?

Some nucleoporin antibodies recognize epitopes that are conserved across phylogenetically distinct organisms. For example, monoclonal antibodies 13C2 and 21A10, which were raised against Tetrahymena thermophila Nup98, also recognize Nup98 homologs in human cells and yeasts (Schizosaccharomyces pombe and Saccharomyces cerevisiae) . This cross-reactivity makes these antibodies valuable for comparative studies across species. When developing or selecting a Nup146 antibody, researchers should consider targeting conserved domains if cross-species reactivity is desired, or species-specific regions if selectivity is required.

How should researchers interpret different staining patterns observed with nucleoporin antibodies?

Different staining patterns can provide valuable information about nucleoporin distribution and function. For example, in Tetrahymena thermophila, MAb 13C2 showed high specificity for the macronucleus, while MAb 21A10 stained both the macronuclear and micronuclear periphery . These differences indicate that the antibodies recognize different sets of nucleoporins, with 21A10 detecting Nups that localize to both nuclear types. When encountering unexpected staining patterns with Nup146 antibody, researchers should:

• Verify antibody specificity using Western blot or knockdown controls

• Consider potential post-translational modifications that might affect epitope accessibility

• Examine whether the staining pattern changes under different cellular conditions

• Compare results with other nucleoporin antibodies to identify patterns of co-localization

What controls are essential when working with Nup146 antibody?

When working with any nucleoporin antibody, including Nup146, the following controls are essential:

• Negative controls:

  • No primary antibody control

  • Isotype control (primary antibody of same isotype but irrelevant specificity)

  • Peptide competition assay (pre-incubation of antibody with immunizing peptide)

• Positive controls:

  • Samples known to express the target protein

  • Comparison with other validated antibodies against the same target

• Validation controls:

  • siRNA/shRNA knockdown of target protein

  • CRISPR/Cas9 knockout verification

  • Recombinant protein expression

• Multiple detection methods:

  • Use of multiple antibodies targeting different epitopes

  • Correlation with fluorescently tagged protein expression

How can researchers analyze contradictory results obtained from different nucleoporin antibodies?

When faced with contradictory results from different antibodies targeting the same nucleoporin:

• Evaluate antibody specificity through Western blot analysis and knockdown controls

• Consider epitope accessibility under different experimental conditions (fixation methods, detergents, etc.)

• Examine whether antibodies recognize different isoforms or modified forms of the target

• Use orthogonal techniques (e.g., mass spectrometry) to validate findings

• Employ super-resolution microscopy to resolve potential spatial differences in epitope distribution

• Use quantitative analysis of multiple independent experiments to assess statistical significance of observed differences

How are nucleoporin antibodies contributing to our understanding of disease mechanisms?

Nucleoporin antibodies are valuable tools for studying disease-relevant processes. For example, antibodies against Nup98 can be used to investigate NUP98-related hematopoietic malignancies . Research has shown that nucleoporin dysregulation affects cellular differentiation pathways. For instance, NUP93 knockdown in keratinocytes leads to upregulation of differentiation genes related to keratinization and innate immunity, along with nuclear enrichment of NF-κB transcription factors . Similar approaches with Nup146 antibody could reveal its potential involvement in disease mechanisms through alterations in nucleocytoplasmic transport or gene expression regulation.

How can researchers study the role of nucleoporins in transcriptional regulation?

Nucleoporins like Nup98 have multifunctional roles in nuclear processes including transcriptional regulation . To study these functions:

• Combine chromatin immunoprecipitation (ChIP) with nucleoporin antibodies to identify genomic binding sites

• Use RNA-seq following nucleoporin knockdown to identify regulated genes

• Employ proximity ligation assays to detect interactions with transcription factors

• Analyze nucleoporin localization during different transcriptional states

• Correlate nucleoporin binding with chromatin states and gene expression levels

For example, researchers found that NUP93 knockdown affected NF-κB transcription factor localization and activity, demonstrating nucleoporins' role in regulating specific transcriptional programs .

What are the latest methodological advances in nucleoporin antibody applications?

Recent methodological advances include:

• Super-resolution microscopy techniques like STORM that resolve individual nuclear pore complexes

• Single-molecule counting approaches that determine exact stoichiometry of nucleoporins

• Quantitative image analysis using machine learning algorithms such as HDBSCAN

• Live-cell imaging with antibody fragments or nanobodies

• Correlative light and electron microscopy (CLEM) for structural-functional studies

• Proximity labeling approaches (BioID, APEX) to identify context-specific interaction partners

These techniques extend beyond traditional applications like Western blotting and immunofluorescence, enabling researchers to address more sophisticated questions about nucleoporin dynamics and functions.