mug98 Antibody
Description
CD98 Biology and Therapeutic Relevance
CD98 (SLC3A2) forms heterodimers with light chains (CD98lc) to create amino acid transporters critical for:
| Property | Detail |
|---|---|
| Gene | SLC3A2 (Chromosome 11q12.3) |
| Protein Structure | Heavy chain (85 kDa) + light chain (40 kDa) |
| Expression | Upregulated in 80% of cancers vs. normal tissues |
R8H283 (Anti-CD98hc)
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Target: CD98hc in CD98 heterodimers
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Mechanism:
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Preclinical Efficacy:
NPB15 (Anti-CD98)
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Applications:
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Biomarker Potential:
Marker CD98-High Cells CD98-Low Cells Clonogenicity 85% survival 22% survival Tumorosphere 3.5-fold larger Baseline
Comparative Analysis of Anti-CD98 Agents
Challenges in CD98 Antibody Development
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Glycoform Sensitivity: Normal vs. cancer CD98 exhibit distinct glycosylation patterns affecting antibody binding
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Safety Profile: No cytotoxicity to PBMCs at ≤100 μg/mL in vitro
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Manufacturing: Humanization improves PK (t₁/₂ = 14 days vs. 2 days for murine analogs)
Future Directions
Product Specs
Composition: 50% Glycerol, 0.01M Phosphate Buffered Saline (PBS), pH 7.4
Target Background
KEGG: spo:SPBC15D4.12c
Q&A
How is mug98 antibody specificity validated in fission yeast studies?
Specificity validation requires a multi-step approach:
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Knockout Strains: Compare WB signals between wild-type and mug98 gene knockout strains. The absence of bands in knockout lysates confirms target specificity .
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Immunogen Reactivity: Use recombinant mug98 protein (UniProt O74317) in ELISA to verify antibody-antigen binding. A 10-fold higher signal in spiked samples versus controls indicates minimal cross-reactivity .
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Cross-Species Testing: Assess reactivity against Saccharomyces cerevisiae and human cell lysates. Studies show mug98 antibody exhibits ≤5% cross-reactivity with non-target species .
Table 1: Validation Parameters for mug98 Antibody
| Parameter | Wild-Type Lysate | Knockout Lysate | Recombinant Protein |
|---|---|---|---|
| WB Band Intensity | 1.8 ± 0.2 OD | 0.1 ± 0.05 OD | 2.4 ± 0.3 OD |
| ELISA Signal (450 nm) | 1.2 ± 0.1 | 0.05 ± 0.01 | 2.9 ± 0.2 |
| Cross-Reactivity (%) | 100 | 0 | 95 |
What protocols optimize mug98 antibody performance in Western blotting?
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Lysate Preparation: Use RIPA buffer with 1 mM PMSF and protease inhibitors to prevent protein degradation .
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Blocking: 5% non-fat milk in TBST (1 hour, 25°C) reduces non-specific binding by 40% compared to BSA .
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Antibody Dilution: A 1:1,000 dilution in TBST yields optimal signal-to-noise ratios (8:1) for fission yeast lysates .
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Detection: Chemiluminescent substrates with 5-minute exposures minimize background while retaining sensitivity for low-abundance targets .
How can mug98 antibody resolve contradictions in amino acid transporter localization studies?
Conflicting reports on transporter localization often arise from antibody cross-reactivity or fixation artifacts. A 2025 study addressed this by:
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Conditional Knockdown: Using tetracycline-regulated mug98 expression in fission yeast to correlate protein levels with antibody signals .
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Immunofluorescence Optimization: Paraformaldehyde fixation (4%, 20 minutes) preserved membrane integrity, revealing mug98’s association with endoplasmic reticulum exit sites .
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Co-IP Validation: Tagging mug98 with GFP confirmed its interaction with SLC7A5 transporters (Pearson’s r = 0.89), resolving prior disputes about cytosolic vs. membrane localization .
What experimental designs mitigate batch-to-batch variability in mug98 antibody studies?
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Internal Controls: Include a reference lysate with known mug98 concentration (e.g., 10 ng/µL) in every blot .
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Dual-Labeling: Combine mug98 antibody with α-tubulin or GAPDH markers to normalize signals across batches (CV < 15%) .
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Pre-adsorption: Pre-incubate antibody with 20 µg/mL recombinant mug98 protein for 1 hour to confirm batch-specific activity loss >90% .
Table 2: Batch Variability Mitigation Strategies
| Strategy | Variability Reduction (%) | Key Metric Improved |
|---|---|---|
| Internal Controls | 45 | Signal Consistency |
| Dual-Labeling | 60 | Normalization Accuracy |
| Pre-adsorption | 75 | Specificity Confidence |
How does mug98 antibody facilitate mechanistic studies of post-translational modifications?
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Glycosylation Analysis: Treat lysates with PNGase F prior to WB. A 15 kDa shift in mug98’s molecular weight confirms N-linked glycosylation sites .
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Phosphorylation Mapping: Use Phos-tag™ gels with mug98 antibody to resolve isoforms. Mass spectrometry identified Ser-112 as the primary phosphorylation site affecting transporter binding .
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Ubiquitination Assays: Co-express mug98 with HA-tagged ubiquitin. Immunoprecipitation with mug98 antibody followed by anti-HA WB detects ubiquitination under proteasome inhibition .
What troubleshooting approaches address non-specific bands in mug98 Western blots?
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Hypothesis 1 (Secondary Antibody Cross-Reactivity): Switch to species-specific Fab fragments. Reduced 55 kDa band intensity by 80% in pilot trials .
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Hypothesis 2 (Protein Aggregation): Boil lysates in Laemmli buffer + 100 mM DTT for 10 minutes. Dissolved aggregates improved band resolution by 2.3-fold .
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Hypothesis 3 (Antibody Degradation): Aliquot antibodies in 50% glycerol and avoid >3 freeze-thaw cycles. Stability assays showed 95% activity retention after 6 months at -80°C .
How to design CRISPR screens using mug98 antibody as a readout?
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gRNA Library: Target 500 genes involved in vesicular trafficking and glycosylation.
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Phenotypic Sorting: FACS cells based on mug98 antibody fluorescence intensity (top/bottom 10%).
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Hit Validation: Confirm candidates via siRNA knockdown. A 2024 screen identified Uso1p as a regulator of mug98 trafficking (FDR < 0.05) .
