rei-1 Antibody
Description
Introduction to Rei1 and Rei1 Antibodies
Rei1 is a conserved eukaryotic cytoplasmic protein critical for late-stage maturation of the 60S ribosomal subunit. Antibodies targeting Rei1 (hereafter referred to as Rei1 antibodies) are specialized tools used to study its molecular interactions, localization, and functional roles in ribosome biogenesis. These antibodies have been instrumental in elucidating Rei1’s partnership with factors like Arx1, Jjj1, and Reh1, as well as its redundancy with Reh1 in stabilizing 60S subunits .
Key Applications of Rei1 Antibodies
Rei1 antibodies are primarily employed in:
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Western blotting: Detecting Rei1 expression levels and protein variants (e.g., deletion mutants) .
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Immunofluorescence microscopy: Visualizing Rei1-dependent recycling of ribosomal export factors like Arx1 .
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Co-immunoprecipitation: Mapping Rei1’s interaction partners, such as Jjj1, a J-protein chaperone .
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Functional studies: Assessing ribosomal subunit stability and polysome profiles in yeast mutants .
Rei1-Jjj1 Interaction in Ribosome Biogenesis
Rei1 antibodies confirmed a direct physical interaction between Rei1 and Jjj1 via in vitro binding assays. This interaction is essential for dissociating the Arx1/Alb1 heterodimer from nascent 60S subunits, a prerequisite for ribosomal maturation .
Functional Redundancy with Reh1
Studies using Rei1 antibodies revealed that Rei1 and Reh1 jointly stabilize cytoplasmic 60S subunits. Double reh1Δ rei1Δ mutants exhibit salt-labile 60S subunits and impaired polysome profiles, indicating their overlapping roles in structural maturation .
Impact of Rei1 Mutations
Deletion mutants (e.g., Rei1Δ262–327 and Rei1Δ328–390) showed cytoplasmic mislocalization of Arx1-GFP and growth defects in yeast, demonstrating Rei1’s role in nuclear recycling of export factors .
Table 1: Rei1 Antibody Applications in Key Studies
Validation and Specificity
Rei1 antibodies exhibit high specificity, as demonstrated by:
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Recognition of Rei1 truncation mutants (e.g., Rei1Δ8–50) but not non-functional variants lacking zinc fingers .
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Cross-validation with orthogonal methods like sucrose gradient profiling .
Future Directions
Rei1 antibodies remain vital for probing unanswered questions, such as:
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Structural dynamics of Rei1 during 60S maturation.
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Evolutionary divergence between Rei1 and Reh1 in higher eukaryotes.
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Therapeutic targeting of ribosomal biogenesis in diseases linked to translation defects.
Product Specs
**Constituents:** 50% Glycerol, 0.01M PBS, pH 7.4
Target Background
Q&A
Basic Research Questions
What functional roles does REI-1 play in cellular trafficking, and how can its antibody be used to study these mechanisms?
REI-1 is a Rab11 guanine nucleotide exchange factor (GEF) critical for endocytic recycling, Golgi-endosome trafficking, and cytokinesis . Key methodologies include:
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Co-localization assays: Combine REI-1 antibodies with markers like SYN-16 (late Golgi) or RAB-11.1 to map spatial relationships .
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Loss-of-function experiments: Compare wild-type and rei-1 mutant phenotypes in C. elegans embryos using immunofluorescence to assess RAB-11.1 mislocalization .
How do researchers validate the specificity of REI-1 antibodies in model organisms?
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Western blot controls: Use lysates from REI-1 knockout strains (e.g., C. elegans rei-1 mutants) to confirm absence of signal .
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Peptide-blocking assays: Pre-incubate antibodies with synthetic REI-1 C-terminal peptides to test signal reduction .
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Cross-reactivity screens: Test antibody performance in phylogenetically related species (e.g., yeast REI1 vs. human SH3BP5) .
Advanced Research Challenges
How to resolve contradictions in REI-1 localization data across experimental systems?
Discrepancies may arise from differential membrane binding requirements or species-specific GEF interactions. Strategies include:
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Liposome dependency assays: Test REI-1 antibody labeling efficiency in membrane fractionation experiments, as REI-1’s GEF activity is liposome-dependent .
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Combinatorial knockdowns: Use rei-1/rei-2 double mutants to unmask redundant GEF functions in Rab11 activation .
What experimental designs address partial RAB-11.1 membrane association in rei-1 mutants?
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Time-lapse imaging: Track RAB-11.1 dynamics during cytokinesis in rei-1 mutants using dual-color antibodies .
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Rescue experiments: Express truncated REI-1 variants (e.g., ΔSH3BP5 domain) to identify functional domains required for RAB-11.1 recruitment .
Methodological Optimization
How to engineer REI-1 antibodies for multispectral imaging or CUT&RUN applications?
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Epitope tagging: Fuse REI-1 with HA/FLAG tags and validate using commercial antibodies (e.g., anti-HA) alongside custom REI-1 reagents .
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Crosslinking optimization: Test formaldehyde vs. DSG fixation for chromatin-bound REI-1 detection in CUT&RUN assays .
Data Analysis and Interpretation
Table 1: Common REI-1 Antibody Validation Metrics
| Method | Target Application | Detection Limit | Key Controls |
|---|---|---|---|
| Western Blot | Protein expression | 0.5–1 ng/mL | KO lysates, peptide blocking |
| Immunofluorescence | Subcellular localization | 10–20 cells/field | Isotype controls, siRNA knockdown |
| CUT&RUN | Chromatin binding | 50–100 cells | IgG controls, input normalization |
Table 2: Troubleshooting REI-1 Antibody Challenges
Structural and Functional Insights
Can REI-1 antibody data inform Rab11 activation mechanisms?
Yes. Structural studies reveal that REI-1 binds Rab11 in its GDP-bound state, and antibodies targeting its C-terminal domain (critical for liposome interaction) can block GEF activity in vitro . For example:
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Competitive inhibition assays: Pre-incubate REI-1 with antibodies to test Rab11 activation deficits in GTPγS exchange assays .
