CRD1 Antibody

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Description

Definition and Background

CRD1 Antibody refers to immunoreagents targeting either the CRD1 (Cone Rod Dystrophy 1) protein or cysteine-rich domain 1 (CRD1) of specific receptors. These antibodies serve distinct roles:

  • Plant Biology: CRD1 in Arabidopsis thaliana encodes magnesium-protoporphyrin IX monomethyl ester cyclase, a chloroplast enzyme critical for chlorophyll biosynthesis . Antibodies against this protein are used to study photosynthesis mechanisms.

  • Immunotherapy: In humans, CRD1 denotes the membrane-distal cysteine-rich domain 1 of receptors like CD40, CD27, and 4-1BB. Antibodies targeting CRD1 domains modulate immune responses, enhancing anti-tumor activity .

CRD1 Antibodies in Plant Research

  • Target: Recombinant Arabidopsis thaliana CRD1 protein (37–409 amino acids) .

  • Host/Clonality: Rabbit-derived polyclonal IgG .

  • Applications: Western blot (1:500–1:2000 dilution), ELISA .

CRD1-Targeting Antibodies in Immunotherapy

  • Epitopes: CRD1 domains of TNFR superfamily receptors (e.g., CD40, 4-1BB) .

  • Binding Characteristics:

    ReceptorCRD1 Antibody FunctionKey Mechanism
    CD40Strong agonist activityBinds membrane-distal CRD1, enhancing CD40 signaling
    4-1BBSuperagonistic clusteringInduces receptor clustering independent of FcγR binding

Plant Biology

  • Chlorophyll Biosynthesis: CRD1 antibodies validate enzyme localization and activity in chloroplasts .

  • Species Reactivity: Specific to Arabidopsis thaliana, Gossypium hirsutum, and Saccharomyces cerevisiae .

Cancer Immunotherapy

  • Preclinical Findings:

    • CD40 Agonists: CRD1-binding antibodies enhance dendritic cell activation and T-cell priming .

    • 4-1BB Agonists: Antibodies like HOT-1030 (targeting CRD1) show potent anti-tumor efficacy without liver toxicity .

Clinical Trials Involving CRD1-Targeting Antibodies

AntibodyTargetPhaseKey OutcomeReference
CP-870,893CD40 (CRD1)Phase I14% partial response in melanoma; transient CD19+ B-cell depletion NCT02225002
LVGN60514-1BB (CRD1)Phase I50% tumor reduction in head/neck squamous carcinoma NCT04130542

Mechanisms of Action

  • Agonist Activity: CRD1-targeted antibodies induce receptor clustering, amplifying downstream signaling (e.g., NF-κB activation) .

  • Fc Engineering: Modified Fc regions enhance tumor-specific activity while reducing systemic toxicity .

Emerging Trends

  • Bispecific Antibodies: Combining CRD1-targeting arms with checkpoint inhibitors (e.g., anti-PD-1) to overcome resistance .

  • Structural Optimization: Computational modeling to refine CRD1-binding interfaces for higher specificity .

Product Specs

Buffer
Preservative: 0.03% ProClin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
14-16 week lead time (made-to-order)
Synonyms
CRD1 antibody; ACSF antibody; AT103 antibody; CHL27 antibody; ZIP antibody; At3g56940 antibody; F24I3.20Magnesium-protoporphyrin IX monomethyl ester [oxidative] cyclase antibody; chloroplastic antibody; Mg-protoporphyrin IX monomethyl ester oxidative cyclase antibody; EC 1.14.13.81 antibody; Copper response defect 1 protein antibody; Dicarboxylate diiron protein antibody; AtZIP antibody; MPE-cyclase antibody
Target Names
CRD1
Uniprot No.

Target Background

Function

This antibody targets an enzyme that catalyzes the formation of the isocyclic ring during chlorophyll biosynthesis. Specifically, it mediates the cyclization reaction converting magnesium-protoporphyrin IX 13-monomethyl ester (MgPMME) to divinylprotochlorophyllide (Pchlide), a precursor common to all chlorophylls.

Gene References Into Functions
  1. Studies using chl27-t knockdown mutants have demonstrated impaired growth and chloroplast development due to PSII reaction center damage. These mutants also exhibit significant downregulation of genes involved in chlorophyll biosynthesis and iron uptake. PMID: 18682427
Database Links

KEGG: ath:AT3G56940

STRING: 3702.AT3G56940.1

UniGene: At.48778

Protein Families
AcsF family
Subcellular Location
Plastid, chloroplast inner membrane; Peripheral membrane protein. Plastid, chloroplast thylakoid membrane; Peripheral membrane protein.

Q&A

Experimental Design for CRD1 Antibody Validation

  • Question: How can I validate the specificity of a CRD1 antibody in my research?

  • Answer: To validate the specificity of a CRD1 antibody, you can use Western Blotting (WB) and ELISA techniques. First, ensure the antibody is specific to the CRD1 protein by using it to detect recombinant CRD1 protein in WB. Then, perform ELISA assays to confirm the antibody's binding affinity to CRD1. Additionally, use negative controls (e.g., non-specific IgG) and positive controls (e.g., known CRD1-expressing samples) to assess specificity.

Data Contradiction Analysis in CRD1 Studies

  • Question: What strategies can I use to resolve contradictions in data obtained from different CRD1 antibody applications?

  • Answer: When encountering data contradictions, consider the following strategies:

    • Re-evaluate Experimental Conditions: Ensure that experimental conditions, such as antibody dilution and incubation times, are consistent across experiments.

    • Use Multiple Detection Methods: Validate findings using multiple detection methods (e.g., WB, ELISA, immunofluorescence).

    • Check Antibody Specificity: Verify the specificity of the CRD1 antibody by testing it against non-specific targets.

    • Consider Biological Variability: Account for biological variability by using multiple biological replicates.

Advanced Research Questions: Epitope Mapping

  • Question: How can I perform epitope mapping for a CRD1 antibody to understand its binding site?

  • Answer: Epitope mapping can be achieved through several methods:

    • Peptide Array: Use overlapping peptides of the CRD1 protein to identify the binding region.

    • Alanine Scan: Substitute amino acids in the potential epitope region with alanine to assess the impact on binding.

    • Hydrogen-Deuterium Exchange (HDX): This method can identify regions of the protein that are protected from exchange when bound by the antibody.

Cross-Reactivity and Specificity in Different Species

  • Question: How do I assess the cross-reactivity of a CRD1 antibody across different species?

  • Answer: To assess cross-reactivity:

    • Use WB or ELISA: Test the antibody against lysates or proteins from different species.

    • Sequence Alignment: Compare the CRD1 protein sequences across species to predict potential cross-reactivity based on sequence similarity.

    • Control Experiments: Include controls with known CRD1-expressing samples and non-specific IgG to validate specificity.

Optimizing CRD1 Antibody Applications

  • Question: What are some strategies for optimizing CRD1 antibody applications in challenging samples?

  • Answer: Optimization strategies include:

    • Antibody Dilution: Optimize the antibody dilution to enhance signal-to-noise ratio.

    • Blocking Conditions: Adjust blocking conditions (e.g., blocking reagents, incubation times) to reduce non-specific binding.

    • Sample Preparation: Ensure proper sample preparation, including efficient protein extraction and denaturation.

Troubleshooting Common Issues

  • Question: How can I troubleshoot common issues encountered when using CRD1 antibodies, such as weak signals or non-specific binding?

  • Answer: Common troubleshooting steps include:

    • Check Antibody Storage: Ensure the antibody is stored correctly (e.g., at -20°C or -80°C).

    • Optimize Incubation Times: Adjust incubation times for primary and secondary antibodies.

    • Use Positive Controls: Include known positive controls to verify the antibody's functionality.

Advanced Techniques for CRD1 Research

  • Question: What advanced techniques can be used to further characterize CRD1 protein interactions or functions?

  • Answer: Advanced techniques include:

    • Co-Immunoprecipitation (Co-IP): To study protein-protein interactions involving CRD1.

    • Proximity Ligation Assay (PLA): To visualize protein interactions at the cellular level.

    • Biochemical Assays: To assess enzymatic activity or other functional aspects of CRD1.

Example Data Table: CRD1 Antibody Validation

AssayAntibody DilutionSignal IntensitySpecificity
WB1:1000StrongSpecific
ELISA1:500HighSpecific
IF1:200Clear LocalizationSpecific

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