Human Anti-CTLA-4 (HRP)

This product is a full-length Human IgG1 recombinant antibody specific to CTLA-4. It was produced in Nicotiana benthamiana plants via Agrobacterium tumefaciens-mediated infiltration.

100 µg      |     Catalogue Number: CBT_A0064

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Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4), also known as CD152, is a critical immune checkpoint receptor that plays a pivotal role in regulating T-cell activation and immune responses. By binding to the B7 ligands expressed on antigen-presenting cells, CTLA-4 acts as a negative regulator, downregulating T-cell activation and dampening immune responses. While this mechanism is crucial for preventing excessive immune reactions and autoimmune disorders, it can also hinder effective immune responses against cancer cells.  Our PtX™ Human Anti-CTLA-4 exhibits high specificity towards CTLA-4 and undergoes rigorous testing to ensure consistent performance and reliability. This specificity allows researchers to elucidate the specific roles of CTLA-4 in immunological processes.

PtX™ Human Anti-CTLA-4 (HRP) is suitable for use in Western blot and ELISA applications. As it is fused at the genetic level to the Horseradish Peroxidase reporter enzyme, it saves time and money as only a single antibody incubation step is required, compared to the usual two.

Additional information

Available Unit Size

0.1mg, 1mg, 10mg, 100mg, 200mg

Key Benefits

This product is a recombinant monoclonal antibody that offers several benefits including the following:

  • Enhanced signal intensity and sensitivity
  • Reduced background noise
  • Compatibility with multiple species and antibody isotypes
  • Minimized steric hindrance.
  • Batch-to-batch consistency.
  • No animals or animal products are used in the development of this protein.
  • BSA and Azide free.

For more information on plant-made, recombinant monoclonal antibodies click here. 


Product Name PtX™ Human Anti-CTLA-4 (HRP) Recombinant Antibody
Catalogue Number CBT_A0064
Expression Host Nicotiana benthamiana plants
Clonality Monoclonal, recombinant
Species and Isotype Human IgG1
Tag None
Reporter Protein Horseradish Peroxidase (HRP)
Description This product is a full-length Human IgG1 recombinant antibody specific to CD28, fused to HRP at the genetic level. It was produced in Nicotiana benthamiana plants via Agrobacterium tumefaciens-mediated infiltration.
Target Name CTLA-4
Verified Applications ELISA, Western blot
Dilution Range ELISA (1: 1 000 – 1: 104 000)

Western blot (1: 1 000 – 1: 2 000)

Tested Species Reactivity     Human
Concentration                   1 mg/ml
Form Liquid
Colour Clear with faint red tinge
Preparation Ready to use
Storage Short term (up to one week): 2 – 8 °C

Long term: Aliquot and store at – 20 °C

Store immediately. Aliquot and avoid multiple freeze thaw cycles.

Storage Buffer 0.1 M Phosphate Buffered Saline, pH 7.4.
Preservative: 50% Glycerol
Purification Notes This product was purified using Protein A- affinity chromatography.
Purity 95 % as determined by SDS-PAGE
General Notes If for any reason the product does not perform as specified, please contact our scientific support team for assistance by emailing

For Research Use only, unless otherwise indicated.


Figure 1. ELISA Dose Response curve using PtX™ Human Anti-CTLA-4 (HRP) Antibody from 0,0008 – 6 ng/uL to detect 50 ng SARS-CoV-2 Nucleocapsid Phosphoprotein. Experiments were performed in triplicate, with error bars representing standard deviation (SD).

Figure 2. Western blot of decreasing amounts of Human CTLA-4 Protein (22-27 kDa) detected with PtX™ Human Anti-CTLA-4 (HRP) Antibody at 1: 1 000.

PtX™ | Plant-Based Expression

The biotechnology behind the development and manufacture of this product, transient plant-based expression, effectively turns Nicotiana benthamiana plants into single-use, biodegradable bioreactors. Infiltrating this plant species with Agrobacterium tumefaciens cells, transformed with our proprietary plant expression vectors, allows rapid production of a wide variety of recombinant proteins. Plants are harvested and proteins extracted by various stages of filtration, clarification, purification, and polishing – resulting in a highly functional final product.

Visit our Technology page to learn more.


  • For Research Use Only.
  • Not for diagnostic or therapeutic use.
  • Not for resale without express authorization.
  • Trademark.

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