FOLR1 Targeted Cancer Research: Proteins for ADC and Antibody Development

Folate receptor alpha (FOLR1, or FRα) is a clinically validated cancer target used in antibody-drug conjugate and monoclonal antibody development. Its cell-surface accessibility, expression in selected tumors and ability to support internalization make it valuable for ovarian, breast, lung and other solid-tumor research.

For conformational antibody binding and ADC target studies, choose mammalian-expressed human FOLR1. Active biotinylated FOLR1 is suitable for streptavidin-based ELISA and antibody screening. E. coli-expressed FOLR1 supports immunization and analytical research, while mouse Folr1 is useful for mouse studies and cross-reactivity evaluation.

Quick FOLR1 Protein Selection Guide

Need help selecting a FOLR1 format? Share your assay, species, tag and quantity requirements with the Beta LifeScience technical team for product guidance, current availability and a quotation.

Why FOLR1 Matters in ADC Research

FOLR1 is a glycosylphosphatidylinositol-anchored cell-surface glycoprotein that binds folic acid and reduced folate derivatives with high affinity. It supports the movement of folate into cells through receptor-mediated endocytosis.

Several properties make FOLR1 valuable for targeted cancer research:

• It is accessible on the surface of selected tumor cells.
• Its expression is elevated in several epithelial tumor types.
• It supports internalization after antibody or ligand binding.
• Its distribution can be evaluated through biomarker assays.
• Multiple protein formats can support antibody and ADC development.

The clinical validation of FRα has strengthened interest in this target. In March 2024, the FDA granted full approval to the FRα-directed ADC mirvetuximab soravtansine-gynx for eligible adults with FRα-positive, platinum-resistant epithelial ovarian, fallopian tube or primary peritoneal cancer. Patient selection uses an FDA-approved test. This provides a clear example of how target expression, diagnostic testing and targeted therapeutic design can work together in precision oncology.

FOLR1-targeted research now includes monoclonal antibodies, next-generation ADCs, bispecific antibodies, imaging agents, folate-linked compounds and cell-therapy approaches. Current clinical studies are also evaluating additional FOLR1-directed ADC candidates.

How Recombinant FOLR1 Supports ADC Development

Recombinant FOLR1 protein gives research teams a defined target reagent for characterizing antibodies and ADC candidates before moving into more complex cell-based and preclinical systems.

Antibody-Binding Confirmation

A purified FOLR1 protein can help confirm whether an antibody recognizes the intended extracellular target. Researchers can use a compatible protein format in ELISA, biolayer interferometry or surface plasmon resonance after confirming assay suitability.

Candidate Ranking

Multiple antibody clones can be compared by concentration-dependent binding, signal-to-background ratio, reproducibility and apparent binding strength. These results help teams identify promising candidates for functional evaluation.

ADC Target Validation

An ADC program requires more than target expression alone. Researchers may assess:

• Antibody affinity and specificity
• Epitope accessibility
• Target density
• Receptor internalization
• Cross-reactivity
• Candidate stability
• Cell-based activity

Recombinant FOLR1 primarily supports the binding and analytical stages of this workflow. Cell-based assays can then confirm target-dependent internalization and functional activity.

Species Cross-Reactivity

Human and mouse FOLR1 proteins can help researchers evaluate whether a candidate recognizes both species. Cross-reactivity data can support reagent selection and preclinical study planning.

Assay Development

A characterized recombinant antigen can support screening assays, concentration-response studies and analytical controls. Using a consistent target reagent across discovery stages also improves comparability between experiments. Explore Beta LifeScience’s Antibody Therapeutic and ADC Target Proteins for FOLR1 and other targets used in therapeutic antibody research.

Recommended FOLR1 Products by Application

Active Biotinylated FOLR1 for Antibody Screening

The Biotinylated Human FOLR1 Protein, Active is a strong starting choice for binding-focused workflows.

This protein is expressed in HEK293 cells and contains amino acids Arg25–Met233 with C-terminal His and Avi tags. Product specifications include:

• Greater than 95% purity by PAGE
• Greater than 95% purity by HPLC
• HEK293 expression
• C-terminal His-Avi tag
• Site-directed biotinylated format
• Endotoxin below 1 EU/µg
• ELISA-based activity data
• Lyophilized presentation

The Avi-tagged format supports controlled biotinylation and convenient capture through streptavidin-based platforms. This can help maintain consistent antigen presentation during antibody screening.

It is well suited to:

• Streptavidin-based ELISA
• Antibody clone screening
• Concentration-response analysis
• High-throughput binding studies
• Antibody–antigen interaction research
• Assay optimization

For antibody screening and streptavidin-based assays, explore the active Biotinylated Human FOLR1 Protein.

Mammalian-Expressed FOLR1 for Target Research

The Human FOLR1 BLT-05898P is expressed in mammalian cells and contains amino acids 1–233 with a C-terminal His tag.

Key specifications include:

• Human FOLR1 sequence
• Mammalian-cell expression
• C-terminal His tag
• Greater than 95% purity
• Lyophilized format
• Listed applications including immunogen, positive control, SDS-PAGE and Western blot

This product provides a high-purity mammalian-expressed option for researchers studying human FOLR1. It can support immunogen preparation, analytical detection and general target-protein research. The standard product page lists a 100 µg pack. Quantity options for 500 µg and 1 mg are also displayed through quantity pricing. Researchers planning larger studies can request current availability, pricing and bulk-order support.

Extracellular-Domain FOLR1 for Antibody Research

The Human FOLR1 BLT-03921P contains amino acids 25–233, representing an extracellular-region construct. It is expressed in HEK293 cells and includes a C-terminal 6His tag.

This format can support projects focused on:

• Extracellular FOLR1 epitopes
• Antibody generation
• Antigen recognition
• Analytical target research
• Candidate antibody characterization

The mammalian expression system provides eukaryotic protein processing, which may be valuable when antibody recognition depends on folding or glycosylation-associated features.

E. coli-Expressed FOLR1 for Analytical Applications

The Human FOLR1 BLT-01103P contains amino acids 25–234 and is produced in E. coli with an N-terminal 6His tag.

Its listed applications include:

• Positive control
• Immunogen
• SDS-PAGE
• Western blot

This construct provides a practical option when the experiment focuses on linear epitopes, immunization or denatured-protein detection. It is supplied in lyophilized form and has greater than 85% stated purity.

Mouse Folr1 for Preclinical Research

The Mouse Folr1 BLT-06630P is expressed in mammalian cells and contains amino acids 1–231 with a C-terminal His tag.

This product can support:

• Mouse-focused Folr1 research
• Cross-reactivity evaluation
• Immunogen preparation
• Positive-control applications
• SDS-PAGE and Western blot

Comparing candidate binding to human and mouse FOLR1 may help research teams understand species recognition before planning downstream studies.

Mammalian vs E. coli-expressed FOLR1.

The best expression system depends on the intended application and the type of epitope being studied.

FOLR1 is a glycoprotein, so mammalian expression is generally the better starting point when native-like processing or conformational antibody recognition is important. HEK293-produced constructs can be particularly useful for extracellular-target and therapeutic-antibody research. E. coli-produced FOLR1 is valuable when the experiment focuses on linear sequence recognition, immunization, SDS-PAGE or Western blot analysis.

Researchers should match the expression system to the intended epitope, assay format and validation requirements.

Why Choose Biotinylated FOLR1?

Biotinylated FOLR1 allows the target protein to be captured through the high-affinity biotin–streptavidin interaction. When biotin is introduced through an Avi tag, the resulting site-directed format can provide more controlled antigen presentation than random chemical labeling.

This makes biotinylated FOLR1 attractive for:

• ELISA development
• High-throughput antibody screening
• Antibody concentration-response testing
• Streptavidin-based capture assays
• Comparative candidate evaluation
• Selected BLI and SPR workflows

Before using the protein in BLI or SPR, confirm sensor compatibility, immobilization strategy, running buffer, loading concentration and activity requirements. The active biotinylated product includes ELISA binding data with an anti-FOLR1 antibody. This functional information provides added confidence for researchers beginning an antibody-binding workflow.

Ready to build a FOLR1 binding assay? View the active biotinylated protein specifications or request technical guidance for your assay.

What to Check Before Ordering FOLR1 Protein

A buyer-focused product comparison should consider more than target name and price.

Species and Sequence Range

Confirm whether the project requires human or mouse FOLR1. Review the expressed sequence to ensure that it contains the required extracellular region or antibody epitope.

Expression System

Choose mammalian expression when eukaryotic processing is important. Choose E. coli expression for suitable immunization and analytical workflows.

Tag Type and Position

His tags support purification and detection. Avi tags enable site-specific biotinylation. Confirm that the tag position aligns with the intended immobilization and detection strategy.

Purity and Activity

Review the stated purity and the method used to determine it. For binding assays, activity data can be more informative than purity alone.

Endotoxin

Check the endotoxin specification when planning sensitive cell-based applications. Additional endotoxin-removal options may be discussed for customized projects.

Formulation and Storage

Beta LifeScience FOLR1 products are supplied in lyophilized form. Follow the product-specific reconstitution and storage instructions and prepare aliquots to support consistent handling.

Documentation

Ask the technical team about available lot-specific documentation, analytical data, CoA and SDS files before ordering when your laboratory or purchasing department requires these materials.

Pack Sizes, Pricing and Ordering Options

Selected standard FOLR1 product pages display a 100 µg pack. Quantity pricing may also be available for 500 µg and 1 mg amounts. Product availability and pricing can change, so researchers should check the relevant product page or request a current quotation.

Beta LifeScience supports:

• Direct online purchasing for eligible products
• Standard research pack sizes
• Quantity pricing
• Bulk-order quotations
• Product-selection guidance
• Custom tag and sequence requests
• Endotoxin-removal options
• Liquid or lyophilized formats
• Technical and ordering support

For standard orders, select the required quantity on the product page and add the product to the cart. For bulk quantities or customized specifications, submit the catalog number, required amount, assay, species, sequence and tag requirements through the online inquiry form. Current availability and lead time should be confirmed before finalizing a time-sensitive project.

Custom FOLR1 Protein Production

A catalog construct may meet many discovery-stage requirements. Customized production becomes valuable when a project requires a different sequence boundary, fusion partner, tag, purity specification, expression host or production scale.

Custom FOLR1 projects may include:

• Alternative extracellular-domain boundaries
• Fc-tagged constructs
• His- or Avi-tagged proteins
• Customized tag positions
• Low-endotoxin production
• Liquid formulation
• Bulk research quantities
• Assay-specific quality testing

Need a different sequence, tag, purity level or production scale? Discuss your project through Beta LifeScience’s Protein Expression Service.

Providing a clear project brief can accelerate technical evaluation. Include:

• Target name and accession number
• Species
• Desired amino acid range
• Expression system
• Tag and tag position
• Required quantity
• Purity target
• Endotoxin requirement
• Intended application
• Preferred formulation

The Beta LifeScience team can review these requirements and provide a customized production proposal.

Why Source FOLR1 Proteins From Beta LifeScience?

Beta LifeScience provides recombinant proteins for basic life science research, antibody development and drug discovery. Its FOLR1 portfolio offers several formats within one supplier platform:

• Active biotinylated human FOLR1
• Mammalian-expressed human FOLR1
• E. coli-expressed human FOLR1
• Mammalian-expressed mouse Folr1
• Multiple sequence and tag configurations
• Standard and bulk quantities
• Custom protein-production support

This selection allows research teams to choose a product according to the assay instead of adapting every workflow to one protein format.

Explore the complete Antibody and Cell Therapy Target collection, review Biotinylated Proteins, or submit a project inquiry for product selection and custom-production support.

FAQs

Which FOLR1 protein is best for ADC target research?

A mammalian-expressed human FOLR1 protein is the preferred starting point for conformational antibody binding and ADC target research. The final choice should match the required sequence, tag, assay and activity data.

Which FOLR1 product is best for ELISA?

The Biotinylated Human FOLR1 Protein, Active is the strongest Beta LifeScience option for streptavidin-based ELISA and antibody screening. It includes a C-terminal His-Avi tag and ELISA activity data.

Can FOLR1 protein be used to generate antibodies?

Yes. Recombinant FOLR1 can serve as an immunogen for antibody-generation research. The expression system and protein format should be selected according to whether the desired antibodies will recognize linear or conformational epitopes.

Is mammalian-expressed FOLR1 better than E. coli-expressed FOLR1?

Mammalian-expressed FOLR1 is preferred when eukaryotic processing, glycosylation or conformational recognition is important. E. coli-expressed FOLR1 is a practical option for immunization, SDS-PAGE, Western blot and linear-epitope research.

Why is FOLR1 used in ADC development?

FOLR1 is accessible on the cell surface and supports receptor-mediated internalization. These properties allow researchers to develop antibodies that bind the target and investigate intracellular delivery of an attached payload.

Is mouse FOLR1 available?

Yes. Beta LifeScience offers Mouse Folr1 BLT-06630P, a mammalian-expressed protein for mouse-focused and cross-reactivity research.

Are Bulk Quantities Available?

Selected products display quantity pricing for larger amounts, and additional bulk quantities can be requested. Contact Beta LifeScience for current availability, lead time and a bulk-order quotation.

Can I Request a Custom FOLR1 Construct?

Yes. Researchers can request customized sequence ranges, tags, expression systems, endotoxin levels, formulations and production quantities through the Protein Expression Service.

References

1. FDA: Approval of Mirvetuximab Soravtansine-gynx for FRα-Positive Ovarian Cancer
2. NCBI Gene: Human FOLR1 Folate Receptor Alpha
3. Folate Receptor Alpha for Cancer Therapy: An Antibody and Antibody-Drug Conjugate Perspective
4. ClinicalTrials.gov: FOLR1-Targeting Luveltamab Tazevibulin Study
5. FDA: VENTANA FOLR1 Companion Diagnostic Assay