Recombinant proteins for research and development
Find the Right Recombinant Protein for Your Experiment
BioCrest Sci is a recombinant protein supplier and manufacturer supporting immunology, oncology, neuroscience, infectious-disease research, drug discovery, diagnostics, assay development, and antibody programs. Search more than 6,000 recombinant protein products or work with our scientific team on a custom construct and custom recombinant protein production.
Explore by protein family
Featured Recombinant Protein Categories
Start with a biological family, then compare species, sequence range, expression system, tag, purity, endotoxin, activity, and lot-specific documentation.
Avi-tagged Proteins
Site-specific biotinylation formats for binding assays, SPR, BLI, tetramers, and cell-based workflows.
CD Proteins
Cell-surface markers and immune receptors for immunology, oncology, antibody discovery, and functional assays.
Chemokines
Chemotactic signaling proteins and receptor ligands for migration, inflammation, and immune-cell studies.
Enzymes
Recombinant enzymes and kinases for activity assays, screening, pathway studies, and reagent development.
Interleukins
Cytokines and receptors supporting immune-cell signaling, differentiation, inflammation, and disease research.
TNF Family
TNF superfamily ligands and receptors for apoptosis, inflammation, immune regulation, and drug-target research.
Viral Antigens
Recombinant viral proteins for serology, antibody development, assay validation, and infectious-disease research.
Related product families
Explore More Recombinant Protein Products
Browse additional verified product families, including growth factors, Fc receptors, interferons, and immune checkpoint proteins.
Match biology to production strategy
Multiple Recombinant Protein Expression Systems
The best system depends on folding, post-translational modification, activity, yield, scale, and downstream application. BioCrest Sci supports catalog and custom projects across several platforms.
E. coli Expression
Efficient production for many soluble proteins, antigens, enzymes, and domains when complex mammalian modifications are not required.
Mammalian Expression
Suitable for proteins requiring native-like folding, disulfide bonds, glycosylation, secretion, or functional receptor formats.
Insect-Baculovirus Expression
A scalable eukaryotic option for complex proteins, multi-domain constructs, enzymes, and selected membrane proteins.
Yeast and Cell-Free Platforms
Alternative routes for rapid screening, difficult targets, specialized formats, and proteins requiring flexible optimization.
Evidence for confident selection
Quality Information Researchers Can Evaluate
Specifications vary by product and lot. Review the product page and Certificate of Analysis, then contact our team when an assay requires additional evidence or a custom specification.
- Sequence range, construct, and tag information
- Expression system and formulation details
- Purity and molecular-weight assessment
- Lot-specific Certificate of Analysis
- Endotoxin data where applicable
- Activity or binding data when available
- Custom QC and raw-data options
- Technical review before custom production
Frequently asked questions
Recombinant Protein FAQs
How do I choose a recombinant protein for my assay?
Start with the correct species and sequence region, then evaluate expression system, tag, purity, endotoxin, activity, formulation, and lot-specific documentation against the requirements of your assay.
Which expression system should I choose?
E. coli is often efficient for simpler proteins, while mammalian or insect systems may be preferable for complex folding and post-translational modifications. Yeast and cell-free systems provide additional options for selected targets.
Can BioCrest Sci produce a protein that is not in the catalog?
Yes. Custom projects can include sequence review, construct design, expression screening, purification, characterization, scale-up, and application-specific quality control.
Can I request low-endotoxin or activity-tested protein?
Many products and custom projects can support low-endotoxin specifications or additional activity and binding tests. Confirm the required threshold and assay format with the scientific team before ordering.
Need Help Selecting or Producing a Recombinant Protein?
Share the target, species, sequence or accession number, preferred tag, application, quality requirements, and required scale. Our scientific team can help evaluate the most practical route.