Nebulabio is a leading global Contract Research Organization (CRO) and Contract Development and Manufacturing Organization (CDMO) with deep expertise in Protein Expression Services. For over 15 years, we have successfully tackled the challenge of producing complex, biologically active proteins for clients in academia, biotechnology, and pharmaceutical industries. Our specialized teams—comprising molecular biologists, cell culture scientists, and protein chemists—possess extensive experience in optimizing expression across diverse host systems to meet the unique demands of each target. We understand that every protein presents a distinct set of challenges related to solubility, folding, post-translational modifications, and yield. Our service is designed to navigate these complexities, offering a strategic, multi-platform approach to deliver high-quality, purified proteins, from difficult-to-express membrane proteins and multi-subunit complexes to antigens and enzymes. We are your partner in transforming a gene sequence into a reliable, well-characterized reagent that accelerates your research and development timelines.
☞Protein Expression System Comparison
Choosing the optimal expression host is the most critical decision for project success. We offer expertise across all major systems and will recommend the best strategy based on your protein's properties, required modifications, and intended use. Below is a comparative overview.
Expression System | Typical Hosts | Key Advantages | Key Limitations | Best For |
Prokaryotic | E. coli (e.g., BL21, Rosetta) | Fastest & most cost-effective; high yields for many proteins; extensive toolbox for optimization; easy scale-up. | Lacks eukaryotic PTMs; often forms inclusion bodies; cannot express very large/complex proteins. | Cytosolic proteins, enzymes, antigens for antibody production, protein fragments, proteins for structural studies (if soluble). |
Yeast | Pichia pastoris, S. cerevisiae | High-density fermentation; secretes protein; performs some PTMs (glycosylation, but high-mannose type); lower cost than mammalian. | Glycosylation differs from humans; can have proteolytic degradation. | Secreted proteins, disulfide-bonded proteins, enzymes, some therapeutic proteins (after engineering). |
Insect Cell / Baculovirus | Sf9, Sf21, High Five™ cells | Excellent for large, complex, multi-subunit proteins; performs most eukaryotic PTMs; high expression levels; good for membrane proteins. | Glycosylation is simpler than mammalian; slower than bacterial systems; viral amplification required. | Protein complexes, kinases, GPCRs, ion channels, viral antigens, proteins requiring eukaryotic folding. |
Mammalian Cell | HEK293, CHO, ExpiCHO™ | Gold standard for human therapeutics; performs human-like PTMs (complex glycosylation, γ-carboxylation); ensures proper folding and activity; secretes protein. | Most expensive & slowest; lower yields; requires complex media; potential for viral contamination. | Antibodies, therapeutic proteins, receptors, proteins requiring authentic human PTMs for function. |
Cell-Free | E. coli or Wheat Germ Lysate | Fastest from gene to protein (hours); ideal for toxic proteins; allows incorporation of unnatural amino acids; easy labeling. | Very high cost per mg; limited scale; not suitable for large-scale production. | Rapid screening, toxic proteins, isotope labeling for NMR, small-scale functional testing. |
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☞Protein Expression Technical Process
Nebulabio’s production process is a systematic, stage-gated workflow, optimized for each host system to maximize the probability of delivering a functional protein.
Phase 1: Construct Design & Vector Engineering
Phase 2: Host Cell Transformation & Screening
Phase 3: Scale-Up Production
Phase 4: Protein Purification & Refolding
Phase 5: Characterization & Quality Control
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☞Nebulabio Service Process
Our client-centric workflow ensures a collaborative, transparent, and efficient partnership from concept to purified protein.
Step 1: Project Consultation & Strategy
We discuss your protein target, required quantity, purity, intended application, and timeline. Based on this, we provide a detailed project proposal recommending the optimal expression system and outlining the plan, deliverables, and cost.
Step 2: Gene Submission & Construct Design
You provide the gene sequence (or DNA). Our molecular biology team performs codon optimization, designs constructs, and proceeds with vector cloning. We provide sequence verification data.
Step 3: Expression Screening & Optimization
We execute small-scale expression trials and send you a screening report with SDS-PAGE data, recommending the best-performing construct and conditions for scale-up.
Step 4: Scale-Up Production & Purification
Upon your approval, we scale up the expression, harvest the material, and execute the purification and polishing strategy.
Step 5: Characterization & Client Review
We perform comprehensive QC on the final purified protein and send you a draft Certificate of Analysis (CoA) and characterization report for review.
Step 6: Final Delivery & Support
After your confirmation, we ship the purified protein (liquid or lyophilized) under appropriate conditions, along with the final CoA, analytical data, and project summary. We offer post-delivery technical support.
Our Service Process Flowchart:
☞Applications of Protein Expression Services
Our services provide the essential protein reagents for a vast spectrum of scientific and commercial applications:
Structural Biology & Biophysics: Producing high-purity, homogeneous proteins for X-ray crystallography, cryo-electron microscopy (cryo-EM), and nuclear magnetic resonance (NMR) studies.
Drug Discovery & Screening: Expressing therapeutic targets (enzymes, receptors, ion channels) for high-throughput screening (HTS) campaigns, mechanism-of-action studies, and co-crystallization with drug candidates.
Antibody & Diagnostic Development: Producing antigens for animal immunization, assay calibrators, and recombinant proteins for use in ELISA, lateral flow tests, and biosensor development.
Enzymology & Biochemical Assays: Supplying active enzymes for kinetic studies, substrate specificity profiling, and industrial biocatalyst development.
Therapeutic Protein & Vaccine Development: Developing scalable production processes for biologics such as monoclonal antibodies, cytokines, growth factors, and viral subunit vaccines, from pre-clinical through to clinical manufacturing.
Protein-Protein Interaction Studies: Producing individual components of protein complexes for pull-down assays, surface plasmon resonance (SPR), and other interaction mapping techniques.
Cell & Gene Therapy: Manufacturing critical proteins used as growth factors, differentiation agents, or components of cell culture media for advanced therapy medicinal products (ATMPs).
Partner with Nebulabio to overcome your protein expression challenges. Leverage our multi-platform expertise and end-to-end project management to obtain the high-quality protein you need to advance your research or product development.
For more information, please contact us at info@nebulabio.cn or +86-15801534258.
