Mammalian transient expression services

Protein production form

    90% success rate and above 1500 proteins expressed is the best demonstration of the quality of our protein expression service! What is our winning strategy for high yield protein expression? High performance proprietary protein expression systems, a team of protein experts and dedicated protein production platforms.

    Why choose ProteoGenix for your
    protein expression in mammalian cells?

    protein expression mammalian cells

    Skyrocket your
    protein expression

    Try XtenCHOTM, the most performing protein expression system

    mammalian cell expression systems

    Wide range of mammalian expression systems

    As a protein production expert, we propose CHO and HEK expression systems with different protocols and tools.

    Fast protein expression in mammalian cells

    Large-scale production in a short timeline

    Our cell culture can reach 120L per batch. Get multi-gram quantities of protein in 4 weeks!

    Large scale protein production

    From transient to stable protein expression

    We propose a solution adapted to your requirements.

    protein expression experts

    Protein expression

    With 1500+ proteins and a success rate over 90%, our expertise has no equivalent.

    mammalian protein expression services

    Integrated solution from gene to protein

    We take care of your project from gene synthesis to protein expression.

    Our protein expression in mammalian cell
    service is XtenCHOTM inclusive!

    XtenCHOTM is the gold standard for protein expression. After many years of intensive research, ProteoGenix released an expression system able to outperform ExpiCHO, the current reference. Check some data on our recombinant antibody production page.

    This is only one demonstration of the outstanding performance we can achieve with our proprietary protein expression system. Don’t miss the opportunity to skyrocket your protein production with XtenCHOTM!

    Our protein expression in mammalian
    cells workflow

    Step Content Timeline Deliverables
    Gene synthesis
    • Gene synthesis
    • Codon optimization for mammalian expression system
    • Subcloning into an expression vector
    4 to 5 weeks
    • Protein test sample
    Pilot study
    • Plasmid amplification and preparation
    • Transfection
    • Small scale protein expression
    Transient protein expression and purification
    • Large scale protein expression (1L)
    • Affinity purification
    • QC analysis: SDS-PAGE, concentration
    3 to 4 weeks
    • Purified protein
    • Detailed report
    Stable cell pool generation
    • Stable transfection
    • Pool selection
    12 to 14 weeks
    • Stable pool vials
    • Detailed report
    Stable cell line generation
    • Selection of the best producing clones
    • Clone characterization
    • Stability study
    • RCB preparation
    • Process optimization
    20 weeks
    • RCB tested for mycoplasma
    • COA
    • Detailed report with optimized


    Protein expression adapted
    to your needs

    ProteoGenix strives at offering to its customers the most advanced protein production platforms. With XtenCHOTM and our GS deficient cell line, our experts developed their own tools to break the limits of your protein expression and to bring an adapted answer to all your challenges.
    Looking for short-term production of multi-gram amount of proteins? Need a cell line for long term recombinant protein production? Don’t go anywhere else, you are at the right place!

    Transient protein expression

    • Multi-gram quantities possible (production up to 120L)
    • Timeline: 7 to 9 weeks
    • Short-term production

    Stable cell pool generation

    • Long-term production
    • Timeline: 12-14 weeks

    Stable cell line generation

    • Multi-gram yield
    • Large scale + long-term protein production
    • Timeline: ≈6 months

    Case study: protein expression of a rabbit IgG

    Rabbit IgGs demonstrate very high affinity and specificity. However, their very low productivity often limits their use (typical protein expression yield around 20mg/L). ProteoGenix is able to express these antibodies with yields over 200mg/L.

    Protein expression protocol

    A CHO cell culture was transiently co-transfected with vectors coding for Rabbit IgG HC and LC. Cells were harvested 6-days post-transfection. Target antibody was purified by affinity.

    mammalian expression purification

    Figure 1: Target mAb purification profile. Coomassie blue staining.

    Non-reducing analysis.

    MW. Molecular weight marker. IN. Input. FT. Flow through. W. Washes. E. Eluted fractions.

    After purification, fractions of interest were pooled and final samples were concentrated and buffer exchanged. A final QC of the protein expression was then realized by SDS-PAGE in reduced and non-reduced conditions.

    Recombinant antibody production QC

    Figure 2: Final QC of purified recombinant mAb. Coomassie blue staining.

    2µg of sample loaded per lane

    Protein production results

    Yield / mg/L Purity / %
    Rabbit IgG 265 90

    When should you use protein expression in mammalian cells?

    Multi-gram protein expression is a pre-requisite for many academic (for example functional analysis, crystal structure determination…) industrial and biopharmaceutical projects. For long, achieving high yields in recombinant protein productions using mammalian cells was considered as particularly challenging. Today, achieving yields over several grams per liters is regularly possible and thus overcomes the economic issues associated with the use of mammalian cell lines. These new advances in protein expression were encouraged by the fast increase of approved biotherapeutics expressed in mammalian cells.

    More and more investments are made to develop biopharmaceuticals such as therapeutic antibodies or proteins. In this context, the use of mammalian cells for protein production is of particular interest.

    The main difference between bacterial and mammalian cell lines comes from the presence of post-translational metabolic machinery. Thus, obtaining protein expression with proper glycosylation profiles is only possible with protein production in mammalian cells. This is particularly relevant for recombinant therapeutic antibody production where proper glycosylation can induce increased efficacy, stability and safety. In contrast, antibody fragments can be produced in bacterial expression systems.

    Mammalian cells protein expression also allows for proper protein folding, a determining criteria to prevent the loss of biological activity.

    To conclude, one of the main ideas to keep in mind is that recombinant protein expression in mammalian cells increases their compatibility for further human use. That’s why they are the reference expression systems when it comes to therapeutic antibody or protein production.