Cusabio manufactures and supplies recombinant proteins. Native Protein, Active Protein, Transmembrane Protein are favored deeply by our customers.


Over more than 16 years, CUSABIO Protein Expression Platform has established five recombinant expression systems from prokaryotic (E.coli) to eukaryotic (Yeast, mammalian cell and insect baculovirus), and has also built unique in vitro E.coli expression system, which enables us to express transmembrane proteins that are usually quite difficult to express. Furthermore, CUSABIO protein QC department owns a professional technical team, equipped with advanced experimental apparatus, to ensure each protein has a complete COA report and high quality. CUSABIO's purified proteins surpass 90% purity as detected by SDS-PAGE analysis.

We currently have 60+ native proteins, 100+ small molecule antigens, 750+ active proteins, 12000+ recombinant proteins , 13,000+ cDNA clones, 400+ transmembrane proteins, 500,000+ semi-customized recombinant proteins, and also could provide risk-free protein expression service and Gene, Oligo Synthesis service. All these products belong to our Protein Product Line.


Why choose us?

1. 100% Risk-Free Performance Guaranteed

CUSABIO protein products are carefully validated under strict QC standards to ensure the performance. If the product does not perform as promised in the manual, just contact us before expiration date for technical support, replacement or refund.

2. Strict QC Process

The quality of our proteins is the cornerstone of our ability to serve our clients. For this reason, we invest tremendous resources in developing proteins, validating their application, managing, controlling and improving quality. Each protein will undergo our standardized quality control process before shipped.

  • Protein Concentration Detection
  • Molecular Detection
  • Purity Detection
  • Endotoxin Detection
  • Biological Activity Detection (This procedure is only applied to activity validated proteins)
  • Sequence AccuracyRead More

3. Customers Testimonials

  • Customers Testimonials 01

    I hope this e-mail finds you well. I recently ordered 50 ug of the human Carbonicanhydrase 9 (CA9) protein and is really satisfied with it. We have ordered this protein for 5 times in total and all lots have good performance. Now we would like to order 10mg and we believe that the new lot will also work well in our detection.

    A researcher from Harvard Medical School

  • Customers Testimonials 02

    Mouse Saa3 protein, we tried it and it works well on our luciferase system. We will probably order more in the future.

    A researcher from Columbia University

  • Customers Testimonials 03

    I used Decorin antibody and it worked very well, so I placed another order.

    A researcher from University of Rochester

  • Customers Testimonials 04

    The results of immunofluorescent staining for TFRC, DNMT38, SOX2 and Itgb1 are very good. In addition, the results of western blot for MAPK1 and Hba have good quality too.

    A researcher from Augusta University

  • Customers Testimonials 05

    Thank you for the successful synthesis of the protein Crassostrea gigas A-kinase anchor protein7 isoform X2 that we had ordered in last November. We were very glad to find the both versions enzymatically active.

    A researcher from Estonian Academy of Sciences

  • Customers Testimonials 06

    We ordered your human WFS1 protein last year. We are satisfied with your product and your services. We are conducting a long-term project and need a large amount of this protein.

    A professor from Heidelberg University

4. The Characteristics of Five Expression Systems

We have five recombinant expression systems, including Yeast, E. coli, Baculovirus-infected insect cell, Mammalian cell and Cell-free (in vitro E.coli). Different expression systems have various characteristics and are suitable for expressing different proteins, which can satisfy the different experimental requirements of researchers. Here is some introduction to the characteristics of five expression systems which could help you to choose a suitable system.Read More

5. Multiple Tags for Recombinant Protein

We could provide multiple tags for each protein to meet the different needs of different customers. Here we list the possible tag types of each expression system. Please click here to more details.

6. Bulk Order

  • Capacity

    Big fermentation tanks (50L, 500L) allow us to produce protein in large scale. We have successfully completed 100mg, 200mg, 500mg industrial bulk orders.

    CUSABIO Bulk Order
  • Order Request

    You can use Protein name / Cat No / Alias / Abbreviations / Uniprot No to search your desired protein in the above search bar, which contain millions of proteins, then you can request the quotation through the livechat or send your request to [email protected].

7. Professional R&D Team

Our company has a R&D team consisted of scientists with Doctorate and Master Degrees. More than 60% of the total number of employees are in tech service team, including 20% PhDs and 40% Masters; Technical elites are from the well-known domestic institutions, with years of experience in the development of proteins.


8. Animal-free

Animal-free recombinant proteins

CUSABIO is glad to tell you that we have developed our line of animal-free recombinant proteins, which drastically minimize the variable factors and potential contamination of mammalian pathogens during the production process. These animal-free proteins are produced in animal-free media, and the purification equipment is also animal component free. animal-free recombinant proteins are worth being owned!

9. Good Manufacturing Practices (GMP)-grade Proteins

  • 4000㎡ Research Labs
  • 2000㎡ GMP-level Production Workshop
production equipments

10. The Number of New Products

Our Protein Expression Platform has established five recombinant expression systems from prokaryotic to eukaryotic, and has also built cell-free expression system. We also set up a special and independent protein quality control department, which is in accordance with the quality standard of international protein market, to detect protein's purity, activity, endotoxin level, etc. With our professional R&D team, we can develop and produce more than 2700 proteins each year.

multiple protein options

11. Multiple Delivery Form

  • Liquid Form

    The default delivery form is liquid form. If the customer has demand for lyophilized form, please remark this requirement when placing order.

  • Lyophilized Powder

    Relatively speaking, the lyophilized form will be more stable than the liquid form, and the shelf life will be longer. But lyophilization may have damage to protein structure, and may affect activity of some proteins.

Additional services

1. Tag Removal Service

  • If you need to remove the tag, please communicate with us in advance, otherwise, we won't remove the tag.
  • Not all protein tags can be removed as some proteins will be very unstable after tag removal.
  • If we succeed in removing the tag, we will charge for certain extra cost.
  • If we fail in removing the tag, we won't charge for any extra cost.
  • Generally, the delivery time will be extended for 2-3 days.

2. Western Blot Service

  • We could offer Western Blot service for tag antibody free of charge. If customer has demand, please provide this this information when placing the order.
  • Generally, the delivery time will be extended for 2-3 days.
  • WB detection result will be shown in COA.

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301-363-4651 (Available 9 a.m. to 5 p.m. CST from Monday to Friday)
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7505 Fannin St., Ste 610, Room 7 (CUBIO Innovation Center), Houston, TX 77054, USA
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