Human Antibody Library
Antibody library (AL) is established based the knowledge of phage, molecular biology and antibody engineering. HAL is a wonderful method to maintain the source antibody repertoire, at the same time increasing the possibility to find hard-to-get antibody. Human Antibody Library (huAL) provides a simple method to acquire human sequenced antibody. Even human origin antigen can be used to develop antibody, without any special procedure. Bio Bench has developed more than 20 human libraries in house, including naïve antibody library, semisynthetic library and synthetic library.
Advantages
- Human sequenced antibodies, no worry for immunogenecity in human related research.
- Large sequence diversity, comparable to nature format.
- Antibody affinity as good as sub nM.
- Simple fragmentation process, client may choose ScFv, F(ab)2, F(ab), full sequence IgG or bi-specific Ab.
- Animal free, no need to immunize any animal.
Service and Time Line |
Content |
Deliverables |
Price |
AB210306 Guaranteed Human antibody service 1 antibody 50 - 70 days |
1. Material: protein/peptide, to be provided by client. 2. Library culture and biopanning to find the best binders. 3. ELISA method to test the top binders, titer > 1:64000. 4. 1 selected antibody to be expressed into full length human IgG antibody (mammalian expression), following by purification. 5. QC: SDS-PAGE to test purity and MW. ELISA binding test. |
• 1 selected positive antibody: 3mg purified antibody. • Antibody purity: > 85%. • QC and Report. |
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AB210307 Guaranteed Human antibody service 3 different antibodies 50 - 70 days |
1. Material: protein/peptide, to be provided by client. 2. Library culture and biopanning to find the best binders. 3. ELISA method to test the top binders, titer > 1:64000. 4. 3 selected antibodies to be expressed into full length human IgG antibodies (mammalian expression), following by purification. 5. QC: SDS-PAGE to test purity and MW. ELISA binding test. |
• 3 selected positive antibodies: 3mg purified antibody for each antibody. • Antibody purity: > 85%. • QC and Report. |
Descriptions:
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Human Antibody Library - Background
Muromonab is the first clinical-use approved monoclonal antibody therapy in 1986 and the one of only four with full murine sequence. Since antibody became a major class of new drugs to treat cancer and autoimmune diseases, the disadvantages of murine-originated antibody has been extensively studied. Murine antibody has a short therapeutic half-life in human body, also it may cause allergic reaction to the patients. The reason is simple due to the murine antibody is recognized by the patient immune system as foreign proteins resulting in a human anti-mouse (HAMA) response.
Subsequently, how to generate humanized antibody sequence while keeping the affinity and specificity became an important challenge in therapeutic antibody drug development.
Seeking mAb directly from human (healthy/patient) is the most efficient solution to acquire drug-potential antibody, compare to humanization of an animal antibody. In the past due to the limitation of methods, it was impossible to bring this technology out of lab and enter into the industry. Developed together with phage knowledge and modern molecular biology, phage display technology enabled the possibility of mega protein library and protein engineering. Thanks to phage display technology, we are able to acquire the antibodies from all of the animal species including human ourselves, through Human Antibody Library (huAL).
Subsequently, how to generate humanized antibody sequence while keeping the affinity and specificity became an important challenge in therapeutic antibody drug development.
Seeking mAb directly from human (healthy/patient) is the most efficient solution to acquire drug-potential antibody, compare to humanization of an animal antibody. In the past due to the limitation of methods, it was impossible to bring this technology out of lab and enter into the industry. Developed together with phage knowledge and modern molecular biology, phage display technology enabled the possibility of mega protein library and protein engineering. Thanks to phage display technology, we are able to acquire the antibodies from all of the animal species including human ourselves, through Human Antibody Library (huAL).
Human Antibody Library - Different Types
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Human antibody library can be classified into several different types, according to the source of the sequence: immune library, naïve library, semi-synthetic library and synthetic library. The table hereunder briefly summarized the difference among these different types. The technology has been well developed so we shall expect good outcome from any type of the library.
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immune Library |
Naïve library |
Semi-synthetic Library |
Synthetic Library |
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Source of the sequence |
Animal immunized by specific antigen, or patient |
Non-immunized animal or human |
Non-immunized animal or human, together with partially artificial sequence |
Artificial sequence |
Affinity maturated |
Yes |
No |
No |
No |
Diversity |
Low |
High |
High |
Very high |
Highlighted Antibody Library – Human Naive antibody Library (100-HuAb)
To meet the improving demand from the bio-pharma industry, Bio Bench started to design and build its own 100-billion Human Naïve Antibody Library (100-HuAb) for drug discovery. By adopting the PBMCs from 3000 healthy donors’, the size of the human naive antibody library finally reaches 220-billion clones which covering all of the antigens (10-million different types in theory). The 100-HuAb shows high germlines diversity and CDR-H3/CDR-L3 sequence diversity which is similar to nature antibody (data from IMGT database).
Benefits and advantages
1. Full human sequence antibody, start your project with original format.
2. Low cost and reduced risk.
3. Fast, 30 - 45 days you will receive your antibody.
4. Large amount of candidate clones, up to 300+.
Specifications of the 100-HuAb
3000 healthy donors
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100-billion clones
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3Rs compatible
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ScFv fragment
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Engineered for better performance
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Antibody gene diversity: a primary feature of the antibody library
Antibody sequence show high diversity among nature antibodies in all of the animal species. High sequence diversity brought higher possibility to find the right antibody for a unique antigen/epitope. To keep the diversity during naive antibody library requires leading technology and know-how technical team. Bio Bench launched a series of R&D to improve the quality of the library from the beginning, Results show the 100-HuAb is significantly high diverse in sequence.
Germlines diversity
In order to investigate the diversity of 100-HuAb, Bio Bench analyzed the sequence of antibody drugs from both approved list (till 2018) and clinical trial list (list from 2018). Data is show in Figures. The diversity of germline does not show a significant difference between 100-HuAb raised antibodies and antibody drugs.
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CDR length diversity
CDR region plays the key role in determining the affinity, specificity and druggability of antibodies. High viable CDR sequence is very important CDR-H3 and CDR-L3 length and sequence are the most viable fragments among all of the 6 fragments and CDR-H3 is even far more viable than CDR-L3.
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Case studies: the performances of 100-HuAb
On the platform of 100-HuAb, Bio Bench has already run 18 projects (including test projects) with therapeutic targets and 1711 clones are harvested. The amount of binders, affinity and the lead antibody functional assay are tested. Results are shown below.
Large amount of clones
The conventional hybridoma technology allows researcher to acquire 1-5 clones from each mouse and 100 mice may be killed for 300 binders with good affinity. 100-HuAb does not need any additional mouse which is totally complying with 3-R principal for animal experiment. Result shows average 100 clones will be harvested, more than 300 clones are possible under customer's demand.
High affinity
100-HuAb human naive antibody library is engineered and with 220-billion clones, then during biopanning process a large amount of clones can be harvested and the low affinity binders will be ignored. Therefore it will lead to a significantly increased amount of high affinity clones. Compare to the typical affinity range 50nM-200nM of other reported human naive antibody libraries, 17% of the binders harvested from 100-HuAb show high affinity in pM-10nM and nearly 50% of the clones are within 50nM.
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Project M is cytokine target. After biopanning, 6 clones are selected and tested affinity according to client’s demand. These 6 clones showing high affinity range from 1.75nM to 6.07nM. |
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All of the antibodies harvested from Project 039 and Project 056 are tested affinity. 4% of the antibodies show high affinity in pM level and totally 47% of the clones show affinity <50nM. |
