Product Overview Data Sheet Protocol
pFB-CHIg-hG4e1 is a cloning vector that expresses the human IgG4 heavy chain constant region with S228P mutation. It is a constitutive mammalian expression vector designed to deliver exceptionally high levels of antibody expression. This circular vector features an enhanced, full-length CMV promoter and other expression elements that typically enable higher expression levels. It can be used in suspension-adapted cells, such as Expi293F™ and ExpiCHO™, for transient protein expression. Additionally, it can serve as a Geneticin®-selectable expression plasmid for engineering stable cell lines. The vector carries an ampicillin resistance gene.
Characteristics
Fc engineered human IgG1 expression with S228P mutation:
– Reduced Fab-arm exchange
Specifications of Antibody Expression Vector| Antibiotic Resistance | Ampicillin (AmpR) |
| Constitutive or Inducible System | Constitutive |
| Delivery Type | Transfection |
| Promoter | CMV |
| Product Type | Mammalian Expression Vector |
| Cloning Method | Restriction Enzyme (5’-AgeI; 3’-XhoI) or Homologous Assembly |
Contents & Storage
- 20 µg of pFB-CHIg-hG4e1 in Tris-EDTA buffer
- Store at -20°. Vectors are guaranteed stable for 6 months when properly stored.
Materials required for Fc engineered antibody generation
- pFB-CLIg-hk or pFB-CLIg-hl plasmid expressing the human kappa or lambda light chain.
Steps for Fc engineered antibody generation
- Cloning your heavy chain variable region (VH) into pFB-CHIg-hG4e1 vector to make heavy chain expression plasmid.
- Cloning your light chain variable region (VL) into pFB-CLIg-hk or pFB-CLIg-hl vector to make light chain expression plasmid.
- Co-transfecting both heavy chain and light chain expression plasmids into your desired mammalian cell (such as CHO, HEK293) for Fc engineered antibody production.
References
- Lee et al., 2019. Publisher Correction: An engineered human Fc domain that behaves like a pH-toggle switch for ultra-long circulation persistence. Nat. Commun. 10, 5461.
- Silva et al., 2015. The S228P mutation prevents In Vivo and In Vitro IgG4 Fab-arm exchange as demonstrated using a combination of novel quantitative immunoassays and physiological matrix preparation. J. Biol. Chem. 290, 5462–5469.
