Mammalian Expression System

Optimized for complex proteins and post-translational modifications

The mammalian expression system is a preferred platform for incorporating non-canonical amino acids (ncAAs) into proteins that require complex folding patterns, authentic post-translational modifications, and native-like processing. Mammalian cells such as HEK293 and CHO provide a physiological environment that closely replicates human cellular conditions, supporting correct disulfide bond formation, glycosylation, phosphorylation, and other modifications essential for protein stability and bioactivity. This makes the system particularly valuable for antibodies, membrane proteins, secreted proteins, and biopharmaceutical candidates.

At Alfa Chemistry, our mammalian ncAA incorporation services utilize genetic code expansion technology with engineered orthogonal tRNA/aminoacyl-tRNA synthetase (aaRS) pairs that function independently of the host's translational machinery. These systems enable high-fidelity, site-specific insertion of ncAAs at designated codon positions, with minimal impact on endogenous protein synthesis. This approach allows precise control over a protein's chemical composition, creating opportunities for bioconjugation, fluorescence labeling, cross-linking, stability enhancement, and activity modulation.

Key Features of Our Service

Broad ncAA Portfolio: Multiple reactive, photo-activatable, isotopically labeled, and bioorthogonal ncAAs available.
Custom Site Selection: Strategic codon placement for functional group introduction at critical structural or functional sites.
Optimized Host Systems: Tailored HEK293 or CHO cell lines for varied expression requirements.
Integrated Workflow: From vector construction and transfection to protein expression, purification, and analysis.
Rigorous Quality Control: LC-MS, SDS-PAGE, Western blot, and functional assays to confirm ncAA incorporation and protein integrity.

Typical Applications

✅ Antibody–Drug Conjugates (ADCs): Site-specific incorporation of reactive ncAAs for controlled drug–antibody ratios.

✅ Protein Labeling: Precise fluorescent or affinity labeling for imaging, tracking, and interaction studies.

✅ Structural and Mechanistic Studies: Use of photo-crosslinkers or NMR-active ncAAs to investigate protein dynamics.

✅ Therapeutic Enhancement: Introduction of ncAAs to improve stability, solubility, or pharmacokinetics.

By integrating precise ncAA incorporation with the advanced capabilities of mammalian expression, Alfa Chemistry offers a powerful solution for protein engineering projects requiring both chemical versatility and biological authenticity.