Mammalian System Expression

Included in the package:

Steps in the process: Deliverables:
1. Cloning gene of interest- includes 1 optional tag of choice (GST, Fc, or 6XHis)
✓ 2 ug DNA
✓ Sequence chromatogram
2. Transfection and pooled expression
3. Purification (>90%)
✓ 1 mg of protein
SDS-PAGE image
4. QC analysis for endotoxin and mass spec ✓ Mass spec trace report
✓ LAL endotoxin report
5. QC conformational validation with 1 assay of choice (WB, or Bioassay) ✓ 1 assay report
Additional options (additional charges via quotation):
Product manipulations (tag cleavage, desalting, reformulation, aliquoting, lyophilization) Add’l LAL endotoxin report
Additional quantitation method (WB, ELISA, Bradford, A280) Add’l quantitation report
Additional purified material Available in increments of 1 mg or more
Additional conformational validation assay Add’l quality assay report
Clonal Development ✓ 3 x cryovials per clone
Time frame is 6-8 weeks for the package without additional options.


Mammalian cell systems currently available: CHO (HEK is also available to explore)

DNA Elements:

  • Promotors
  • Enhancers
  • Signal Peptides
  • Tags


Expression Capabilities:  Volumes that scale to 1L

Purification Capabilities:

  • Ion Exchange (S-Sepharose, CM-Sepharose, Q-Sepharose, DEAE Sepharose)
  • Hydrophobic Interaction Chromatography (Butyl Sepharose, Phenyl Sepharose)
  • Hydroxyapatite Chromatography
  • Heparin Purification
  • Affinity Purification


Quality Control Capabilities:

  • Mass spectroscopy – confirms MW of protein and can be used to determine multimeric status
  • Endotoxin analysis – Charles River PTS device measures endotoxin levels down to <0.05 EUs/ug
  • Western blotting - if antibodies are available
  • ELISA – if kits or antibodies are available
  • Bioassay -  See assay capabilities HERE