Membrane Protein Antibody Production Service
For most soluble proteins a full-length recombinant antigen can be produced and used to immunize directly. Multi-pass transmembrane proteins are different. Their transmembrane spans divide the primary sequence into segments separated across the membrane, so simply deleting those spans to make a soluble immunogen destroys the native conformation, while expressing the full-length protein at the level needed for immunization is hard because overproduction of a membrane protein often disrupts the host cell. A membrane protein antibody project therefore needs a strategy that presents the relevant region without depending on full-length overexpression.
We prepare membrane protein antibodies using approaches chosen for the target: designing soluble constructs from the accessible domains, immunizing with recombinant material, or — where presentation of the native state matters most — immunizing with intact cells that display the protein in its membrane context. Each route is selected to give the immune system a form of the target it can recognize while preserving the structure the antibody must ultimately bind.
What the Service Covers
- Target assessment – mapping the transmembrane topology and identifying which regions are accessible for antibody recognition.
- Soluble-domain design – building constructs from the extra- and intracellular loops or soluble portions most likely to carry a useful epitope.
- Recombinant preparation – producing the designed immunogen and confirming it before immunization.
- Whole-cell immunization option – presenting the protein in its native membrane environment when conformation is critical.
- Screening and validation – testing candidates against the target in the intended application.
Why Membrane Proteins Are Difficult
| Challenge | Consequence | How we address it |
| Transmembrane spans split the sequence | Deleting them loses native conformation | Design immunogens from native-accessible domains |
| Very low natural expression | Too little full-length protein for immunization | Avoid reliance on full-length overexpression |
| Overproduction stresses the host | Cell viability and yield drop | Use cell-display or domain-based routes |
| Conformation matters | Wrong epitope presented | Offer whole-cell immunization to show native state |
Preparation Strategies
- Soluble-domain design – the classic route, where the antibody is raised against an engineered soluble portion of the target.
- Recombinant protein immunization – immunizing with the produced construct, useful when a defined region is the focus.
- Whole-cell immunization – immunizing with cells that express the protein in their membrane, giving the immune system the native conformation and reducing the risk of losing critical epitopes.
Workflow
- Analyze the target – define topology and the regions most likely to yield a useful antibody.
- Select the route – choose domain design, recombinant material, or whole-cell presentation.
- Prepare the immunogen – build and verify the chosen antigen form.
- Immunize and screen – raise the response and test candidates against the target.
- Validate and deliver – confirm performance in the application and supply the antibody with data.
Applications
- GPCR and ion-channel research – antibodies against receptor and channel families that are frequent drug targets.
- Western blot and immunodetection – reagents confirmed to report the target in lysates.
- Cellular and tissue studies – antibodies for staining and localization of membrane proteins.
- Target confirmation – in a representative project, antibodies were raised against a twice-transmembrane mitochondrial protein and confirmed by western blot against organelle markers, illustrating the whole-cell route.
Why Work With Us
Membrane protein antibodies fail for reasons that soluble-protein antibodies do not, so we do not treat them as a variant of a standard project. We assess the topology first, pick the presentation route that preserves the epitope the assay needs, and — where conformation is decisive — use whole-cell immunization rather than forcing a soluble construct. The result is an antibody selected against the form of the target your experiment actually uses.
