Custom Protein
Custom Protein & Peptide Service
Recombinant protein expression and purification, plus custom peptide synthesis - tailored from design to delivery. We help you generate high-quality proteins and peptides with confidence and consistency.
- E. coli, yeast, insect & mammalian expression
- LPPS & SPPS peptide synthesis
- Linear or cyclised, with modifications
- Expert support from design to delivery
Request a Custom Protein Quote
Share your protein or peptide sequence and project details — our scientific team replies within one business day.
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Recombinant Protein Expression
We select the expression system that fits your target - balancing yield, solubility, folding and post-translational modification requirements.
E. coli Expression
Fast, cost-effective production of small, soluble proteins.
- No post-translational modifications
- High yields
- Ideal for soluble targets
Yeast Expression
For glycosylated or secreted proteins of moderate complexity.
- Eukaryotic processing
- Secretion & glycosylation
- Scalable production
Insect Cell Expression
For complex eukaryotic proteins requiring functional activity.
- Baculovirus systems
- Complex folding
- Functional activity
Mammalian Expression
Biologically active proteins requiring native folding.
- Native folding
- Human-like glycosylation
- Therapeutic-grade quality
Custom Peptide Synthesis
From short linear sequences to cyclised peptides with advanced modifications, synthesised to your exact specification.
Peptide Synthesis
- Liquid-phase peptide synthesis (LPPS) to minimise side reactions
- Solid-phase peptide synthesis (SPPS) for longer peptides
- Linear to cyclised peptides per your requirements
Modifications
- Biotinylation for capture and detection
- Phosphorylation and other PTMs
- Dye labelling for imaging and assays
How It Works
Share your sequence and requirements - we handle design, optimization, synthesis, purification and QC, with expert support and regular updates throughout.
Feasibility
We review your peptide or protein sequence and project goals to assess technical feasibility.
Optimization
We optimise gene or peptide design - codons, tags and constructs - for expression, solubility and stability.
Production & Purification
We produce and purify your protein or peptide to the highest standards in the chosen system.
Validation
Final products undergo rigorous quality control and validation against your specifications.
What Researchers Are Saying
Trusted by researchers around the world.
Their products are of top quality, providing accurate and reliable results. The customer support is exceptional, always responsive and helpful.
— Ripon, verified reviewerAssay Genie has great customer service, and their products are excellent.
— Caroline, verified reviewerClear communication, very quick delivery, and the product worked exactly as described. I would do business here again.
— Darragh, verified reviewerWhy Choose Assay Genie
High-quality custom proteins and peptides backed by a scientific team that supports your project at every step.
Fast Delivery
7–10 business day lead time after manufacture.
Highly Cited
High-quality recombinant proteins and peptides trusted by researchers worldwide.
PhD-Level Support
Our team is trained to PhD level to support your protein and peptide design.
Discover Our Custom Services
Explore the full range of Assay Genie custom development services, built around your research goals.
Monoclonal, polyclonal, recombinant and nanobody antibodies for key research applications.
Tailored assay development for your unique targets, ideal for biomarker discovery.
High-throughput GeniePlex multiplex assay development for your research needs.
Fully engineered stable, knockout, knock-in and reporter cell lines built for your assay.
Frequently Asked Questions
What custom protein and peptide services do you offer?
We provide recombinant protein expression and purification along with custom peptide synthesis, covering everything from gene and sequence design through production, purification and quality control.
Which expression systems are available for recombinant proteins?
We express in E. coli (small, soluble proteins without post-translational modifications), yeast (glycosylated or secreted proteins of moderate complexity), insect cells (complex eukaryotic proteins needing functional activity) and mammalian cells (biologically active proteins requiring native folding and glycosylation).
What peptide synthesis options do you provide?
We offer liquid-phase peptide synthesis (LPPS) to minimise side reactions and solid-phase peptide synthesis (SPPS) for longer peptides, with linear or cyclised formats and modifications including biotinylation, phosphorylation and dye labelling.
How do you choose the right expression system?
During feasibility we review your sequence and goals, then recommend the system that best balances yield, solubility, folding and any post-translational modification requirements.
How does the custom protein process work?
Four stages: Feasibility (sequence and goal review), Optimization (codon, tag and construct design for expression, solubility and stability), Production & Purification (in the chosen system) and Validation (quality control against your specifications).
How do I start a custom protein or peptide project?
Share your protein or peptide sequence and requirements using the project form on this page, email info@assaygenie.com or orders@assaygenie.com, or call +353 1 563 9720.
Ready to Develop Your Custom Protein or Peptide?
Send our PhD-level team your sequence and goals, and we'll recommend the right expression system or synthesis strategy.
Discuss My Project Contact the Team