Insect Cell Lysate (Sf-21/Sf-9) Cell-Free Protein Synthesis Service

The Insect Cell Lysate Cell-Free Protein Synthesis (CFPS) System , typically derived from Spodoptera frugiperda cells (Sf-21 or Sf-9), is an advanced platform used to synthesize functional eukaryotic proteins in vitro . This system bridges the gap between simple bacterial CFPS (high yield, no PTMs) and complex mammalian CFPS (high PTMs, lower yield), offering a highly active translation system with native folding components .

CD Biosynsis offers a specialized Insect Cell Lysate CFPS Service leveraging the robust machinery of insect cells. This system is particularly effective for large, multi-domain proteins, complex enzymes, and viral antigens that require high chaperone levels, efficient disulfide bond formation, and basic N-linked glycosylation (Man5GlcNAc2). It provides the speed and flexibility of cell-free expression while maintaining the structural fidelity often associated with baculovirus expression systems, making it an excellent tool for structural biology, vaccine development, and enzyme kinetics studies .

Highlights

Unique benefits of choosing the Insect Cell Lysate CFPS System:

• Superior Folding Capacity: Contains high levels of endogenous chaperones (e.g., BiP, calnexin) and Dsb enzymes, ideal for large, multi-subunit proteins and multi-cysteine proteins .
• Efficient Disulfide Bond Formation: The lysate naturally supports the oxidative environment required for correct disulfide bridge formation in secreted proteins and antibodies.
• Basic Eukaryotic PTMs: Capable of incorporating high-mannose N-linked glycosylation, which is suitable for many structural and functional studies, especially for viral proteins.
• High Yields & Stability: Often provides higher protein yields and greater template stability compared to traditional RRL or WGE systems.

Applications

Critical applications where Insect CFPS provides high structural fidelity and functionality:

Viral & Pathogen Antigen Production

Synthesis of highly conformational viral envelope proteins, often used for ELISA and diagnostic assays where native folding is critical.

Structural Biology Targets

Efficient production of large protein complexes, Toxins, and multi-domain receptors with native folding and high purity for Cryo-EM and X-ray crystallography.

Toxic & Difficult Proteins

Ideal for expressing highly cytotoxic proteins that cannot be produced using living Sf9 cells or other in vivo systems.

N-linked Glycosylation Studies

Use for targeted studies requiring high-mannose glycosylation or specific glycan engineering experiments.

Key Features & Comparisons

A comparison of the Insect Cell Lysate System to other CFPS platforms:

High Chaperone Content

Inherently rich in folding factors like HSP70 and BiP, promoting correct folding of multi-cysteine and multi-subunit proteins.

Integrated Microsome Function

Lysates maintain functional ER-derived microsomes for membrane insertion and disulfide bond formation.

Template Flexibility

Supports both linear DNA and capped mRNA templates, providing flexibility for time-sensitive projects.

Eukaryotic Ribosome Stability

Ribosomes are robust and provide sustained protein synthesis capability, often resulting in higher final yields than RRL.

Cost-Effectiveness at Scale

Balances the complex PTM capability of HEK293 systems with the relative cost-effectiveness and yield of WGE.