Insect Cell Expression Service

The insect cell expression system generally refers to the Baculovirus Expression Vector System (BEVS), which achieves high-level expression of target proteins by infecting insect cells such as Sf9, Sf21 and High Five with baculoviruses. This system is highly suitable for expressing large proteins, multi-domain proteins, complex proteins, secreted proteins, viral proteins, certain membrane proteins and proteins with strict folding requirements. Compared with prokaryotic expression systems, insect cells provide an eukaryote-like folding environment, leading to higher expression success rates and better functional consistency of target proteins.

Yes, the expression yield in insect cells is affected by multiple factors, including multiplicity of infection (MOI), infection timing, cell density, cell culture status, harvest window, and intrinsic protein stability. We routinely boost protein production by optimizing infection parameters and expression time windows. Meanwhile, we adjust tag design, construct layout and secretion expression strategies according to individual protein properties. For hard-to-express proteins, small-scale condition screening can rapidly identify optimal expression protocols to improve delivery success rate and overall efficiency.

Proteins expressed by insect cells generally possess favorable structural integrity and functional activity for most research applications, and are suitable for binding assays, antibody screening, immunoassays, structural studies, protein-protein interaction analysis and other experiments. However, if your project has specific requirements for glycosylation patterns (such as functions heavily dependent on native mammalian glycoforms), we recommend clarifying your downstream applications at the pre-sales stage. We will then evaluate whether a mammalian expression system is required to make the protein better match your end-use demands.

Insect cell expression has unique advantages for membrane protein production, especially for certain membrane proteins, receptor proteins and viral envelope proteins. Nevertheless, membrane protein expression is inherently challenging; the success rate is closely linked to the number of transmembrane domains, construct design, expression formats (truncated/fusion variants) and purification workflows. We typically adopt a strategy of parallel small-scale construct screening to maximize the chance of identifying expressible, purifiable and stable constructs, thus elevating the overall project success rate.