Virus-Like Particle (VLP) CDMO Solutions

Our organization delivers integrated contract development and manufacturing organization (CDMO) expertise specifically engineered for virus-like particle (VLP) applications. Leveraging profound biochemical and virological knowledge, we provide end-to-end solutions transforming innovative concepts into manufacturable products. Explore our broader capabilities in CDMO Solutions and specialized viral delivery platforms via Viral Vector CDMO Solutions.

VLP Design and Molecular Engineering

Our core competency lies in the rational design and engineering of VLP architectures. Utilizing advanced computational modeling, we predict and optimize protein folding, self-assembly kinetics, and structural stability. Expertise encompasses:

• Targeted Antigen Display: Strategic insertion of heterologous epitopes into surface loops of capsid proteins using genetic fusion or chemical conjugation strategies, ensuring optimal immunogenicity and conformational fidelity.
• Chimeric and Multimeric VLP Construction: Engineering complex VLPs incorporating multiple structural proteins from different viral origins or fusion proteins to achieve desired tropism, stability, or multifunctionality.
• Cargo Loading and Encapsulation: Designing VLPs for encapsulation of nucleic acids (mRNA, siRNA), small molecules, or enzymes via co-expression, in vitro loading, or pore-engineering techniques.
• Sequence Optimization & Codon Usage: Enhancing expression yields and fidelity in chosen host systems (baculovirus/Sf9, mammalian, yeast, E. coli) through codon harmonization and gene synthesis.

Upstream Process Development and Optimization

We establish robust, scalable platforms for VLP production. Services include:

• Host System Selection and Engineering: Evaluating and selecting optimal expression systems (mammalian, insect, yeast, bacterial) based on VLP complexity, glycosylation needs, and scalability. Developing stable cell lines or optimizing transient expression protocols.
• Cell Culture Optimization: Defining critical process parameters (CPPs) for growth media, feed strategies, temperature, pH, dissolved oxygen, and induction kinetics to maximize VLP yield and quality.
• Harvest and Clarification: Developing efficient primary recovery steps (depth filtration, centrifugation, flocculation) tailored to cell type and culture format, ensuring minimal product degradation.

Downstream Purification and Characterization

Purifying VLPs to high homogeneity with specialized techniques:

• Tangential Flow Filtration (TFF): Initial concentration and buffer exchange.
• Chromatographic Separation: Employing multimodal chromatography (ion exchange, affinity, size exclusion) to resolve VLP monomers from aggregates, misfolded species, and host cell contaminants.
• Analytical Ultracentrifugation (AUC) and SEC-MALS: Rigorously assessing size distribution, aggregation state, and molecular weight.
• Advanced Structural Characterization: Utilizing cryo-electron microscopy (cryo-EM), dynamic light scattering (DLS), and nanoparticle tracking analysis (NTA) to confirm structural integrity, size, and morphology.

GMP Manufacturing and Quality Control

Our state-of-the-art facilities support GMP manufacturing:

• Process Scale-up and Tech Transfer: Seamlessly transitioning bench-scale processes to large-scale bioreactors with rigorous comparability studies.
• In-Process Controls (IPC) & Release Testing: Implementing validated assays for identity, purity, potency, sterility, endotoxin, and adventitious agents throughout manufacturing.
• Stability Studies: Conducting real-time and accelerated stability studies under ICH guidelines to define shelf-life and storage conditions.