PRRSV GP5 Polypeptide Domain Combinations for Broad Immune Response
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Solution Overview
Problem
Developing an effective vaccine against porcine reproductive and respiratory syndrome (PRRS) virus is challenging due to its antigenic properties constantly changing, leading to difficulties in generating a broad immune response, as existing vaccines often rely on a single GP5 ectodomain, which is insufficient to protect against multiple virus isolates with different hypervariable regions.
Innovation Solution
The use of combinations of GP5 polypeptide domains with varying sequences in the HV2 hypervariable region, either alone or in recombinant viral particles, to stimulate a broader immune response by mimicking multiple virus isolates, thereby inducing neutralizing antibodies and providing protection against diverse PRRSV strains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single GP5 ectodomain is used in the vaccine, then the vaccine structure is simple and easy to manufacture, but the immune response is narrow and cannot protect against multiple virus isolates with different hypervariable regions
Solution Approach 1:
The GP5 ectodomain is divided into three distinct regions: HV-1 hypervariable region, conserved region, and HV-2 hypervariable region. By segmenting the ectodomain in this way, the invention enables selective combination of different regional sequences to create vaccine compositions that target multiple virus isolates while maintaining structural organization and manufacturability
Solution Approach 2:
The vaccine composition uses composite polypeptide structures that combine different sequences from HV-1, conserved, and HV-2 regions. These composite ectodomains integrate divergent sequence elements into a single functional unit, allowing the vaccine to elicit broad immune responses against multiple PRRSV isolates with different hypervariable region sequences
2Device complexity
If the vaccine targets only conserved regions, then the vaccine structure is simple, but the virus can easily evade immunity through mutations in hypervariable regions
Solution Approach 1:
Different regions of the ectodomain are assigned different functional qualities: HV-1 and HV-2 regions provide strain-specific recognition capabilities while the conserved region provides stable baseline immunity. This local differentiation allows the vaccine to simultaneously achieve simplicity in structure and reliability in protection by optimizing each region's contribution
Solution Approach 2:
The vaccine composition is designed in advance to include multiple ectodomain variants with different combinations of HV-1, conserved, and HV-2 region sequences. This preliminary incorporation of diverse sequence variants prepares the immune system to recognize multiple potential virus isolates before exposure occurs, preventing immune evasion
3Adaptability or versatility
If multiple GP5 ectodomains with different HV-2 sequences are combined in the vaccine, then the immune response becomes broader and more protective, but the vaccine complexity and manufacturing difficulty increase
Solution Approach 1:
The conserved region sequence serves as a universal foundation that is common across all ectodomain variants in the vaccine composition. This universal element provides structural consistency and simplifies manufacturing while the variable HV-1 and HV-2 regions provide the multi-functionality needed to target different virus isolates
Data Source
AI summary
The disclosure includes compositions and methods for the production of an immune response against porcine reproductive and respiratory syndrome (PRRS) virus, or PRRSV. The disclosure is based in part on the use of two or more peptide domains, each with a different sequence, from the PRRSV GP5 protein ectodomain. Compositions and methods comprising polypeptides containing the two or more domains, or nucleic acids encoding them, are described.