Modified Viral H Polypeptide Reduces SLAM Binding
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Solution Overview
Problem
Current viral therapies for cancer, such as those using measles virus, often cause immune suppression due to high SLAM-dependent cell entry, leading to treatment-related toxicity and reduced efficacy.
Innovation Solution
Development of modified viral hemagglutinin (H) polypeptides with reduced SLAM binding capability, encoded by nucleic acids with specific mutations, which are incorporated into viruses to reduce immune suppression while maintaining the ability to infect CD46+ cells and produce new virus particles, thereby targeting and treating cancer cells without causing immunosuppressive activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wild type viral H polypeptides are used, then the virus can effectively infect cells, but immune suppression occurs due to high SLAM binding capability
Solution Approach 1:
The patent applies parameter changes by modifying specific amino acid residues in the H polypeptide sequence (e.g., positions 431, 451, 481, 527, 529, 530, 533, 553) to alter the SLAM binding capability. These sequence modifications change the interaction parameters between the viral H polypeptide and cellular SLAM receptors, reducing immune suppression while preserving infection capability through alternative CD46-dependent pathways
Solution Approach 2:
The patent applies local quality by making specific localized modifications to the H polypeptide structure at key binding regions while leaving other functional domains intact. This allows the virus to maintain essential functions (cell entry via CD46, replication) while locally reducing harmful SLAM-dependent immune suppression in the receptor binding interface
2Object-generated harmful factors
If SLAM binding capability is reduced, then immune suppression is minimized, but the ability to infect cells may be compromised
Solution Approach 1:
The patent uses CD46 as an intermediary receptor to mediate viral cell entry in place of SLAM. By modifying the H polypeptide to reduce SLAM binding while maintaining or enhancing CD46 binding capability, the virus finds an alternative pathway for cell infection that does not trigger immune suppression, thus resolving the contradiction between reducing harm and maintaining function
Data Source
AI summary
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