Fragment-Based Polypeptide Targeting Construct for Gas-Filled Microvesicles
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Solution Overview
Problem
Current gas-filled microvesicles used for diagnostic and therapeutic purposes, particularly those targeting P-selectin, face challenges in binding efficacy and stability, especially when using full-length P-selectin glycoprotein ligand-1 (PSGL-1) proteins.
Innovation Solution
Development of a construct comprising an amphiphilic compound associated with a polypeptide sequence of up to 200 amino acids, specifically a fragment of the P-selectin glycoprotein ligand-1 protein, which is dimeric and covalently bonded, enhancing binding efficacy and stability in aqueous suspensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-length P-selectin glycoprotein ligand-1 (PSGL-1) proteins are used as targeting ligands on gas-filled microvesicles, then the microvesicles can target P-selectin, but the binding efficacy and stability are insufficient
Solution Approach 1:
The full-length PSGL-1 protein is segmented into smaller functional fragments (amino acids 1-47, 1-88, or 46-88) that retain P-selectin binding capability. This segmentation reduces the polypeptide length from the full protein size to approximately 47-88 amino acids, improving binding efficacy while reducing complexity and enhancing stability in aqueous suspensions.
Solution Approach 2:
The invention extracts and utilizes only the essential P-selectin binding domain (amino acids 1-47 or extended to 1-88 or 46-88) from the full-length PSGL-1 protein. This extraction of the functional core eliminates unnecessary portions of the protein, resulting in more effective and stable targeting ligands that maintain specificity while reducing overall molecular complexity.
2Reliability
If full-length P-selectin glycoprotein ligand-1 (PSGL-1) proteins are used as targeting ligands on gas-filled microvesicles, then the microvesicles can target P-selectin, but the stability in aqueous suspensions is insufficient
Solution Approach 1:
The PSGL-1 protein is segmented into stable functional fragments (amino acids 1-47, 1-88, or 46-88) that maintain structural integrity in aqueous suspensions. This segmentation eliminates unstable regions present in the full-length protein, resulting in fragments that demonstrate improved stability while maintaining P-selectin binding capability.
3Manufacturing precision
If fragment-based polypeptide constructs are used to improve binding efficacy, then targeting precision improves, but manufacturing complexity increases
Solution Approach 1:
The PSGL-1 protein is segmented into defined functional fragments (amino acids 1-47, 1-88, or 46-88) with clear boundaries and well-characterized structures. This segmentation provides precise manufacturing targets that can be produced using standardized recombinant expression methods, actually simplifying production compared to handling full-length proteins while maintaining high targeting precision.
Solution Approach 2:
The invention focuses on producing only the essential P-selectin binding domain (amino acids 1-47 or extended regions) with high purity and defined structure. This local quality approach concentrates manufacturing resources on the critical functional region, improving targeting precision while streamlining production processes by eliminating the need to produce and characterize the entire full-length protein.
Data Source
AI summary
Gas-filled microvesicles associated with a polypeptide comprising a sequence of amino acids, said sequence exhibiting binding affinity for selectins, particularly p-selectin. The polypeptide is associated to the microvesicle in the form of a targeting construct comprising said polypeptide covalently bound to an amphiphilic compound. The gas-filled microvesicles can be used in ultrasound imaging.