Multimeric Polypeptide Assemblies for ESCRT-Mediated Cargo Delivery
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Solution Overview
Problem
Existing technologies lack efficient methods for producing multimeric assemblies that can encapsulate and deliver cargo molecules, such as proteins, nucleic acids, or small organic compounds, across cellular membranes using the ESCRT machinery for membrane scission and release.
Innovation Solution
The development of multimeric assemblies composed of oligomeric substructures with specific polypeptide domains (M, O, and L domains) that interact with lipid bilayers and recruit the ESCRT machinery for membrane scission, allowing encapsulation and release of cargo molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multimeric assemblies are designed with multiple polypeptide domains (M, O, L domains) to interact with lipid bilayers and recruit ESCRT machinery, then the delivery efficiency and cargo protection are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The polypeptide is divided into distinct functional domains (M domain for membrane interaction, O interface for oligomerization, L domain for ESCRT recruitment) that can independently perform specific functions. This segmentation allows each domain to be optimized for its specific role while maintaining overall assembly functionality.
Solution Approach 2:
The multimeric assembly integrates multiple functions into a single structure: cargo encapsulation, membrane attachment via M domain, self-assembly via O interface, and membrane scission via L domain. This multi-functionality reduces the need for separate delivery components.
2Stability of the object's composition
If multimeric assemblies are designed with specific oligomeric substructures and symmetry axes for stable self-assembly, then the assembly stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
While the overall assembly exhibits symmetry, the individual polypeptide sequence contains asymmetric amino acid compositions and domain arrangements that drive specific self-assembly pathways. The asymmetric distribution of hydrophobic, charged, and polar residues guides the formation of symmetric oligomeric structures.
Solution Approach 2:
The polypeptide sequence is optimized with specific amino acid compositions, charge distributions, and hydrophobicity patterns that promote spontaneous self-assembly into stable oligomeric structures with defined symmetry axes under physiological conditions.
3Adaptability or versatility
If the M domain is designed to non-covalently interact with lipid bilayers for membrane attachment, then the reversibility and cargo release capability are improved, but the binding strength and attachment stability may be reduced
Solution Approach 1:
The M domain employs dynamic, reversible non-covalent interactions (electrostatic, hydrophobic, van der Waals forces) with the lipid bilayer rather than permanent covalent bonding. This allows the assembly to attach to membranes for cargo delivery and then release when conditions change, providing temporal control over membrane association.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These assemblies enable efficient delivery of cargo molecules into target cells by forming enveloped multimeric assemblies that protect the cargo and facilitate membrane fusion, ensuring effective delivery and protection from degradation.
Implementation Method 1
The M domain, L domain, and O interface are not each present in a single naturally occurring protein... The one or more M domains are capable of non-covalently interacting with a lipid bilayer
Implementation Method 2
one or more polypeptide domain that is capable of effecting membrane scission and release of an enveloped multimeric assembly from a cell by recruiting the ESCRT machinery to the site of budding
Implementation Method 3
each oligomeric substructure comprises a plurality of proteins that self-interact around at least one axis of rotational symmetry
Implementation Method 4
efficient delivery of cargo molecules into target cells by forming enveloped multimeric assemblies that protect the cargo
Data Source
AI summary
The application discloses multimeric assemblies including multiple oligomeric substructures, where each oligomeric substructure includes multiple proteins that self-interact around at least one axis of rotational symmetry, where each protein includes one or more polypeptide-polypeptide interface (“O interface”); and one or more polypeptide domain that is capable of effecting membrane scission and release of an enveloped multimeric assembly from a cell by recruiting the ESCRT machinery to the site of budding by binding to one or more proteins in the eukaryotic ESCRT complex (“L domain”); and where the multimeric assembly includes one or more subunits comprising one or more polypeptide domain that is capable of interacting with a lipid bilayer (“M domain”), as well as membrane-enveloped versions of the multimeric assemblies.