Source 1primary paper2025MED
Toolkit/self-assembled proteomimetic
self-assembled proteomimetic
Also known as: SAP
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
Self-assembled proteomimetic (SAP) is a multi-component binding scaffold built from short PNA-peptide conjugates that assemble into a proteomimetic three-helix-bundle-like architecture. In the cited study, SAPs were generated against HER2 and the SARS-CoV-2 spike receptor-binding domain, and an RBD-targeting SAP inhibited viral entry with an IC50 of 2.8 nM.
Usefulness & Problems
Why this is useful
SAP provides an antibody-like binding modality from short, self-assembling PNA-peptide components rather than a conventional folded protein scaffold. The reported system is useful because its affinity can be chemically regulated through toehold-mediated displacement of the hybridizing PNA elements, enabling externally controlled binding.
Source:
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
Problem solved
SAP addresses the problem of creating high-affinity, target-specific binders from compact synthetic components that can be assembled and regulated post-assembly. The cited work specifically demonstrates target engagement for HER2 and SARS-CoV-2 RBD and shows chemical control over binding through disruption of the assembly-stabilizing PNA interaction.
Source:
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
Published Workflows
Self-assembled proteomimetic (SAP) with antibody-like binding from short PNA-peptide conjugates.
2025Objective: Create synthetically accessible antibody-like binders by assembling self-assembled proteomimetics from short PNA-peptide conjugates and discover target-specific binders through combinatorial preparation and affinity selection.
Why it works: The workflow couples T-NCL, which dramatically accelerates ligation at low micromolar concentrations, with one-operation preparation of small SAP libraries that can be directly subjected to affinity selection and LC-MS identification of the fittest binders.
hybridization-enforced two-helix coiled-coil formationtemplated native chemical ligation of PNA-peptide conjugatestoehold displacement-mediated disruption of coiled-coil stabilizationtemplated native chemical ligationcombinatorial library preparationaffinity selectionLC-MS analysis
Stages
- 1.Combinatorial SAP library preparation(library_build)
This stage creates small combinatorial SAP libraries that can be used directly in downstream affinity selections.
Selection: Preparation of small combinatorial libraries of SAPs in one operation
- 2.Affinity selection against target of interest(selection)
This stage enriches the library for binders to the target of interest before analytical identification.
Selection: Binding to a target of interest
- 3.LC-MS analysis of fittest binders(secondary_characterization)
This stage identifies the fittest binders after selection.
Selection: Analysis of the fittest binders recovered from affinity selection
Steps
- 1.Assemble SAPs from PNA-peptide conjugates by templated native chemical ligationengineered binder platform and enabling assembly chemistry
Generate SAP constructs in a combinatorial fashion from short synthetic components.
Assembly must occur first to create the SAP library that will be subjected to affinity selection.
- 2.Use the SAP library directly in affinity selections against a target of interestscreened binder library
Enrich for SAP binders that best recognize the target of interest.
Selection follows library preparation because only assembled SAP variants can be tested for target binding.
- 3.Analyze the fittest binders by LC-MSanalytical readout method
Identify the fittest binders recovered from affinity selection.
LC-MS analysis is performed after selection because it reads out the enriched binder set rather than the starting library.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A composed arrangement of multiple parts that instantiates one or more mechanisms.
Mechanisms
allosteric regulationconformational uncagingConformational Uncaginghybridization-enforced coiled-coil stabilizationtoehold-mediated strand displacementTarget processes
selectionInput: Chemical
Implementation Constraints
SAPs are described as assemblies of short PNA-peptide conjugates in which hybridizing PNA segments enforce stabilization of two-helix coiled coils to mimic a three-helix bundle. The reported control mechanism uses toehold-mediated strand displacement to disrupt the hybridizing PNAs and thereby modulate affinity; no additional expression, cofactor, or delivery details are provided in the supplied evidence.
The supplied evidence is limited to a single 2025 source and two explicit claims, so breadth of validation across targets, cell types, and in vivo settings is not established here. Practical performance details such as stability, delivery, immunogenicity, reversibility kinetics, and manufacturing robustness are not provided in the supplied evidence.
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
IC50 2.8 nM
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
binding affinity picomolar affinities
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
T-NCL dramatically accelerates ligation and enables combinatorial chemistry at low micromolar concentrations.
concentration regime low micromolar concentrations
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
longest synthetic peptide length 30 amino acids
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Approval Evidence
1 source6 linked approval claimsfirst-pass slug self-assembled-proteomimetic
Herein, we report a strategy, coined self-assembled proteomimetic (SAP), to mimic such three-helix bundle architecture with a hybridization-enforced two-helix coiled coil that is obtained by templated native chemical ligation (T-NCL) of PNA-peptide conjugates.
Source:
allosteric regulationsupports
SAP affinity can be allosterically regulated by toehold displacement of the hybridizing PNAs, which disrupts coiled-coil stabilization.
Source:
application performancesupports
An RBD-targeting SAP effectively inhibits SARS-CoV-2 viral entry with an IC50 of 2.8 nM.
Source:
binding performancesupports
The SAP design paradigm is functional for structurally distinct three-helix peptides aimed at HER2 and spike RBD, reaching picomolar affinities.
Source:
strategy descriptionsupports
SAP is a strategy to mimic three-helix bundle architecture using a hybridization-enforced two-helix coiled coil obtained by templated native chemical ligation of PNA-peptide conjugates.
Source:
synthetic accessibilitysupports
The SAP strategy reduces the length of the longest synthetic peptide to less than 30 amino acids, making it readily attainable by standard SPPS methodologies.
Source:
workflow capabilitysupports
Small combinatorial libraries of SAPs can be prepared in one operation and used directly in affinity selections with LC-MS analysis of the fittest binders.
Source:
Comparisons
Source-backed strengths
The cited study reports picomolar binding affinity for SAP binders and demonstrates functional antiviral activity for an RBD-targeting SAP with an IC50 of 2.8 nM in a viral entry assay. A further strength is that SAP affinity is allosterically regulated by toehold displacement of the hybridizing PNAs, linking target binding to a programmable nucleic-acid-like control input.
Ranked Citations
- 1.