Source 1review2021Chemical Science
Toolkit/constrained peptides
constrained peptides
Taxonomy: Mechanism Branch / Architecture. Workflows sit above the mechanism and technique branches rather than replacing them.
Summary
The development of constrained peptides represents an emerging strategy to generate peptide-based PPI inhibitors, typically mediated by α-helices.
Usefulness & Problems
Why this is useful
Constrained peptides are peptide constructs engineered with a conformational constraint to act as protein-protein interaction inhibitors, often in α-helical formats. The review frames them as a strategy for modulating difficult intracellular interaction surfaces.; generating peptide-based inhibitors of protein-protein interactions; stabilizing α-helix-mediated binding motifs; improving peptide affinity, stability, and cellular penetration
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Constrained peptides are peptide constructs engineered with a conformational constraint to act as protein-protein interaction inhibitors, often in α-helical formats. The review frames them as a strategy for modulating difficult intracellular interaction surfaces.
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generating peptide-based inhibitors of protein-protein interactions
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stabilizing α-helix-mediated binding motifs
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improving peptide affinity, stability, and cellular penetration
Problem solved
They are intended to improve the tractability of peptide-based PPI inhibition by increasing affinity, stability, and cellular penetration. The design logic also aims to reduce entropic penalties and protease-sensitive conformations.; addresses the difficulty of therapeutically targeting protein-protein interactions with peptides; reduces conformational and proteolytic liabilities of unconstrained peptides
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They are intended to improve the tractability of peptide-based PPI inhibition by increasing affinity, stability, and cellular penetration. The design logic also aims to reduce entropic penalties and protease-sensitive conformations.
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addresses the difficulty of therapeutically targeting protein-protein interactions with peptides
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reduces conformational and proteolytic liabilities of unconstrained peptides
Problem links
addresses the difficulty of therapeutically targeting protein-protein interactions with peptides
LiteratureThey are intended to improve the tractability of peptide-based PPI inhibition by increasing affinity, stability, and cellular penetration. The design logic also aims to reduce entropic penalties and protease-sensitive conformations.
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They are intended to improve the tractability of peptide-based PPI inhibition by increasing affinity, stability, and cellular penetration. The design logic also aims to reduce entropic penalties and protease-sensitive conformations.
reduces conformational and proteolytic liabilities of unconstrained peptides
LiteratureThey are intended to improve the tractability of peptide-based PPI inhibition by increasing affinity, stability, and cellular penetration. The design logic also aims to reduce entropic penalties and protease-sensitive conformations.
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They are intended to improve the tractability of peptide-based PPI inhibition by increasing affinity, stability, and cellular penetration. The design logic also aims to reduce entropic penalties and protease-sensitive conformations.
Taxonomy & Function
Primary hierarchy
Mechanism Branch
Architecture: A reusable architecture pattern for arranging parts into an engineered system.
Mechanisms
conformational pre-organizationConformational Uncagingentropic cost reduction upon bindingshielding of hydrophilic amides from the hydrophobic membranesuppression of protease-compliant β-strand conformationsTechniques
Computational DesignTarget processes
No target processes tagged yet.
Implementation Constraints
cofactor dependency: cofactor requirement unknownencoding mode: genetically encodedimplementation constraint: context specific validationoperating role: actuatorswitch architecture: uncaging
Implementation requires a peptide sequence and a constraining chemistry that enforces a preferred conformation. The abstract supports use across multiple constraining chemistries and targets but does not specify a single required platform.; requires introduction of a conformational constraint; is typically applied to α-helix-mediated PPI inhibitor designs
The review notes that adding a constraint does not guarantee a simple benefit, because it can also alter binding dynamics, recognition mode, and other molecular properties. Thus constraint insertion alone does not fully predict successful function.; introducing a constraint can also change binding dynamics; introducing a constraint can alter the mode of recognition; molecular-property consequences are more subtle than simple preorganization
Validation
Cell-freeBacteriaMammalianMouseHumanTherapeuticIndep. Replication
Supporting Sources
Ranked Claims
Constraint insertion can also produce subtler effects, including changes in binding dynamics, mode of recognition, and molecular properties.
The design rationale for constrained peptides is that pre-organization can pay the entropic cost of binding, reduce adoption of protease-compliant β-strand conformations, and shield hydrophilic amides from the hydrophobic membrane.
Introducing a conformational constraint into peptide PPI inhibitors can enhance affinity, stability, and cellular penetration.
Constrained peptides are an emerging strategy for generating peptide-based inhibitors of protein-protein interactions, typically through α-helix-mediated designs.
Approval Evidence
1 source4 linked approval claimsfirst-pass slug constrained-peptides
The development of constrained peptides represents an emerging strategy to generate peptide-based PPI inhibitors, typically mediated by α-helices.
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design caveatsupports
Constraint insertion can also produce subtler effects, including changes in binding dynamics, mode of recognition, and molecular properties.
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mechanistic rationalesupports
The design rationale for constrained peptides is that pre-organization can pay the entropic cost of binding, reduce adoption of protease-compliant β-strand conformations, and shield hydrophilic amides from the hydrophobic membrane.
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property effectsupports
Introducing a conformational constraint into peptide PPI inhibitors can enhance affinity, stability, and cellular penetration.
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review summarysupports
Constrained peptides are an emerging strategy for generating peptide-based inhibitors of protein-protein interactions, typically through α-helix-mediated designs.
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Comparisons
Source-stated alternatives
The abstract contrasts constrained peptides implicitly with unconstrained peptide inhibitors. It also notes that multiple constraining chemistries exist rather than a single universal solution.
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The abstract contrasts constrained peptides implicitly with unconstrained peptide inhibitors. It also notes that multiple constraining chemistries exist rather than a single universal solution.
Source-backed strengths
can enhance affinity; can enhance stability; can enhance cellular penetration; can pre-organize peptides for binding
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can enhance affinity
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can enhance stability
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can enhance cellular penetration
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can pre-organize peptides for binding
Compared with alpha-helical domain linker
constrained peptides and alpha-helical domain linker address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Compared with KnChR
constrained peptides and KnChR address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Strengths here: looks easier to implement in practice; may avoid an exogenous cofactor requirement.
Compared with SPACECAT
constrained peptides and SPACECAT address a similar problem space.
Shared frame: same top-level item type; shared mechanisms: conformational_uncaging
Strengths here: looks easier to implement in practice.
Ranked Citations
- 1.