Hydrocarbon Stapled Peptides for Apoptosis Control
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Solution Overview
Problem
Current methods for manipulating apoptotic protein functions, such as inhibiting BAK BH3 domain interactions with BCL-XL, face challenges including low affinity compounds and limited specificity in high throughput screening, and peptide engineering struggles with maintaining helical structure and cellular penetration.
Innovation Solution
Cross-linking polypeptides with modified amino acids to stabilize alpha-helical conformation, enhancing resistance to proteolysis and hydrophobicity, and facilitating cellular uptake, allowing for specific binding to BCL-2 family proteins to promote or inhibit apoptosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If peptide engineering is used to manipulate apoptotic protein functions, then binding specificity can be improved, but maintaining helical structure and achieving cellular penetration becomes difficult
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of amino acid residues within the peptide sequence, specifically incorporating non-natural amino acids with hydrocarbon side chains that promote and stabilize alpha-helical conformation. This structural parameter modification enables the peptide to maintain its helical structure in aqueous environments while preserving binding specificity to apoptotic proteins.
Solution Approach 2:
The patent creates composite structures by combining natural amino acid sequences with non-natural amino acid residues containing hydrocarbon side chains. This composite approach integrates the binding specificity of naturally derived sequences with the structural stability and membrane-penetration capabilities of hydrocarbon-stabilized helices, achieving both specificity and reliability.
2Stability of the object's composition
If cross-linking with modified amino acids is used to stabilize alpha-helical conformation, then resistance to proteolysis and hydrophobicity increase, but cellular penetration may be affected
Solution Approach 1:
The patent applies local quality by strategically positioning hydrocarbon-containing amino acid residues at specific locations within the peptide sequence, particularly at positions that stabilize the helical backbone without blocking the hydrophobic face required for membrane interaction. This localized modification provides proteolytic resistance while preserving cellular penetration capability.
Solution Approach 2:
The patent modifies the hydrophobicity parameter of the peptide by incorporating non-natural amino acids with hydrocarbon side chains. This parameter change increases resistance to proteolysis by reducing accessibility to proteolytic enzymes while simultaneously enhancing membrane-penetration properties through increased hydrophobicity, thus resolving the apparent contradiction.
3Productivity
If high throughput screening is used to identify compounds, then productivity increases, but affinity and specificity of identified compounds decrease
Solution Approach 1:
The patent applies preliminary action by pre-stabilizing the alpha-helical conformation of the peptide through incorporation of hydrocarbon-containing amino acids before the screening process. This pre-organization of the bioactive conformation ensures that compounds identified through high-throughput screening inherently possess the structural requirements for high affinity and specificity, eliminating the need for subsequent structural optimization.
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
The cross-linked polypeptides demonstrate improved biological activity, increased binding affinity, and enhanced cellular penetration, effectively triggering or inhibiting apoptosis in cancer cells, with potential therapeutic applications.
Implementation Method 1
cross-linking a polypeptide predisposed to have an alpha-helical secondary structure can constrain the polypeptide to its native alpha-helical conformation
Implementation Method 2
The constrained secondary structure can increase resistance of the polypeptide to proteolytic cleavage
Implementation Method 3
the polypeptides can penetrate the cell membrane (e.g., through an energy-dependent transport mechanism, e.g., pinocytosis)
Implementation Method 4
the crosslinked polypeptides can be used to inhibit apoptosis. The cross-linked polypeptides described herein can be used therapeutically, e.g., to treat cancer in a subject
Data Source
AI summary
Novel polypeptides and methods of making and using the same are described herein. The polypeptides include cross-linking (“hydrocarbon stapling”) moieties to provide a tether between two amino acid moieties, which constrains the secondary structure of the polypeptide. The polypeptides described herein can be used to treat diseases characterized by excessive or inadequate cellular death.