Modified Peptides Binding Bacterial Beta Clamp Hydrophobic Pocket
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current approaches lack effective compounds that can bind with high affinity to the hydrophobic pocket of the β clamp, a crucial protein involved in bacterial and eukaryotic DNA replication, which is essential for developing new antibacterial or anticancer drugs.
Innovation Solution
Design and synthesis of specific peptides with modified structures that bind to the β clamp's hydrophobic pocket, such as the peptide P6 (AcQLDLF) and its derivatives, which exhibit improved affinity by two orders of magnitude, reaching 10^-8 M range, using structure-based strategies and biochemical methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural ligands are used to bind to the β ring pocket, then the interaction is specific, but the binding affinity is insufficient (10^-5 M range)
Solution Approach 1:
The patent modifies the natural ligand sequence by introducing non-natural amino acids and changing residue properties at specific positions to optimize binding affinity. The ligand sequence is systematically varied (e.g., positions 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100) to achieve high-affinity binders in the 10^-8 M range while maintaining specificity for the β ring pocket.
Solution Approach 2:
The patent creates composite peptide structures combining natural and non-natural amino acids in specific sequences. These composite ligands integrate the binding capabilities of natural peptides with the enhanced affinity and stability provided by non-natural residues, achieving both high specificity and high affinity simultaneously.
2Reliability
If peptide sequences are modified to improve binding affinity, then affinity increases by two orders of magnitude, but the complexity of ligand design increases
Solution Approach 1:
The patent applies local modifications to specific positions in the peptide sequence rather than redesigning the entire molecule. By targeting specific residues (positions 2, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100) for optimization, the patent achieves high affinity while maintaining overall structural simplicity and recognizability as a peptide ligand.
3Reliability
If high-affinity binders are developed for antibacterial or anticancer applications, then therapeutic potential increases, but the difficulty of obtaining crystal structures for validation increases
Solution Approach 1:
The patent uses computational modeling and molecular docking to predict and validate ligand-protein interactions before experimental crystallography. By creating virtual models of the ligand-β ring complex and analyzing interaction energies and geometric fit, the patent can validate binding modes and optimize ligands without immediately attempting crystal structure determination, thereby reducing the difficulty of obtaining valid crystal structures.
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 modified peptides demonstrate enhanced binding efficiency and potential as lead compounds for new antibiotic or anticancer agents by effectively interacting with the β clamp, inhibiting its interaction with other proteins.
Implementation Method 1
a deep leucine-rich hydrophobic pocket (subsite 1) located between sub-domains two and three of the β monomer
Data Source
AI summary
The present invention relates to compounds which bind to the hydrophobic pocket of the β clamp, i.e., to the surface of the β ring with which said protein interacts with other proteins of the bacterial replication complex during DNA replication. These compounds are derived from the acetylated peptide AcQLDLF (P6) to improve their affinity to their target.