Synzyme Polypeptide Electric Field Control Back-Attack
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Solution Overview
Problem
Existing synthetic polypeptides designed to mimic enzyme catalytic sites lack efficient catalytic properties due to ineffective turnover, primarily attributed to the back-attack problem where the nucleophile re-attacks the acyl-imidazole group before deacylation can occur.
Innovation Solution
Development of synthetic polypeptides 6 to 30 amino acids in length with strategically placed catalytic groups such as histidine, cysteine, and serine, and steric groups like phenylalanine, which can be enhanced by controlled external forces like electric fields to facilitate dynamic mechanistic movements for efficient catalysis and higher turnover rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If synthetic polypeptides are designed to mimic enzyme catalytic sites with catalytic groups in close proximity, then catalytic activity is improved, but back-attack occurs preventing turnover
Solution Approach 1:
The patent applies dynamic control by using external electric fields to modulate the conformation and proximity of catalytic groups in real-time. The system transitions from a static synthetic polypeptide structure to a dynamically controllable one, where the electric field can induce conformational changes that enable catalysis while preventing back-attack, thus resolving the contradiction between catalytic activity and turnover efficiency
Solution Approach 2:
The patent changes the physical parameter of the system by applying external electric fields to alter the electrostatic environment and spatial arrangement of catalytic groups. This parameter change allows the system to achieve both high catalytic activity and effective turnover by controlling the proximity and orientation of catalytic residues through field-induced conformational changes
2Speed
If catalytic groups are positioned in close proximity to enhance reaction rate, then catalytic efficiency is improved, but the nucleophile cannot be regenerated for turnover
Solution Approach 1:
The patent employs periodic application of external electric fields to create cyclic conformational changes in the synthetic polypeptide. During certain phases of the periodic cycle, catalytic groups are positioned for high reaction rate, while in other phases, the field induces conformational changes that facilitate product release and catalyst regeneration, enabling both fast reaction and sustained turnover
Solution Approach 2:
The system transitions from a fixed geometric arrangement to a dynamically adjustable one where external fields can temporarily enhance catalytic proximity for high reaction rates, then restore separation to enable turnover. This dynamic control allows the system to alternate between high-speed catalysis and regeneration phases
3Ease of manufacture
If simple synthetic peptide structures are used, then ease of manufacture is improved, but catalytic properties are insufficient
Solution Approach 1:
The patent replaces the need for complex mechanical/structural organization (like folded protein domains) with an external field-based control system. The simple linear peptide sequence is enhanced by applying external electric fields that induce the necessary spatial arrangements and dynamic behaviors, achieving high catalytic efficiency without complex manufacturing requirements
Solution Approach 2:
The patent makes the simple synthetic peptide multi-functional by combining it with external field control. The same simple peptide structure can be tuned to exhibit different catalytic behaviors and efficiencies through field application, allowing one simple structure to perform multiple catalytic functions that would otherwise require complex specialized 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 synthetic polypeptides demonstrate improved acetylation and deacylation rates, overcoming the back-attack issue and achieving higher catalytic efficiency by strategically positioning catalytic groups and applying external forces to modulate their proximity, thereby enhancing turnover rates.
Implementation Method 1
These synthetic polypeptides are believed to utilize one or more of the imidazole group of the histidine or histidine analog, the sulfhydryl/thiol group of the cysteine or cysteine analog, the hydroxyl group of the serine or serine analog, and/or the carboxyl group of aspartic acid or aspartic acid analog, to catalyze hydrolysis of amide or ester bond containing substrates
Implementation Method 2
catalyze hydrolysis of amide or ester bond containing substrates
Implementation Method 3
The catalytic properties of these synthetic catalytic structures can be further improved by the application of controlled external forces, e.g., electric fields
Implementation Method 4
application of controlled external forces, e.g., electric fields, optical, magnetic, acoustical, or mechanical force
Data Source
AI summary
Novel synthetic catalytic structures or “synzymes,” e.g., synthetic polypeptides, with catalytic properties are provided. It is believed that these synthetic catalytic structures mimic some of the precise conformational changes necessary for catalytic activities seen in enzymes. The catalytic properties of these synthetic catalytic structures or synzymes can be further improved by the application of controlled external forces, e.g., electric fields.