Evolved Sortase Enzymes for Broad Substrate Specificity
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Solution Overview
Problem
Current bond-forming enzymes, such as naturally occurring sortases, have limited substrate specificity and efficiency, restricting their application in biological systems, as they are often selective for specific recognition motifs and exhibit low reaction efficiencies.
Innovation Solution
The development of evolved sortases using yeast display, enzyme-mediated bioconjugation, and fluorescence-activated cell sorting to isolate cells expressing proteins that catalyze the coupling of target substrates, allowing for the evolution of enzymes with improved catalytic activity and altered substrate preferences, enabling broader application of bond-forming reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If naturally occurring sortases are used, then substrate specificity is maintained, but reaction efficiency is low
Solution Approach 1:
The patent applies parameter changes by systematically mutating specific amino acid residues in the sortase active site (particularly positions 94, 106, 122, 154, 160, 165, 174, 190, and 196) to alter substrate recognition and improve catalytic efficiency. This directed evolution approach changes the chemical parameters of the enzyme to achieve both higher productivity and adapted substrate specificity.
Solution Approach 2:
The patent employs dynamics by creating a library of sortase variants with different mutation combinations and using yeast display to dynamically select for enzymes that exhibit both improved reaction efficiency and desired substrate specificity. The system allows dynamic optimization of enzyme properties through iterative selection rounds.
2Productivity
If sortase recognition motifs are engineered onto target proteins, then bond-forming reactions can be performed, but protein structure and function may be disturbed
Solution Approach 1:
The patent changes the parameter of substrate recognition by evolving sortases that recognize alternative sequences or modified versions of the canonical LPXTG motif. This allows bond-forming reactions to proceed while using shorter or modified tags that are less likely to disrupt protein structure and function.
Solution Approach 2:
The patent extracts the essential recognition elements from the full LPXTG motif to create minimal tags that maintain enzyme recognition capability while reducing structural interference. By identifying and utilizing only the critical residues for enzyme binding, the approach minimizes the impact on target protein integrity.
3Adaptability or versatility
If the spectrum of bond-forming reactions is expanded, then application scope increases, but enzyme selectivity decreases
Solution Approach 1:
The patent applies local quality by making specific, localized changes to the sortase active site residues rather than global modifications. Each mutation is strategically positioned to enhance recognition of specific substrate variations while maintaining overall enzyme selectivity. This localized optimization allows expanded reaction spectrum without sacrificing manufacturing precision.
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 evolved sortases demonstrate up to a 140-fold increase in transpeptidation activity compared to wild-type enzymes, facilitating efficient conjugation of diverse substrates and expanding the scope of bond-forming reactions in biological systems.
Implementation Method 1
integrates yeast display, enzyme-mediated bioconjugation, and fluorescence-activated cell sorting
Implementation Method 2
enzyme-mediated bioconjugation to isolate cells expressing proteins that catalyze the coupling of two target substrates
Implementation Method 3
several variants of S. aureus sortase A were evolved that exhibited up to a 140-fold increase in transpeptidation activity
Implementation Method 4
integrates yeast display, enzyme-mediated bioconjugation, and fluorescence-activated cell sorting
Data Source
AI summary
Strategies, systems, methods, reagents, and kits for the directed evolution of bond-forming enzymes are provided herein. Evolution products, for example, evolved sortases exhibiting enhanced reaction kinetics and/or altered substrate preferences are also provided herein, as are methods for using such evolved bond-forming enzymes. Kits comprising materials, reagents, and cells for carrying out the directed evolution methods described herein are also provided.