Engineered Phospholipase D Mutants for Membrane Lipid Editing
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Solution Overview
Problem
Current tools for manipulating lipid content in cellular membranes lack the molecular and spatiotemporal precision needed to effectively alter the properties and functions of membranes, particularly beyond the phosphoinositide sector.
Innovation Solution
Engineered phospholipase D (PLD) enzymes with enhanced catalytic activity, stability, and broader substrate scope, allowing for the chemoenzymatic synthesis of a wide array of natural and non-natural phospholipids via transphosphatidylation reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wild-type PLD is used for transphosphatidylation reactions, then the enzyme can catalyze the reaction, but the catalytic activity is low and insufficient for effective membrane editing
Solution Approach 1:
The patent applies parameter changes by systematically modifying amino acid residues at the enzyme-substrate interface and in the active site. Specific mutations (e.g., F177Y, F180Y, Y186W) were introduced to alter binding affinity and catalytic efficiency, achieving up to 100-fold increase in transphosphatidylation activity while maintaining enzyme stability through rational design and directed evolution approaches
2Productivity
If the PLD enzyme is engineered to have higher catalytic activity, then transphosphatidylation efficiency increases, but the enzyme may lose stability or specificity
Solution Approach 1:
The patent applies local quality by making targeted mutations specifically at the substrate binding interface and active site regions rather than global modifications. Mutations such as F177Y, F180Y, and Y186W were introduced locally to enhance binding affinity and catalytic efficiency for phosphatidylcholine substrates, while the rest of the enzyme structure remains unchanged to preserve overall stability
Solution Approach 2:
The patent employs feedback through iterative directed evolution cycles where enzyme variants are screened for improved transphosphatidylation activity, and the best performers are subjected to further mutagenesis. This feedback loop allowed progressive optimization of catalytic activity while monitoring and maintaining enzyme stability throughout the evolution process
3Measurement precision
If existing PLD tools are used for membrane lipid manipulation, then some lipid modification is possible, but the molecular and spatiotemporal precision is insufficient
Solution Approach 1:
The patent applies preliminary action by fusing the optimized PLD enzyme to light-sensitive domains (such as CRY2) that enable light-induced recruitment to specific membrane compartments. This allows the enzyme to be pre-positioned in an inactive state and then activated at specific locations and times through light stimulation, achieving precise spatiotemporal control before the catalytic action occurs
Solution Approach 2:
The patent applies segmentation by dividing the enzyme system into separate functional modules: a light-sensitive recruitment domain, a linkage region, and the catalytic PLD domain. This modular architecture allows independent optimization of each component and enables precise spatial control of enzyme activity at specific membrane compartments while maintaining high catalytic efficiency
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 engineered PLD enzymes achieve up to 100-fold higher transphosphatidylation activity compared to wild-type PLD, enabling precise manipulation of phospholipid species in membranes and facilitating the synthesis of desired phospholipids with high selectivity and yield.
Implementation Method 1
catalyze transphosphatidylation with exogenous alcohols to swap out head groups to form a variety of natural and unnatural phospholipids
Implementation Method 2
catalyzes hydrolysis of PC to form a signaling lipid, phosphatidic acid (PA)
Data Source
AI summary
Engineered phospholipase D mutants are described herein. Also described herein are methods of making engineered phospholipase D mutants. Additionally, methods of using engineered phospholipase D mutants are described.