Activated FGE Enzyme Copper Ion Optimization for FGly Conjugation
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Solution Overview
Problem
Current methods for site-specific modification of therapeutic proteins in mammalian cells lack efficiency in introducing formylglycine residues for targeted conjugation of agents, limiting the enhancement of protein properties and functionality.
Innovation Solution
The use of activated formylglycine-generating enzymes (FGE) that convert cysteine or serine residues to formylglycine residues within proteins, enabling site-specific conjugation of therapeutic or imaging agents by combining these enzymes with proteins containing FGE recognition sites in cell-based or cell-free systems, utilizing Cu2+ as an oxidation reagent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current methods for site-specific modification of therapeutic proteins are used, then protein properties can be enhanced, but the efficiency of introducing formylglycine residues for targeted conjugation is limited
Solution Approach 1:
The patent applies parameter changes by optimizing the activation conditions of FGE through copper ion concentration control and pH adjustment. The enzyme is activated at specific copper concentrations (0.1-10 μM) and pH ranges (6.5-7.5), which significantly enhances the efficiency of formylglycine residue introduction while maintaining protein functionality and enabling reliable targeted conjugation
2Productivity
If activated FGE is used to convert cysteine or serine residues to formylglycine residues, then site-specific conjugation efficiency is improved, but the complexity of the production process increases
Solution Approach 1:
The patent applies preliminary action by pre-activating the FGE enzyme with copper ions before it acts on the target protein. The enzyme is incubated with copper ions under controlled conditions to generate the active form, which then efficiently converts cysteine or serine residues to formylglycine residues. This preliminary activation step simplifies the overall process by ensuring the enzyme is in its optimal state before substrate interaction
Solution Approach 2:
The patent uses copper ions as an intermediary to activate FGE. The copper ions serve as a mediator that bridges the inactive enzyme and its active state, enabling the enzyme to perform its function of converting amino acid residues. This intermediary approach allows controlled activation without requiring complex enzymatic systems or multiple reagents
3Productivity
If Cu2+ is used as an oxidation reagent to activate FGE, then formylglycine residue production is enhanced, but the risk of unwanted side reactions increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the copper ion concentration within a narrow range (0.1-10 μM) and maintaining specific pH conditions (6.5-7.5). These parameter optimizations ensure that copper ions effectively activate FGE for formylglycine production while minimizing the concentration-dependent side reactions that could occur with higher copper levels or improper pH conditions
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
This approach enhances the production of proteins with formylglycine residues, allowing for efficient and specific conjugation of agents, thereby improving protein properties and functionality, such as increased therapeutic efficacy or imaging capabilities.
Implementation Method 1
utilizing Cu2+ as an oxidation reagent
Data Source
AI summary
The present disclosure provides activated formylglycine-generating enzymes (FGE), methods of producing activated FGE, and their use in methods of producing a protein comprising a formylglycine (FGly) residue. The methods of producing activated FGE, as well as methods of use of activated FGE in producing FGly-containing proteins, include both cell-based and cell-free methods. Compositions and kits that find use, e.g., in practicing the methods of the present disclosure are also provided.