Zwitterionic Detergent Viral Inactivation in Recombinant Protein
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Solution Overview
Problem
Current methods for producing therapeutic recombinant proteins using rodent or mammalian cells face challenges with viral contamination, particularly from enveloped viruses, and existing solvent/detergent systems are costly, ecotoxic, and affect protein production processes.
Innovation Solution
The use of eco-friendly, non-protein denaturing zwitterionic detergents at concentrations above their critical micelle concentration effectively inactivates enveloped viruses without impairing the biological activity of recombinant proteins, eliminating the need for organic solvents like tri-n-butyl phosphate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If classical solvent/detergent (SD) viral inactivation systems are used, then enveloped viruses are inactivated, but the protein production process is adversely affected and economic/environmental concerns arise
Solution Approach 1:
The patent replaces expensive, ecotoxic organic solvents with inexpensive, biodegradable zwitterionic detergents that can be easily disposed of without environmental harm. The zwitterionic detergent achieves viral inactivation at concentrations above its CMC, making it a cost-effective and environmentally friendly alternative to classical SD systems.
Solution Approach 2:
The patent changes the chemical parameters of the inactivation system by using zwitterionic detergents with specific properties (amphoteric nature, CMC-based dosing) instead of traditional organic solvents. This parameter change maintains viral inactivation effectiveness while eliminating ecotoxicity and adverse effects on protein production.
2Reliability
If organic solvents like tri-n-butyl phosphate are used, then viral inactivation is achieved, but protein biological activity is impaired and production costs increase
Solution Approach 1:
The patent replaces protein-denaturing organic solvents with mild zwitterionic detergents that do not impair protein biological activity. The zwitterionic detergent can be used at concentrations above CMC to inactivate viruses while preserving protein function, eliminating the need for complex post-treatment steps to restore protein activity.
3Reliability
If zwitterionic detergent is used at concentrations above CMC, then enveloped viruses are inactivated without affecting protein activity, but detergent cost increases
Solution Approach 1:
The patent optimizes the dosing parameter by using concentrations above the CMC of zwitterionic detergent, which is a well-defined physical parameter. This approach ensures sufficient micelle formation for viral inactivation while avoiding excessive detergent usage. The CMC-based dosing strategy provides a scientific basis for minimizing detergent consumption while maintaining effectiveness.
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 achieves high viral inactivation (up to 10 log reduction) while maintaining protein activity, reducing economic and environmental concerns associated with traditional methods, and is applicable across various cell lines and protein production processes.
Implementation Method 1
zwitterionic detergent used at or above its critical micelle concentration (CMC), generally in the absence of solvent, effectively inactivates enveloped virus(es)
Implementation Method 2
The lipid-containing virus envelope, which is required for attachment of the virus to a host cell, is disrupted by reaction with detergent
Data Source
AI summary
Aspects of the invention provide therapeutic recombinant protein preparations and methods of preparing therapeutic recombinant protein, which methods include contacting recombinant protein preparations with zwitterionic detergent at or above critical micelle concentration of the detergent.