Purifying Enveloped Viruses Using Polyol-Stabilized Buffers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for purifying lentiviral vectors pseudotyped with glycoproteins like GaLV or MV are limited by the instability and fragility of membrane glycoproteins, leading to low yields and inefficiencies in purification processes.
Innovation Solution
Incorporating a polyol, such as sucrose, into the buffers used during ultrafiltration/diafiltration and anion exchange chromatography steps significantly enhances the purification yield by stabilizing the vectors and improving their recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional purification methods are used for enveloped viruses pseudotyped with GaLV or MV glycoproteins, then the purification process can be completed, but the yield is low due to instability and fragility of the membrane glycoproteins
Solution Approach 1:
The patent applies parameter changes by modifying the pH of buffers used during purification steps. Specifically, using buffers at pH 5.5-6.5 during ultrafiltration/diafiltration and anion exchange chromatography improves glycoprotein stability and increases purification yield compared to conventional neutral pH buffers
Solution Approach 2:
The patent introduces polyols (such as sucrose, sorbitol, or mannitol) as intermediary substances in the purification buffers. These polyols act as protective agents that stabilize the membrane glycoproteins during purification, preventing their degradation and improving recovery yield
2Adaptability or versatility
If VSV-G pseudotyped vectors are purified using conventional methods, then satisfactory purification protocols are available, but vectors pseudotyped with other envelope proteins like GaLV or MV cannot be effectively purified
Solution Approach 1:
The patent develops a universal purification protocol that works for multiple types of enveloped viruses pseudotyped with different glycoproteins (VSV-G, GaLV, MV, etc.). By using pH-adjusted buffers containing polyols, the same basic protocol can be applied across different vector types, making the method universally applicable rather than specific to single virus types
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 addition of polyols like sucrose in the buffers increases the purification yield of lentiviral vectors, particularly those pseudotyped with GaLV glycoproteins, leading to more stable and effective production processes.
Implementation Method 1
the addition of a polyol to one or more of the buffers used during one or more steps of a process for purifying an enveloped virus made it possible to obtain a substantial increase in the purification yield
Implementation Method 2
anion exchange chromatography
Implementation Method 3
ultrafiltration/diafiltration step
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The invention relates to a method for purifying enveloped viruses. The method of the invention is of use for the large-scale recovery of enveloped viruses under conditions which adhere to good manufacturing practice and which make it possible to obtain clinical-grade viruses.