Alkali-Stable AAV8 Affinity Ligands for Resin Reuse
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current affinity resins for purifying adeno-associated virus (AAV) serotype 8 are not alkali stable and can only be reused a few times, leading to high resin consumption and costs due to limitations in cleaning with sodium hydroxide, necessitating the development of affinity ligands and agents that can specifically bind AAV8 and its variants with enhanced stability.
Innovation Solution
Affinity ligands with specific amino acid sequences, such as those represented by SEQ ID NOs 14-93, are used to create affinity agents that can be coupled to solid supports, allowing for efficient purification of AAV8 and its variants, with the ability to withstand alkali cleaning and repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current affinity resins are used for AAV8 purification, then AAV8 can be purified with high specificity, but the resins cannot be cleaned with sodium hydroxide and can only be reused for a few cycles, leading to high resin consumption and costs
Solution Approach 1:
The patent modifies the chemical parameters of the affinity ligand by introducing alkali-stable chemical bonds and structures. The new ligand composition includes specific amino acid sequences and chemical moieties that resist degradation by sodium hydroxide, enabling the resin to withstand harsh cleaning conditions and be reused for many more cycles while maintaining binding specificity.
Solution Approach 2:
The patent creates a composite affinity ligand structure combining multiple functional elements: specific amino acid sequences for AAV8 binding, alkali-stable chemical bonds for durability, and appropriate spacing elements. This composite structure integrates both high specificity and long-term stability, allowing the resin to maintain performance over numerous reuse cycles.
2Productivity
If affinity resins are designed for high specificity binding, then purification efficiency is improved, but resin stability under cleaning conditions deteriorates, limiting cleaning options and reuse potential
Solution Approach 1:
The affinity ligand is segmented into distinct functional regions: a binding domain for AAV8 specificity, a stable backbone structure for chemical durability, and flexible linkers for optimal orientation. This segmentation allows each region to be optimized independently - the binding domain maintains high affinity while the backbone provides alkali stability.
Solution Approach 2:
The patent incorporates preemptive protective measures in the ligand design by including alkali-resistant chemical bonds and structures that are pre-configured to withstand harsh cleaning conditions. This prior cushioning prevents degradation before it occurs, ensuring the resin maintains its binding properties even after repeated exposure to sodium hydroxide cleaning.
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 affinity ligands and agents provide high specificity and stability, enabling efficient and cost-effective purification of AAV8, maintaining binding capacity and reducing resin consumption through alkali-tolerant cleaning, thereby addressing the limitations of existing resins.
Implementation Method 1
an affinity ligand that specifically binds with AAV8 capsid or a variant of an AAV8 capsid
Data Source
AI summary
Provided herein are affinity ligands that specifically interact with AAV8 capsid and/or AAV8 variant capsid, affinity agents comprising the affinity ligands, and methods of their use for binding, isolation, and/or purification of AAV8 and variants thereof.