Fusion Polypeptide Self-Aggregating Peptide Purification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing and purifying polypeptides like human growth hormone and interferon α2a are costly and inefficient due to the need for complex purification steps and expensive chromatography techniques, especially when dealing with proteins containing disulfide bonds.
Innovation Solution
A fusion polypeptide comprising a target polypeptide moiety and a self-aggregating peptide moiety, linked via a spacer with a cleavage tag, which forms active aggregates in host cells, allowing for simple and low-cost production and purification by releasing the target polypeptide through self-cleavage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional affinity purification methods (his-tag, GST-tag) are used, then purification efficiency is improved (yield >90%), but production cost increases due to expensive purification columns
Solution Approach 1:
The invention extracts and removes the expensive purification column step from the process by using self-aggregating peptides that cause target proteins to automatically precipitate. This eliminates the need for affinity chromatography columns while maintaining high purification efficiency through simple centrifugation or filtration.
Solution Approach 2:
The invention replaces expensive, reusable purification columns with a cheap, consumable self-aggregating peptide system. The peptides are expressed temporarily in host cells, perform their aggregation function, and are then discarded after simple removal of the aggregated precipitate, eliminating the need for costly column maintenance and regeneration.
2Manufacturing precision
If multiple chromatography techniques are used for purification, then purification completeness is improved, but process complexity increases
Solution Approach 1:
The invention extracts and removes multiple complex chromatography steps from the purification process, replacing them with a single precipitation step using self-aggregating peptides. This simplifies the process from multiple sequential operations to one dominant step while maintaining purification effectiveness.
Solution Approach 2:
The invention merges multiple purification functions (separation, concentration, purification) into a single precipitation step. The self-aggregating peptides simultaneously achieve all these functions by causing target proteins to precipitate in a unified process, eliminating the need for separate chromatography steps.
3Productivity
If target polypeptide is expressed directly in E. coli cells, then production speed is improved, but protein solubility deteriorates (forms inactive inclusion bodies)
Solution Approach 1:
The invention merges two previously separate functions into one fusion protein: the target polypeptide and the self-aggregating peptide. This combined structure allows the target protein to be produced rapidly in E. coli while the self-aggregating peptide simultaneously ensures proper folding and prevents inclusion body formation through controlled aggregation.
Solution Approach 2:
The self-aggregating peptide acts as an intermediary that mediates between the rapid production environment of E. coli and the solubility requirements of the target protein. It facilitates proper protein folding and prevents aggregation into inactive inclusion bodies while maintaining production 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
This method enables efficient production and purification of polypeptides with disulfide bonds, such as human growth hormone and interferon α2a, with high yield and purity, reducing production costs and eliminating the need for expensive purification columns.
Implementation Method 1
a self-aggregating peptide moiety, wherein the fusion polypeptide, after expression in a host cell, can form an active aggregate through the self-aggregating peptide moiety
Implementation Method 2
allowing for simple and low-cost production and purification by releasing the target polypeptide through self-cleavage
Data Source
AI summary
The present invention provides a fusion polypeptide comprising a target polypeptide moiety and a self-aggregating peptide moiety, and a method of producing and purifying a target polypeptide by expressing the fusion polypeptide.