Immunoglobulin Single Variable Domain Yield via Auxiliary Protein Co-expression
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Solution Overview
Problem
The production of immunoglobulin single variable domains, such as VHHs and Nanobodies, faces challenges with low yields when expressed in certain hosts like Pichia pastoris, particularly for multivalent forms or those with multiple disulfide bridges, leading to suboptimal therapeutic applications.
Innovation Solution
Enhancing the expression of auxiliary proteins like HAC1spliced, PDI1, Kar2p, and RPP0 in Pichia hosts significantly increases the yield of immunoglobulin single variable domains by optimizing the protein folding and secretion pathways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If immunoglobulin single variable domains are expressed in Pichia pastoris, then protein production system is established, but yield is low
Solution Approach 1:
The patent introduces auxiliary proteins (BiP, PDI1, Kar2p, RPP0) as intermediary molecules that mediate between the immunoglobulin single variable domain and the cellular machinery. These auxiliary proteins facilitate proper folding, disulfide bond formation, and secretion, thereby increasing yield without compromising production reliability.
Solution Approach 2:
The patent modifies expression parameters by co-overexpressing auxiliary proteins alongside the immunoglobulin single variable domain. This parameter change in the expression system transforms the low-yield situation into a high-yield production, achieving both improved productivity and maintained reliability.
2Productivity
If conventional expression systems are used, then production process is simple, but yield is insufficient
Solution Approach 1:
The patent merges multiple functions into a single expression system by co-overexpressing auxiliary proteins (BiP, PDI1, Kar2p, RPP0) together with the immunoglobulin single variable domain. This combining of folding assistance, disulfide bond formation, and secretion functions achieves high yield while managing system complexity through integrated protein expression.
3Productivity
If auxiliary proteins are co-overexpressed, then yield increases, but production complexity increases
Solution Approach 1:
The auxiliary proteins serve multiple functions simultaneously: BiP assists in protein folding, PDI1 forms disulfide bonds, Kar2p and RPP0 facilitate secretion. This multi-functionality allows the system to achieve high yield through a coordinated set of proteins that perform multiple roles, managing complexity through functional integration rather than separate processes.
Data Source
AI summary
Methods are provided for the manufacture of polypeptides comprising at least one immunoglobulin variable domain that result in an increased yield. The methods are based on simultaneous enhancement of one or more auxiliary proteins in the host.