Recombinant DNA Elements for Baculovirus Protein Expression
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Solution Overview
Problem
The baculovirus expression vector system (BEVS) faces challenges in accelerating recombinant protein expression in insect larvae before cellular machinery is severely impaired by infection and in maintaining cell integrity at late times post-infection, leading to reduced productivity and incorrect post-translational modifications of proteins.
Innovation Solution
Incorporation of recombinant DNA elements, including baculovirus transcriptional regulators and enhancer homologous regions, into expression cassettes to increase protein production levels and extend the survival of infected larvae, thereby enhancing the integrity of cell functions and correct post-translational processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional baculovirus promoters (polh or p10) are used for late expression, then strong promoter activity is achieved, but cell integrity is severely impaired and productivity is reduced
Solution Approach 1:
The patent applies preliminary action by expressing transcriptional regulators (IE-1, IE-0) and homologous region enhancers before the conventional late expression phase. These elements are introduced via recombinant baculovirus that expresses them under early promoters, preparing the cellular machinery in advance to maintain integrity during subsequent protein production phases.
Solution Approach 2:
The patent uses transcriptional regulators (IE-1, IE-0 proteins) and homologous region enhancers as intermediary elements between the promoter and the target gene. These intermediaries modulate the expression pattern, allowing early activation of protective factors while maintaining promoter strength for later protein production.
2Productivity
If recombinant protein expression is accelerated before cellular machinery is impaired, then productivity increases, but correct post-translational processing is compromised
Solution Approach 1:
The patent applies preliminary action by introducing and expressing transcriptional regulators and homologous region enhancers before the main protein expression phase. This preliminary setup ensures that cellular machinery remains functional and intact during the acceleration phase, enabling both high productivity and correct post-translational processing.
Solution Approach 2:
The patent changes the temporal and regulatory parameters of gene expression by using recombinant DNA elements that alter the expression kinetics. The transcriptional regulators modify the timing and level of protein synthesis, allowing accelerated production while maintaining cellular functions necessary for proper protein folding and modification.
3Productivity
If high infectious dose of baculovirus is used to increase protein production, then productivity increases, but larval survival rate decreases
Solution Approach 1:
The patent uses transcriptional regulators (IE-1, IE-0) and homologous region enhancers as intermediary protective factors. These elements, expressed under the control of the recombinant baculovirus, act as mediators that mitigate the harmful effects of high viral doses while maintaining the beneficial high protein production levels.
Solution Approach 2:
The patent converts the potentially harmful high viral dose into a beneficial situation by introducing recombinant DNA elements that harness the viral replication machinery for producing protective transcriptional regulators. These regulators then protect the larva from viral-induced damage while still allowing high-level protein expression.
Data Source
AI summary
Reagents and methods are provided that allow for an improved expression of a recombinant protein in an insect, More specifically, the introduction of recombinant DNA elements into an insect larva allows for the increased expression of a recombinant protein, an improvement of the correct folding of said protein and an increase in the survival rate after infection of the insect These recombinant DNA elements can be introduced, for example, into insect larvae via a recombinant baculovirus, which has incorporated said elements. The recombinant DNA elements include nucleic acids encoding transcriptional regulators, such as IE-0 and IE-1, transcriptional, enhancer elements, such as the homologous region (hr) and promoters.