Recombinant DNA Elements for Baculovirus Protein Expression

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Solution Overview

Problem

The baculovirus expression vector system (BEVS) faces challenges in achieving early and sustained recombinant protein expression while maintaining cell integrity and productivity, as conventional promoters like polyhedrin (polh) or p10 lead to late expression and virus-induced cell damage, limiting the time frame for protein production and post-translational modifications.

Innovation Solution

Incorporation of recombinant DNA elements, including the Ac-ie-01 gene and homologous region (hr) sequences, which drive the expression of transcriptional regulators IE-1 and IE-0 above endogenous levels, linked to promoters such as pB2, to enhance protein production and cell viability, forming part of expression cassettes in baculoviruses, vectors, and cells.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional strong virus promoters like polyhedrin (polh) or p10 are used to drive late expression, then productivity is improved, but cell integrity deteriorates due to virus-induced cell damage

Engineering Contradiction:

Improverecombinant protein productionVSAvoidcell integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent introduces immediate early (ie) genes that are expressed before the conventional late promoters activate, preparing the transcriptional machinery and protecting cellular functions in advance. This preliminary action allows protein expression to begin earlier in the infection cycle, extending the productive window before cell damage occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent employs a dynamic promoter system that transitions from immediate early to late expression, allowing the system to adapt its gene expression profile over time. This dynamic regulation enables sustained protein production across different infection stages while modulating viral replication to preserve cell integrity longer.

Inventive Principle:

Principle #15Dynamics

2Quantity of substance

If late expression is driven by conventional promoters, then protein accumulation is increased, but the time frame for post-translational modifications is reduced

Engineering Contradiction:

Improveprotein accumulationVSAvoidtime frame for post-translational modifications

Core Design Contradiction:

Quantity of substanceVSDuration of action of moving object

Solution Approach 1:

The immediate early genes initiate protein expression earlier in the infection cycle, providing an extended time window for post-translational modifications before cells undergo lysis. This preliminary expression phase allows proper folding and modification of complex proteins without compromising final yield.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If virus-induced cell death is reduced, then cell viability is improved, but this requires modification of viral replication machinery

Engineering Contradiction:

Improvecell viabilityVSAvoidviral genome modification

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts and introduces specific immediate early genes from the viral genome into a modified expression system, separating the functions needed for protein expression from those required for complete viral replication. This extraction allows reduced virulence and improved cell viability while maintaining protein production capability.

Inventive Principle:

Principle #2Taking out (Extraction)

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 approach results in unprecedented levels of recombinant protein production from early to late times post-infection, increased cell proliferation, and prolonged cell viability, improving the integrity and functionality of infected cells for correct protein folding and processing.

Implementation Method 1

Methodology Applied

Scientific EffectTranscriptional regulation:

Implementation Method 2

This approach results in unprecedented levels of recombinant protein production from early to late times post-infection, increased cell proliferation, and prolonged cell viability

Methodology Applied

Scientific EffectCell proliferation:

Data Source

PatentEP2858489B1Recombinant DNA elements for the expression of recombinant proteins in a host cell

Publication Date: 2016.11.09 ALTERNATIVE GENE EXPRESSION

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AI summary

Reagents and methods are provided that allow for an improved expression of a recombinant protein. More specifically, the introduction of recombinant DNA elements into a host cell allows for the increased expression of a recombinant protein, an improvement of the correct folding of said protein and an increase in cell viability and proliferation of the host cell, These recombinant DNA elements can be introduced into host cells, for example, 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.