Host Cells Overexpressing Alpha 1,2 Mannosidase for Recombinant Protein Production
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Solution Overview
Problem
Current methods for increasing recombinant protein production in cell culture, such as using sodium butyrate, are limited by toxicity and the need for alternative means to enhance glycoprotein production effectively.
Innovation Solution
Engineering host cells to overexpress alpha 1,2 mannosidase (MAN1C1) and a glycoprotein of interest, either through transfection with a vector encoding MAN1C1 or by upregulating its expression, to increase specific productivity and protein production, potentially combined with the use of chemical inducers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sodium butyrate is used to increase recombinant protein production, then productivity increases, but toxic side effects occur
Solution Approach 1:
The patent extracts and identifies the specific mechanism by which sodium butyrate increases protein production (through MAN1C1 enzyme activation) and separates this beneficial effect from the harmful toxic side effects. By focusing on the specific enzymatic pathway rather than the general chemical treatment, the invention enables targeted intervention that achieves productivity improvement without the broad toxicity of sodium butyrate.
Solution Approach 2:
The patent introduces MAN1C1 enzyme as an intermediary mechanism between the chemical treatment and protein production. By identifying and potentially targeting this specific enzyme (rather than using direct chemical induction), the invention creates a more selective pathway that can achieve the desired protein production increase without the harmful effects of direct sodium butyrate exposure.
2Productivity
If sodium butyrate treatment is applied to increase specific productivity, then mRNA levels increase, but cell health deteriorates
Solution Approach 1:
The patent applies local quality by targeting the specific MAN1C1 enzymatic pathway rather than applying a global chemical treatment. By focusing the intervention on the specific gene and enzyme responsible for the desired effect (MAN1C1-mediated protein production enhancement), the invention achieves localized improvement in specific productivity while minimizing broad impacts on cell health and viability.
3Productivity
If host cells are engineered to overexpress MAN1C1, then glycoprotein production increases, but process complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-engineering host cells to overexpress MAN1C1 enzyme before the actual protein production process. This upfront modification of the host cell's genetic machinery creates a permanently enhanced production system, eliminating the need for continuous chemical induction during the production phase and thereby reducing overall process complexity despite the initial engineering step.
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 significant improvements in glycoprotein production, with specific productivity increasing by 2- to 20-fold or higher, and allows for the production of proteins like erythropoietin and its derivatives with enhanced efficiency.
Implementation Method 1
Alpha 1,2 mannosidase I enzyme (MAN1C1) is an enzyme involved in glycoprotein N-linked oligosaccharide processing that has been described in Tremblay et al. (Glycobiology 8: 585-595, 1998) and Gonzalez et al. (J. Biol. Chem. 274: 21375-21386, 1999). The enzyme catalyzes the first mannose trimming step associated with processing of high mannose oligosaccharide structures by removing a terminal mannose sugar from the oligosaccharide.
Implementation Method 2
Treatment with sodium butyrate has been one means of increasing protein production in cell culture in commercial biopharmaceutical processes. Sodium butyrate is a short chain fatty acid that inhibits the histone deacetylase (HDAC) enzyme responsible for the maintenance of chromatin structure in the nucleus of cells (Davie, J. Nutrition 133: 2485S-2493S, 2003). The loss of activity results in an alteration in transcriptional regulation of genes through the normal acetylation and deacetylation process of histones (Prasad et al., In Vitro 12: 125-132, 1976).
Data Source
AI summary
Improved host cells and culture methods involving overexpression of MAN1C1 activity to improve protein production are provided.