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Improved mammalian expression systems by manipulating transcriptional termination regions
Dongjun Kim1, Jeong Do Kim, Kwanghee Baek
1Graduate School of Biotechnology, Kyung Hee University, Yongin City, Kyungki-Do 449-701, Korea.
Biotechnology Progress
|October 4, 2003
Summary
The human gastrin gene transcriptional terminator enhances recombinant protein expression by stabilizing mRNA. This finding improves transient expression levels in various cell types, aiding protein production.
Area of Science:
- Molecular Biology
- Gene Expression Regulation
Background:
- Transcriptional termination is crucial for gene expression control.
- The human gastrin gene terminator is the only characterized functional element for transcriptional termination.
- Understanding termination elements can optimize recombinant protein production.
Purpose of the Study:
- To investigate the functional role of the human gastrin gene transcriptional terminator element.
- To determine its impact on recombinant protein expression levels.
- To elucidate the mechanism behind any observed expression enhancement.
Main Methods:
- Insertion of the human gastrin gene terminator element into a pSV-beta-gal vector.
- Assessing beta-galactosidase gene expression in HeLa, COS.M6, and CHO DG44 cells.
- Analyzing cellular mRNA levels to understand expression regulation.
Main Results:
- The human gastrin gene terminator element enhanced beta-galactosidase expression 3-4 fold in HeLa cells.
- This enhancement was observed in multiple cell lines (COS.M6, CHO DG44) and was orientation-dependent.
- Increased expression correlated with elevated cellular mRNA levels, indicating mRNA stabilization.
Conclusions:
- The human gastrin gene terminator element significantly boosts transient protein expression.
- It functions by stabilizing mRNA through enhanced 3'-end processing.
- This element offers a valuable tool for optimizing recombinant protein production.