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Secretion of thermostable DNA polymerase using a novel baculovirus vector
B S Mroczkowski1, A Huvar, W Lernhardt
1Agouron Institute, La Jolla, California 92037.
The Journal of Biological Chemistry
|May 6, 1994
Summary
This study enhances baculovirus expression systems by engineering vectors for recombinant protein secretion from insect cells. The human placental alkaline phosphatase signal sequence proved optimal for maximizing secretion of various proteins.
Area of Science:
- Biotechnology
- Molecular Biology
- Protein Expression
Background:
- Baculovirus-mediated expression is vital for high-yield recombinant protein production.
- Enhancing secretion of functional proteins from insect cells remains a key challenge.
Purpose of the Study:
- To develop versatile transfer vectors for improved recombinant protein secretion.
- To identify optimal signal sequences for maximizing heterologous protein secretion.
Main Methods:
- Constructed transfer vectors with secretory leader sequences downstream of the polyhedrin promoter.
- Performed in-frame insertion of cDNA sequences for fusion protein synthesis.
- Tested human and insect leader sequences with various proteins, including Pfu DNA polymerase.
Main Results:
- Successfully facilitated secretion of recombinant proteins from host insect cells.
- Demonstrated that the human placental alkaline phosphatase signal sequence is optimal for secretion.
- Achieved efficient secretion of a thermostable bacterial enzyme and other biologically active polypeptides.
Conclusions:
- Engineered baculovirus vectors significantly enhance recombinant protein secretion.
- The human placental alkaline phosphatase signal sequence is a highly effective tool for this purpose.
- This approach broadens the utility of baculovirus expression systems for producing secreted proteins.