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Construction of an Rb gene expression plasmid
1Department of Ophthalmology, West China University of Medical Sciences, Chengdu.
Summary
Researchers successfully expressed the Retinoblastoma (Rb) protein in E. coli. This engineered fusion protein, produced using a Lac Z promoter, comprised over 5% of total bacterial protein and reacted specifically with anti-Rb antibodies.
Area of Science:
- Molecular Biology
- Protein Expression
- Recombinant DNA Technology
Background:
- The Retinoblastoma (Rb) protein plays a crucial role in cell cycle regulation.
- Efficient methods for producing large quantities of functional Rb protein are essential for research and therapeutic development.
Purpose of the Study:
- To construct a plasmid for expressing the Retinoblastoma (Rb) gene in E. coli.
- To achieve high-level expression of a functional Rb fusion protein in a bacterial system.
Main Methods:
- Obtained an 844 bp BglII fragment from an Rb cDNA clone.
- Inserted the fragment into the pWR-13 expression vector under the control of a Lac Z promoter.
- Transformed E. coli with the recombinant plasmid, screened using in situ hybridization, and analyzed protein expression via SDS-PAGE and Western blot.
Main Results:
- Successfully constructed an Rb gene expression plasmid.
- Produced a fusion protein consisting of Rb protein and a Lac Z peptide, detectable as a unique 28,000 band in sense clones.
- The expressed protein constituted over 5% of total bacterial protein and specifically reacted with an anti-Rb peptide antibody.
Conclusions:
- Demonstrated successful expression of the Retinoblastoma (Rb) protein in E. coli.
- The developed method yields a significant amount of Rb fusion protein, suitable for further biochemical and functional studies.