Cloning, sequence, and expression of bovine interferon-gamma

Area of Science:

• Immunology
• Molecular Biology
• Biochemistry

Background:

• Interferon-gamma (IFN-gamma) plays a crucial role in the immune response.
• Understanding species-specific IFN-gamma sequences is vital for comparative immunology and therapeutic development.

Purpose of the Study:

• To isolate and characterize the bovine interferon-gamma (IFN-gamma) gene sequence.
• To determine the amino acid sequence and homology with other species' IFN-gamma.
• To synthesize biologically active bovine IFN-gamma.

Main Methods:

• Screening a bovine lymph node cDNA library using a human IFN-gamma cDNA probe.
• Sequence analysis to predict amino acid composition and molecular weight.
• Expression of bovine IFN-gamma in Escherichia coli.

Main Results:

• Isolation of bovine IFN-gamma cDNA sequences.
• Prediction of a 166-amino acid precursor and a 143-amino acid mature protein.
• High amino acid homology: 63% with human IFN-gamma and 47% with murine IFN-gamma.
• Successful synthesis of biologically active bovine IFN-gamma in E. coli.

Conclusions:

• The study successfully characterized the bovine IFN-gamma sequence.
• The findings provide insights into the evolutionary conservation of IFN-gamma.
• The production of active bovine IFN-gamma in E. coli opens avenues for further research and application.