Cloning and nucleotide sequence of the major capsid protein from Lactococcus lactis ssp. cremoris bacteriophage F4-1

Area of Science:

• Microbiology
• Molecular Biology
• Virology

Background:

• Bacteriophages are viruses that infect bacteria, playing crucial roles in microbial ecosystems.
• Understanding bacteriophage genetics is essential for applications in food safety and biotechnology.
• The Lactococcus lactis ssp. cremoris bacteriophage F4-1 is a significant phage in dairy fermentations.

Purpose of the Study:

• To clone and determine the nucleotide sequence of the major capsid protein (MCP) gene from Lactococcus lactis bacteriophage F4-1.
• To identify and characterize the genetic basis of the MCP in this specific bacteriophage.

Main Methods:

• Gene cloning and nucleotide sequencing of the mcp gene.
• Western blotting using rabbit antiserum against the bacteriophage to localize the mcp gene.
• Deletion analysis and N-terminal sequencing of the MCP for gene identification confirmation.

Main Results:

• The gene (mcp) encoding the 35-kDa major capsid protein (MCP) was successfully cloned and sequenced.
• The mcp gene comprises a 905-bp open reading frame, preceded by a putative ribosome-binding site.
• Localization studies confirmed the mcp gene resides within a 3.3-kb HindIII-Spe I fragment.

Conclusions:

• The nucleotide sequence of the Lactococcus lactis bacteriophage F4-1 mcp gene has been determined.
• The study successfully identified and confirmed the gene responsible for the major capsid protein.
• This provides foundational genetic information for understanding bacteriophage F4-1 structure and replication.