Mapping of the genes coding for the two major vaccinia virus core polypeptides

Area of Science:

• Virology
• Molecular Biology
• Genomics

Background:

• The vaccinia virus core contains major structural polypeptides crucial for its function.
• Understanding the genetic organization of these polypeptides is essential for vaccinia virus research.

Purpose of the Study:

• To precisely map the genes encoding two major structural polypeptides of the vaccinia virus core.
• To determine the location and orientation of these genes within the vaccinia virus genome.

Main Methods:

• Hybrid selection of RNA using restriction fragments of the vaccinia virus genome.
• In vitro translation of selected RNA and immunoprecipitation of polypeptide products.
• Transcriptional mapping of the identified genomic region.

Main Results:

• The genes for two major vaccinia virus core structural polypeptides were mapped.
• These genes are located at the left end of a large Hind III restriction fragment.
• Both genes are transcribed from the leftward reading strand, with their 5'-ends separated by approximately 7.5 kilobase pairs.
• The gene cluster is situated around 105 kilobase pairs from the left end of the 180 kilobase pair vaccinia virus genome.

Conclusions:

• Two genes encoding vaccinia virus core structural polypeptides with similar particle locations are genetically clustered.
• This finding contributes to the understanding of vaccinia virus genome organization and gene expression.