Size of the poly(A) sequences in encephalomyocarditis virus RNA

Area of Science:

• Virology
• Molecular Biology
• RNA Biochemistry

Background:

• Polyadenylation is a crucial post-transcriptional modification in eukaryotic mRNA.
• The presence and characteristics of poly(A) sequences in viral RNA are important for understanding viral gene expression and replication.

Purpose of the Study:

• To identify and characterize poly(A) sequences in encephalomyocarditis virus (EMC) RNA.
• To determine the size and location of these poly(A) sequences.

Main Methods:

• Affinity chromatography using poly(U)-Sepharose.
• RNase digestion (pancreatic RNase, RNase T1, snake venom phosphodiesterase).
• Primer extension assays for reverse transcription.
• Polyacrylamide gel electrophoresis (PAGE).
• Alkaline hydrolysis followed by AMP-to-adenosine ratio determination.

Main Results:

• Poly(A) sequences were successfully demonstrated in EMC virus RNA.
• The size of the poly(A) sequences was estimated to be 10-20 nucleotides.
• Poly(A) sequences were localized to the 3' end of the viral RNA.

Conclusions:

• EMC virus RNA possesses poly(A) sequences.
• These sequences are relatively short and located at the 3' terminus.
• Further investigation into the function of these poly(A) sequences in EMC virus is warranted.