The primary structure and expression of the second open reading frame of the polymerase gene of the coronavirus MHV-A59; a highly conserved polymerase is expressed by an efficient ribosomal frameshifting mechanism.

Sequence analysis of a substantial part of the polymerase gene of the murine coronavirus MHV-A59 revealed the 3' end of an open reading frame (ORF1a) overlapping with a large ORF (ORF1b; 2733 amino acids) which covers the 3' half of the polymerase gene. The expression of ORF1b occurs by a ribosomal frameshifting mechanism since the ORF1a/ORF1b overlapping nucleotide sequence is capable of inducing ribosomal frameshifting in vitro as well as in vivo. A stem-loop structure and a pseudoknot are predicted in the nucleotide sequence involved in ribosomal frameshifting. Comparison of the predicted amino acid sequence of MHV ORF1b with the amino acid sequence deduced from the corresponding gene of the avian coronavirus IBV demonstrated that in contrast to the other viral genes this ORF is extremely conserved. Detailed analysis of the predicted amino acid sequence revealed sequence elements which are conserved in many DNA and RNA polymerases. Images

• Publication year

  1990

• Venue

  Nucleic Acids Research

• Publication date

  1990-04-11

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1093/NAR/18.7.1825PMID 2159623PMCID 330602
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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