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. 1989 Sep;63(9):3586–3594. doi: 10.1128/jvi.63.9.3586-3594.1989

Transcription-inhibition and RNA-binding domains of influenza A virus matrix protein mapped with anti-idiotypic antibodies and synthetic peptides.

Z P Ye 1, N W Baylor 1, R R Wagner 1
PMCID: PMC250948  PMID: 2474671

Abstract

We have undertaken by biochemical and immunological experiments to locate the region of the matrix (M1) protein responsible for down-regulating endogenous transcription of A/WSN/33 influenza virus. A more refined map of the antigenic determinants of the M1 protein was obtained by binding of epitope-specific monoclonal antibodies (MAbs) to chemically cleaved fragments. Epitope 2-specific MAb 289/4 and MAb 7E5 reverse transcription inhibition by M1 protein and react with a 4-kilodalton cyanogen bromide fragment extending from amino acid Gly-129 to Gln-164. Anti-idiotype serum immunoglobulin G prepared in rabbits immunized with MAb 289/4 or MAb 7E5 mimicked the action of M1 protein by inhibiting transcription in vitro of influenza virus ribonucleoprotein cores. This transcription-inhibition activity of anti-MAb 7E5 immunoglobulin G and anti-MAb 289/4 immunoglobulin G could be reversed by MAb 7E5 and MAb 289/4 or could be removed by MAb 7E5-Sepharose affinity chromatography. Transcription of influenza virus ribonucleoprotein was inhibited by one of three synthetic oligopeptides, a nonodecapeptide SP3 with an amino acid sequence corresponding to Pro-90 through Thr-108 of the M1 protein. Of all the structural proteins of influenza virus, only NP and M1 showed strong affinity for binding viral RNA or other extraneous RNAs. The 4-kilodalton cyanogen bromide peptide (Gly-129 to Gln-164), exhibited marked affinity for viral RNA, the binding of which was blocked by epitope 2-specific MAb 7E5 but not by MAbs directed to three other epitopes. Viral RNA also bound strongly to the nonodecapeptide SP3 and rather less well to anti-idiotype anti-MAb 7E5; these latter viral RNA-binding reactions were only slightly blocked by preincubation of anti-MAb 7E5 or SP3 with MAb 7E5. These experiments suggest the presence of at least two RNA-binding sites, which also serve as transcription-inhibition sites, centered around amino acid sequences 80 through 109 (epitope 4?) and 129 through 164 (epitope 2) of the 252 amino acid M1 protein of A/WSN/33 influenza virus. A hydropathy plot of the M1 protein calculated by free-energy transfer suggests that the two hydrophilic transcription-inhibition RNA-binding domains are brought into close proximity by an alpha-helix-forming intervening hydrophobic domain.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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