Bovine respiratory syncytial virus nucleocapsid protein: mRNA sequence analysis and expression from recombinant vaccinia virus vectors Free

Abstract

The nucleotide sequence of the mRNA encoding the nucleocapsid (N) protein of bovine respiratory syncytial (BRS) virus, strain 391-2, was determined. Recombinant vectors containing a cDNA of the complete N gene were constructed, and expression of the N protein in eukaryotic cells was demonstrated using two different vector systems. The BRS virus N mRNA was 1197 nucleotides in length, exclusive of poly(A), and had a single major open reading frame that encoded a polypeptide of 391 amino acids with a calculated of 42.6K. The nucleotide and amino acid sequences of the BRS virus N gene were compared to those of human respiratory syncytial (HRS) virus strains A2 and 18537, and to BRS virus strain A51908. The level of nucleic acid identity between the N mRNA of BRS virus 391-2 and both HRS virus subtypes was 80 to 81%, whereas the identity between the two BRS virus strains was 97%. A 93 to 94% level of identity was observed between the deduced amino acid sequences of the N protein of BRS virus 391-2 and the corresponding sequences of the two HRS virus strains. The two BRS virus N proteins differed in amino acid sequence at only three positions. Recombinant BRS virus N protein was expressed using two different vector systems: in cells from a plasmid using the vaccinia virus/T7 polymerase expression system or from a recombinant vaccinia virus. N proteins synthesized by the two vector systems migrated with an electrophoretic mobility identical to that of authentic BRS virus N protein, and were precipitated by anti-BRS virus antibodies.

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1992-04-01
2024-03-29
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