Abstract
A single-tube RT-PCR technique generated a 387 bp or 300 bp cDNA amplicon covering the F0 cleavage site or the carboxyl (C)-terminus of the HN gene, respectively, of Newcastle disease virus (NDV) strain I-2. Sequence analysis was used to deduce the amino acid sequences of the cleavage site of F protein and the C-terminus of HN protein, which were then compared with sequences for other NDV strains. The cleavage site of NDV strain I-2 had a sequence motif of 112 RKQGRLIG119, consistent with an avirulent phenotype. Nucleotide sequencing and deduction of amino acids at the C-terminus of HN revealed that strain I-2 had a 7-amino-acid extension (VEILKDGVREARSSR. This differs from the virulent viruses that caused outbreaks of Newcastle disease in Australia in the 1930s and 1990s, which have HN extensions of 0 and 9 amino acids, respectively. Amino acid sequence analyses of the F and HN genes of strain I-2 confirmed its avirulent nature and its Australian origin.
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Abbreviations
- bp:
-
base pairs
- cDNA:
-
complementary deoxyribose nucleic acid
- F0 protein:
-
fusion uncleaved protein
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Wambura, P.N., Meers, J., Kattenbelt, J.A. et al. Deduced Amino Acid Sequences Surrounding the Fusion Glycoprotein Cleavage Site and of the Carboxyl-terminus of Haemagglutinin–Neuraminidase Protein of the Avirulent Thermostable Vaccine Strain I-2 of Newcastle disease virus . Vet Res Commun 31, 105–112 (2007). https://doi.org/10.1007/s11259-006-3290-8
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DOI: https://doi.org/10.1007/s11259-006-3290-8