Novel variation in the N protein of avian infectious bronchitis virus

Virology
S SapatsJ Ignjatovic

Abstract

The nucleocapsid protein of coronaviruses has been considered highly conserved, showing greater than 94% conservation within strains of a given species. We determined the nucleotide sequence of the N gene and the 3' untranslated region (UTR) of eight naturally occurring strains of IBV which differed in pathogenicity and tissue tropism. In pairwise comparisons, the deduced amino acid sequences of N of five strains Vic S, N1/62, N9/74, N2/75, and V5/90 (group I) shared 92.3-98.8% identity. The three strains N1/88, Q3/88, and V18/91 (group II) shared 85.8-89.2% identity with each other, but only 60.0-63.3% identity with viruses of group I. Amino acid substitutions, deletions, and insertions occurred throughout the N protein and involved regions previously identified as being conserved. Despite the considerable variation observed between the two virus groups, all N proteins contained a high proportion of basic residues, 80% of which were conserved in position. In addition, all strains contained approximately 30 serine residues of which 10 were conserved, the majority occurring between positions 168 and 194. As for all other coronaviruses, the region between positions 92 and 103 was highly conserved. Hence, a large number of amino a...Continue Reading

Citations

Mar 16, 2006·Avian Pathology : Journal of the W.V.P.A·Dave Cavanagh
Nov 30, 2007·Journal of Virology·Karim MardaniGlenn F Browning
Sep 12, 2013·PloS One·Gui-Qian ChenJi-Ming Chen
May 17, 2008·Avian Pathology : Journal of the W.V.P.A·G D Raj, R C Jones
Nov 5, 2010·Archives of Virology·Kylie A HewsonAmir H Noormohammadi
Feb 28, 2015·Avian Pathology : Journal of the W.V.P.A·José A QuinterosGlenn F Browning
May 16, 2019·Veterinary World·Musaed Abdulaziz AlsultanMaged Gomaa Hemida
Jun 16, 2021·Avian Pathology : Journal of the W.V.P.A·José A QuinterosGlenn F Browning

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