Journal List > J Bacteriol Virol > v.45(4) > 1034190

Kim, Lee, Kye, Kim, Seul, Kim, Lee, Jung, and Choi: Biological Property of Recombinant Hemagglutinin-Neuraminidase Protein of Avian Paramyxovirus Type 6 Expressed by Recombinant Baculovirus

Abstract

Hemagglutination inhibition (HI) test employing whole virus antigen is a prescribed serological test for serotyping, diagnosis and surveillance for avian paramyxoviruses (APMVs). For use as alternative to the virus antigen, hemagglutinin-neuraminidase (HN) protein gene of the wild duck isolate APMV-6/WB12-163FS of APMV serotype 6 (APMV-6) was amplified, cloned and expressed in Spodoptera frugiperda insect cells. The HN gene of 1,842 bps in length showed nucleotide and amino acid homology of 93.4% and 97.1%, respectively with that of APMV-6 prototype strain. Putative sialic acid binding motif and potential N-linked glycosylation sites were conserved. In Western blot analysis, the expressed protein had a molecular mass of 66 kDa and reacted specifically with antiserum to APMV-6. In addition, the recombinant HN protein showed biological properties such as hemagglutination (HA) and elution. The recombinant HN protein produced from infected cells showed high HA titers (approximately 213 HA unit/ml). The HA activity of the recombinant HN protein was inhibited by antisera to APMV-6. In cross HA inhibition test, the recombinant HN protein had the highest titers with antisera to homologous APMV serotype, although there was weak cross reaction with some of antisera to other APMV serotypes. Our results indicated that recombinant APMV-6 HN protein would have the potential as alternative to the APMV-6 antigen in HI assays.

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Figure 1.
Agarose gel electrophoresis of recombinant plasmids digested with restriction enzymes of EcoR I and Hind III. M, DNA marker; Lane 1, pCR/APMV6HN; lane 2, pFB/APMV6HN.
jbv-45-319f1.tif
Figure 2.
Predicted amino acid sequence of HN protein gene of APMV-6/WB12-163FS and comparison with APMV-6 prototype strain (APMV-6/duck/Hong Kong/199/77). Black dot (●) represents putative N-linked glycosylation site. Putative sialic acid binding motif was expressed in a box.
jbv-45-319f2.tif
Figure 3.
Western blot analisis of recombinant APMV-6 HN protein using APMV-6 reference antiserum. P. protein markar; lane 1, SPF ECE fluid; lane 2, normal Sf9 cell lysate; lane 3, APMV-6/WB12-163Fs; lane 4, rAPMV-6 HN. Allow represents HN protein of APMV-6.
jbv-45-319f3.tif
Figure 4.
Measurement of NA activity of the rAPMV-6 HN protein expressed in insect cells.
jbv-45-319f4.tif
Table 1.
Heat stability and hemagglutination elution pattern of th rAPMV-6 HN protein
  HA titeer
  Heat treatmenta Incubation at 4°C
  Before After 1 h 24h
APMV-6b 256 128 256 256
rAPMV6 HN 256 4 256 256

a Heat treatment represents treatment of test sample for 30 min a 56℃.

b APMV-6 isolate (APMV-6/WB12-163FS) used as genetic templat for rAPMV-6 HN.

Table 2.
Results of cross HI test using recombinant APMV-6 HN protein and representative APMV serotypes
Antiserum Antigen
rAPMV-6HN APMV-1 APMV-2 APMV-3 APMV-4 APMV-6 163FSc APMV-7 APMV-8 APMV-9
rAPMV-6 HN 256a 2 8 <2 2 256 256 2 4 <2
APMV-1 <2 128 NTb NT NT <2 <2 NT NT NT
APMV-2 <2 NT 512 NT NT 8 32 NT NT NT
APMV-3 <2 NT NT 512 NT 16 <2 NT NT NT
APMV-4 <2 NT NT NT 32 <2 <2 NT NT NT
APMV-6 128 <2 16 <2 <2 512 64 4 2 <2
163FS 512 8 32 16 2 1024 256 8 16 2
APMV-7 16 NT NT NT NT <2 16 256 NT NT
APMV-8 <2 NT NT NT NT 2 4 NT 256 NT
APMV-9 <2 NT NT NT NT 8 8 NT NT 256
Negative serum <2 <2 <2 <2 <2 <2 <2 <2 <2 <2

a HI titers

b NT, not tested

c APMV-6 isolate (APMV-6/WB12-163FS) used as genetic template for rAPMV-6 HN.

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