The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus
<p>Abstract</p> <p>Background</p> <p>Transmissible gastroenteritis virus (TGEV) has a sialic acid binding activity that is believed to be important for enteropathogenicity, but that has so far appeared to be dispensable for infection of cultured cells. The aims of this...
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doaj-10935c11827b4fc1935251fe0edf03f22020-11-25T00:54:32ZengBMCVirology Journal1743-422X2011-09-018143510.1186/1743-422X-8-435The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirusEnjuanes LuisWinter ChristineBauer SandraSchwegmann-Weßels ChristelLaude HubertHerrler Georg<p>Abstract</p> <p>Background</p> <p>Transmissible gastroenteritis virus (TGEV) has a sialic acid binding activity that is believed to be important for enteropathogenicity, but that has so far appeared to be dispensable for infection of cultured cells. The aims of this study were to determine the effect of sialic acid binding for the infection of cultured cells under unfavorable conditions, and comparison of TGEV strains and mutants, as well as the avian coronavirus IBV concerning their dependence on the sialic acid binding activity.</p> <p>Methods</p> <p>The infectivity of different viruses was analyzed by a plaque assay after adsorption times of 5, 20, and 60 min. Prior to infection, cultured cells were either treated with neuraminidase to deplete sialic acids from the cell surface, or mock-treated. In a second approach, pre-treatment of the virus with porcine intestinal mucin was performed, followed by the plaque assay after a 5 min adsorption time. A student's t-test was used to verify the significance of the results.</p> <p>Results</p> <p>Desialylation of cells only had a minor effect on the infection by TGEV strain Purdue 46 when an adsorption period of 60 min was allowed for initiation of infection. However, when the adsorption time was reduced to 5 min the infectivity on desialylated cells decreased by more than 60%. A TGEV PUR46 mutant (HAD3) deficient in sialic acid binding showed a 77% lower titer than the parental virus after a 5 min adsorption time. After an adsorption time of 60 min the titer of HAD3 was 58% lower than that of TGEV PUR46. Another TGEV strain, TGEV Miller, and IBV Beaudette showed a reduction in infectivity after neuraminidase treatment of the cultured cells irrespective of the virion adsorption time.</p> <p>Conclusions</p> <p>Our results suggest that the sialic acid binding activity facilitates the infection by TGEV under unfavorable environmental conditions. The dependence on the sialic acid binding activity for an efficient infection differs in the analyzed TGEV strains.</p> http://www.virologyj.com/content/8/1/435coronavirus S proteinsialic acid binding activityTGEVIBVcultured cells |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Enjuanes Luis Winter Christine Bauer Sandra Schwegmann-Weßels Christel Laude Hubert Herrler Georg |
spellingShingle |
Enjuanes Luis Winter Christine Bauer Sandra Schwegmann-Weßels Christel Laude Hubert Herrler Georg The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus Virology Journal coronavirus S protein sialic acid binding activity TGEV IBV cultured cells |
author_facet |
Enjuanes Luis Winter Christine Bauer Sandra Schwegmann-Weßels Christel Laude Hubert Herrler Georg |
author_sort |
Enjuanes Luis |
title |
The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus |
title_short |
The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus |
title_full |
The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus |
title_fullStr |
The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus |
title_full_unstemmed |
The sialic acid binding activity of the S protein facilitates infection by porcine transmissible gastroenteritis coronavirus |
title_sort |
sialic acid binding activity of the s protein facilitates infection by porcine transmissible gastroenteritis coronavirus |
publisher |
BMC |
series |
Virology Journal |
issn |
1743-422X |
publishDate |
2011-09-01 |
description |
<p>Abstract</p> <p>Background</p> <p>Transmissible gastroenteritis virus (TGEV) has a sialic acid binding activity that is believed to be important for enteropathogenicity, but that has so far appeared to be dispensable for infection of cultured cells. The aims of this study were to determine the effect of sialic acid binding for the infection of cultured cells under unfavorable conditions, and comparison of TGEV strains and mutants, as well as the avian coronavirus IBV concerning their dependence on the sialic acid binding activity.</p> <p>Methods</p> <p>The infectivity of different viruses was analyzed by a plaque assay after adsorption times of 5, 20, and 60 min. Prior to infection, cultured cells were either treated with neuraminidase to deplete sialic acids from the cell surface, or mock-treated. In a second approach, pre-treatment of the virus with porcine intestinal mucin was performed, followed by the plaque assay after a 5 min adsorption time. A student's t-test was used to verify the significance of the results.</p> <p>Results</p> <p>Desialylation of cells only had a minor effect on the infection by TGEV strain Purdue 46 when an adsorption period of 60 min was allowed for initiation of infection. However, when the adsorption time was reduced to 5 min the infectivity on desialylated cells decreased by more than 60%. A TGEV PUR46 mutant (HAD3) deficient in sialic acid binding showed a 77% lower titer than the parental virus after a 5 min adsorption time. After an adsorption time of 60 min the titer of HAD3 was 58% lower than that of TGEV PUR46. Another TGEV strain, TGEV Miller, and IBV Beaudette showed a reduction in infectivity after neuraminidase treatment of the cultured cells irrespective of the virion adsorption time.</p> <p>Conclusions</p> <p>Our results suggest that the sialic acid binding activity facilitates the infection by TGEV under unfavorable environmental conditions. The dependence on the sialic acid binding activity for an efficient infection differs in the analyzed TGEV strains.</p> |
topic |
coronavirus S protein sialic acid binding activity TGEV IBV cultured cells |
url |
http://www.virologyj.com/content/8/1/435 |
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