Duck and Human Pandemic Influenza A Viruses Retain Sialidase Activity under Low pH Conditions
Identifieur interne : 000135 ( 1968/Analysis ); précédent : 000134; suivant : 000136Duck and Human Pandemic Influenza A Viruses Retain Sialidase Activity under Low pH Conditions
Auteurs : Tadanobu Takahashi ; Yasuo Suzuki [Japon] ; Daisuke Nishinaka ; Nana Kawase ; Yukiko Kobayashi ; Kazuya I.-P. Jwa Hindari ; Daisei Miyamoto ; Chan-Tan Guo ; Kennedy F. Shortridge [République populaire de Chine] ; Takashi Suzuki [Japon]Source :
- The Journal of Biochemistry [ 0021-924X ] ; 2001.
Abstract
The majority of influenza A viruses isolated from wild birds, but not humans, can replicate in the duck intestinal tract. Here we demonstrate that all duck isolates tested universally retain sialidase activities under low pH conditions independent of their neu-raminidase (NA) subtypes. In contrast, the sialidase activities of most isolates from humans and pigs practically disappear below pH 4.5, with the exception of four human pandemic viruses isolated in 1957 and 1968. Sequence comparisons among duck, human, and swine N2 NA subtypes indicate that amino acids at positions 153, 253, 307, 329, 344, 347, 356, 368, 390, and 431 may be associated with the low pH stability of duck and human pandemic N2 NAs. This finding suggests that the low pH stability of duck influenza A virus NA may be a critical factor for replication in the intestinal tract through the digestive tract of ducks, and that the properties of NAs are important for understanding the epidemiology of the influenza virus.
Url:
DOI: 10.1093/oxfordjournals.jbchem.a002983
Affiliations:
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Jwa" last="Hindari">Kazuya I.-P. Jwa Hindari</name><affiliation><wicri:noCountry code="subField">422-8526</wicri:noCountry></affiliation></author><author><name sortKey="Miyamoto, Daisei" sort="Miyamoto, Daisei" uniqKey="Miyamoto D" first="Daisei" last="Miyamoto">Daisei Miyamoto</name><affiliation><wicri:noCountry code="subField">422-8526</wicri:noCountry></affiliation></author><author><name sortKey="Guo, Chan Tan" sort="Guo, Chan Tan" uniqKey="Guo C" first="Chan-Tan" last="Guo">Chan-Tan Guo</name><affiliation><wicri:noCountry code="subField">422-8526</wicri:noCountry></affiliation></author><author><name sortKey="Shortridge, Kennedy F" sort="Shortridge, Kennedy F" uniqKey="Shortridge K" first="Kennedy F." last="Shortridge">Kennedy F. 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Here we demonstrate that all duck isolates tested universally retain sialidase activities under low pH conditions independent of their neu-raminidase (NA) subtypes. In contrast, the sialidase activities of most isolates from humans and pigs practically disappear below pH 4.5, with the exception of four human pandemic viruses isolated in 1957 and 1968. Sequence comparisons among duck, human, and swine N2 NA subtypes indicate that amino acids at positions 153, 253, 307, 329, 344, 347, 356, 368, 390, and 431 may be associated with the low pH stability of duck and human pandemic N2 NAs. This finding suggests that the low pH stability of duck influenza A virus NA may be a critical factor for replication in the intestinal tract through the digestive tract of ducks, and that the properties of NAs are important for understanding the epidemiology of the influenza virus.</div></front></TEI><affiliations><list><country><li>Japon</li><li>République populaire de Chine</li></country></list><tree><noCountry><name sortKey="Guo, Chan Tan" sort="Guo, Chan Tan" uniqKey="Guo C" first="Chan-Tan" last="Guo">Chan-Tan Guo</name><name sortKey="Hindari, Kazuya I P Jwa" sort="Hindari, Kazuya I P Jwa" uniqKey="Hindari K" first="Kazuya I.-P. Jwa" last="Hindari">Kazuya I.-P. Jwa Hindari</name><name sortKey="Kawase, Nana" sort="Kawase, Nana" uniqKey="Kawase N" first="Nana" last="Kawase">Nana Kawase</name><name sortKey="Kobayashi, Yukiko" sort="Kobayashi, Yukiko" uniqKey="Kobayashi Y" first="Yukiko" last="Kobayashi">Yukiko Kobayashi</name><name sortKey="Miyamoto, Daisei" sort="Miyamoto, Daisei" uniqKey="Miyamoto D" first="Daisei" last="Miyamoto">Daisei Miyamoto</name><name sortKey="Nishinaka, Daisuke" sort="Nishinaka, Daisuke" uniqKey="Nishinaka D" first="Daisuke" last="Nishinaka">Daisuke Nishinaka</name><name sortKey="Takahashi, Tadanobu" sort="Takahashi, Tadanobu" uniqKey="Takahashi T" first="Tadanobu" last="Takahashi">Tadanobu Takahashi</name></noCountry><country name="Japon"><noRegion><name sortKey="Suzuki, Yasuo" sort="Suzuki, Yasuo" uniqKey="Suzuki Y" first="Yasuo" last="Suzuki">Yasuo Suzuki</name></noRegion><name sortKey="Suzuki, Takashi" sort="Suzuki, Takashi" uniqKey="Suzuki T" first="Takashi" last="Suzuki">Takashi Suzuki</name><name sortKey="Suzuki, Takashi" sort="Suzuki, Takashi" uniqKey="Suzuki T" first="Takashi" last="Suzuki">Takashi Suzuki</name><name sortKey="Suzuki, Yasuo" sort="Suzuki, Yasuo" uniqKey="Suzuki Y" first="Yasuo" last="Suzuki">Yasuo Suzuki</name></country><country name="République populaire de Chine"><noRegion><name sortKey="Shortridge, Kennedy F" sort="Shortridge, Kennedy F" uniqKey="Shortridge K" first="Kennedy F." last="Shortridge">Kennedy F. 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