User:Amy Kerzmann/Sandbox 1
From Proteopedia
(→Inhibition of the M2 Channel from Influenza A) |
(→Inhibition of the M2 Channel from Influenza A) |
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Influenza A virions bind to host cells via interactions between hemagglutinin and host cell gangliosides (or sialyated proteins), which trigger receptor-mediated endocytosis. As the virion-containing endosomes are acidified during the typical maturation process, hemagglutin undergoes a conformational change that leads to membrane fusion. Simultaneously, the M2 channel is activated by the acidic conditions, permitting the flow of proteins from the endosomal lumen to the inside of the viral envelope. This acidification process enhances the rate of viral uncoating that releases viral RNA and other components into the cytosol of the infected cell. In this manner, the function of the M2 channel is essential for viral infectivity. | Influenza A virions bind to host cells via interactions between hemagglutinin and host cell gangliosides (or sialyated proteins), which trigger receptor-mediated endocytosis. As the virion-containing endosomes are acidified during the typical maturation process, hemagglutin undergoes a conformational change that leads to membrane fusion. Simultaneously, the M2 channel is activated by the acidic conditions, permitting the flow of proteins from the endosomal lumen to the inside of the viral envelope. This acidification process enhances the rate of viral uncoating that releases viral RNA and other components into the cytosol of the infected cell. In this manner, the function of the M2 channel is essential for viral infectivity. | ||
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Channel Structure: | Channel Structure: | ||
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Channel Function: | Channel Function: | ||
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| - | The proton-transport mechanism of the M2 channel is not fully deciphered, but the recent elucidation of several structures with the | + | The proton-transport mechanism of the M2 channel is not fully deciphered, but the recent elucidation of several structures with the inhibitors (including amantadine and rimantadine) are providing details that will soon lead to a more complete understanding of this protein. Such developments offer hope that specific treatments for seasonal, as well as pandemic, influenza can be developed. |
References | References | ||
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Revision as of 04:43, 18 September 2009
Inhibition of the M2 Channel from Influenza A
Overview of Normal Function:
Influenza A virions bind to host cells via interactions between hemagglutinin and host cell gangliosides (or sialyated proteins), which trigger receptor-mediated endocytosis. As the virion-containing endosomes are acidified during the typical maturation process, hemagglutin undergoes a conformational change that leads to membrane fusion. Simultaneously, the M2 channel is activated by the acidic conditions, permitting the flow of proteins from the endosomal lumen to the inside of the viral envelope. This acidification process enhances the rate of viral uncoating that releases viral RNA and other components into the cytosol of the infected cell. In this manner, the function of the M2 channel is essential for viral infectivity.
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Channel Structure:
The M2 proton channel of influenza A is a homotetramer. The central core of this protein is comprised of four transmembrane helices, one from each monomeric subunit.
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Channel Function:
The proton-transport mechanism of the M2 channel is not fully deciphered, but the recent elucidation of several structures with the inhibitors (including amantadine and rimantadine) are providing details that will soon lead to a more complete understanding of this protein. Such developments offer hope that specific treatments for seasonal, as well as pandemic, influenza can be developed.
References
