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netLibrary - eBook Summary Structure-based Drug Design by ...

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Document<br />

Figure 1<br />

A schematic diagram of an influenza virus particle that illustrates<br />

its constituent components and morphology. The surface antigens hemagglutinin<br />

and neuraminidase are attached to the lipid and matrix protein shell that<br />

encapsulates the eight negative-stranded RNA genes of the virus and<br />

associated nucleoprotein and polymerase.<br />

Page 460<br />

cleaves terminal sialic acid) and which appear as spikes protruding out of the viral envelope. The viral<br />

target in humans is the upper respiratory tract epithelial cells. Replication (see Figure 2) begins with<br />

penetration of the virion through the mucin layer covering the epithelial surface, followed <strong>by</strong> attachment<br />

to the viral receptor <strong>by</strong> the hemagglutinin. Penetration of the cell is achieved <strong>by</strong> endocytosis and the<br />

virion core is released after the fusion of the virion and vesicle membrane mediated <strong>by</strong> the<br />

hemagglutinin. Fusion is enabled <strong>by</strong> a conformational change in the hemagglutinin made possible <strong>by</strong><br />

lowering the pH of the endosome <strong>by</strong> the M2 ion channel protein. Following replication, the progeny<br />

virions are released <strong>by</strong> budding off the cell membrane [4,5].<br />

http://legacy.netlibrary.com/nlreader/nlReader.dll?bookid=12640&filename=Page_460.html (1 of 2) [4/9/2004 12:12:42 AM]

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