Viral envelope

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Many viruses (e.g. influenza and many animal viruses) have viral envelopes (or enveloped virus) covering their protein coats, or capsids. The envelopes are typically derived from portions of the host cell membranes (phospholipids and proteins), but include some viral glycoproteins. Functionally, viral envelopes are used to help viruses enter host cells. Glycoproteins on the surface of the envelope serve to identify and bind to receptor sites on the host's membrane. The viral envelope then fuses with the host's membrane, allowing the capsid and viral genome to enter and infect the host.

[edit] External links

• Flash animation at McGraw-Hill microbiology-Entry%20of%20enveloped%20viruses%20into%20cells

[edit] References

• [1]
• An animation of an enveloped virus attaching itself