Viral infectivity

Discussion in 'Step I' started by TerpMD, Jun 13, 2008.

  1. TerpMD

    Joined:
    Sep 26, 2007
    Messages:
    129
    Likes Received:
    1
    Status:
    Resident [Any Field]
    In FA it says that purified nucleic acids of most dsDNA viruses (- pox, HBV) are infectious. I thought infective meant that the virus could go in and immediately start to make protein, hence why +sense RNA were infectious. Am I missing something here? Can someone please explain? Thanks in advance!
     
  2. Thread continues after this sponsor message. SDN Members do not see this ad.

  3. osli

    osli Senior Member

    Joined:
    Oct 13, 2005
    Messages:
    1,279
    Likes Received:
    4
    Status:
    Medical Student
    I think it is because those viruses can utilize the machinery of the host cell to translate and replicate, and don't need to carry their own enzymes along, right? Pox replicates in the cytoplasm and uses a lot of its own machinery (thus "naked" DNA is not infectious), and HBV... well I don't remember why. :laugh: Oh... it carries it's own reverse transcriptase... not sure why, I guess I better go review how it translates and replicates. :oops:

    So +ssRNA and dsDNA sequences + host cell = all you need to produce proteins and progeny. For the others, you need a virus specific enzyme(s) that's carried in the capsid.

    OK, someone check me on that to make sure I'm not bonkers.
     

Share This Page