Skip NavigationSkip to Content

Retroviruses Human Immunodeficiency Virus and Murine Leukemia Virus Are Enriched in Phosphoinositides

  1. Author:
    Chan, R.
    Uchil, P. D.
    Jin, J.
    Shui, G. H.
    Ott, D. E.
    Mothes, W.
    Wenk, M. R.
  2. Author Address

    Wenk, Markus R.] Natl Univ Singapore, Yong Loo Lin Sch Med, Ctr Life Sci, Dept Biochem, Singapore 117607, Singapore. [Wenk, Markus R.] Natl Univ Singapore, Dept Biol Sci, Singapore 117607, Singapore. [Uchil, Pradeep D.; Jin, Jing, Mothes, Walther] Yale Univ, Sch Med, Dept Microbial Pathogenesis, New Haven, CT USA. [Ott, David E.] NCI, SAIC Frederick Inc, Frederick, MD 21701 USA.
    1. Year: 2008
  1. Journal: Journal of Virology
    1. 82
    2. 22
    3. Pages: 11228-11238
  2. Type of Article: Article
  1. Abstract:

    Retroviruses acquire a lipid envelope during budding from the membrane of their hosts. Therefore, the composition of this envelope can provide important information about the budding process and its location. Here, we present mass spectrometry analysis of the lipid content of human immunodeficiency virus type 1 (HIV-1) and murine leukemia virus (MLV). The results of this comprehensive survey found that the overall lipid content of these viruses mostly matched that of the plasma membrane, which was considerably different from the total lipid content of the cells. However, several lipids are enriched in comparison to the composition of the plasma membrane: (i) cholesterol, ceramide, and GM3, and (ii) phosphoinositides, phosphorylated derivatives of phosphatidylinositol. Interestingly, microvesicles, which are similar in size to viruses and are also released from the cell periphery, lack phosphoinositides, suggesting a different budding mechanism/location for these particles than for retroviruses. One phosphoinositide, phosphatidylinositol 4,5-bisphosphate [ PI( 4,5) P 2], has been implicated in membrane binding by HIV Gag. Consistent with this observation, we found that PI(4,5)P-2 was enriched in HIV-1 and that depleting this molecule in cells reduced HIV-1 budding. Analysis of mutant virions mapped the enrichment of PI(4,5)P-2 to the matrix domain of HIV Gag. Overall, these results suggest that HIV-1 and other retroviruses bud from cholesterol-rich regions of the plasma membrane and exploit matrix/PI(4,5)P-2 interactions for particle release from cells.

    See More

External Sources

  1. PMID: 18799574

Library Notes

  1. No notes added.
NCI at Frederick

You are leaving a government website.

This external link provides additional information that is consistent with the intended purpose of this site. The government cannot attest to the accuracy of a non-federal site.

Linking to a non-federal site does not constitute an endorsement by this institution or any of its employees of the sponsors or the information and products presented on the site. You will be subject to the destination site's privacy policy when you follow the link.

ContinueCancel