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Foamy Retrovirus Integrase Contains a Pol Dimerization Domain Required for Protease Activation

  1. Author:
    Lee, E. G.
    Roy, J.
    Jackson, D.
    Clark, P.
    Boyer, P. L.
    Hughes, S. H.
    Linial, M. L.

  2. Author Address

    [Lee, Eun-Gyung; Roy, Jacqueline; Jackson, Dana; Linial, Maxine L.] Fred Hutchinson Canc Res Ctr, Div Basic Sci, Seattle, WA 98109 USA. [Clark, Patrick] SAIC Frederick, Basic Sci Program, Frederick, MD 21702 USA. [Boyer, Paul L.; Hughes, Stephen H.] Natl Canc Res Inst Frederick, HIV Drug Resistance Program, Frederick, MD 21702 USA.;Hughes, SH, NCI, POB B, Frederick, MD 21783 USA.;hughesst@mail.nih.gov
    1. Year: 2011
    2. Date: Feb
  2. Journal: Journal of Virology
    1. 85
    2. 4
    3. Pages: 1655-1661
  4. Type of Article: Article
  5. ISSN: 0022-538X
  1. Abstract:

    Unlike orthoretroviruses, foamy retroviruses (FV) synthesize Pol independently of Gag. The FV Pol precursor is cleaved only once between reverse transcriptase (RT) and integrase (IN) by the protease (PR), resulting in a PR-RT and an IN protein. Only the Pol precursor, not the cleaved subunits, is packaged into virions. Like orthoretroviral PRs, FV PR needs to dimerize to be active. Previously, we showed that a Pol mutant lacking IN has defects in PR activity and Pol packaging into virions. We now show that introduction of a leucine zipper (zip) dimerization motif in an IN truncation mutant can restore PR activity, leading to Pol processing in cells. However, these zip mutants neither cleave Gag nor incorporate Pol into virions. We propose that IN is required for Pol dimerization, which is necessary for the creation of a functional PR active site.

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External Sources

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  2. DOI: 10.1128/jvi.01873-09
  3. View record in Web of Science®
  4. WOS: 000286420900023

Library Notes

  1. Fiscal Year: FY2010-2011
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