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Journal of Virology, March 1999, p. 2045-2051, Vol. 73, No. 3
Department of Microbiology and Immunology,
Pennsylvania State University College of Medicine, Hershey,
Pennsylvania 17033
Received 22 July 1998/Accepted 2 December 1998
Rous sarcoma virus (RSV) and murine leukemia virus (MLV) are
examples of distantly related retroviruses that normally do not encounter one another in nature. Their Gag proteins direct particle assembly at the plasma membrane but possess very little sequence similarity. As expected, coexpression of these two Gag proteins did not
result in particles that contain both. However, when the N-terminal
membrane-binding domain of each molecule was replaced with that of the
Src oncoprotein, which is also targeted to the cytoplasmic face of the
plasma membrane, efficient copackaging was observed in genetic
complementation and coimmunoprecipitation assays. We hypothesize that
the RSV and MLV Gag proteins normally use distinct locations on the
plasma membrane for particle assembly but otherwise have assembly
domains that are sufficiently similar in function (but not sequence) to
allow heterologous interactions when these proteins are redirected to a
common membrane location.
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Conditions for Copackaging Rous Sarcoma Virus and
Murine Leukemia Virus Gag Proteins during Retroviral Budding
and
*
Corresponding author. Mailing address: Department of
Microbiology and Immunology, Pennsylvania State University College of Medicine, 500 University Dr., P. O. Box 850, Hershey, PA 17033. Phone: (717) 531-3528. Fax: (717) 531-6522. E-mail:
jwills{at}psu.edu.
Present address: Invitrogen Corporation, Carlsbad, CA 92008.
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