Myristylation of Pr60gag of the murine AIDS-defective virus is required to induce disease and notably for the expansion of its target cells.
AUTOR(ES)
Huang, M
RESUMO
Murine AIDS (MAIDS) is characterized by severe lymphadenopathy and splenomegaly. The proliferation of the infected target B cells is also an important manifestation of the disease (M. Huang, C. Simard, D. G. Kay, and P. Jolicoeur, J. Virol. 65:6562-6571, 1991). The etiologic agent of MAIDS is a defective murine leukemia virus that is deleted of most of its pol and env genes and appears to encode a single protein, the Gag precursor Pr60gag protein. Pr60gag is myristylated and attached to the plasma membrane. To study the role myristylation on the function of Pr60gag, we have generated a myristylation-negative (Myr-) mutant of the MAIDS defective virus. We found that Myr- Pr60gag interacted less tightly with the plasma membrane. In addition, the Myr- MAIDS defective virus mutant was unable to induce expansion of infected cells and was nonpathogenic. These results emphasize the essential role of Pr60gag in the disease process. Our data also suggest that Pr60gag, once recruited to the cell membrane through its myristylation, interacts with other membrane-bound effectors to send signals to induce proliferation of the infected cells and to initiate immune dysfunctions.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=236966Documentos Relacionados
- Mutational analysis of the murine AIDS-defective viral genome reveals a high reversion rate in vivo and a requirement for an intact Pr60gag protein for efficient induction of disease.
- Myristylation site in Pr65gag is essential for virus particle formation by Moloney murine leukemia virus.
- The murine AIDS defective provirus acts as an insertional mutagen in its infected target B cells.
- A subset of Pr65gag is nucleus associated in murine leukemia virus-infected cells.
- Susceptibility of inbred strains of mice to murine AIDS (MAIDS) correlates with target cell expansion and high expression of defective MAIDS virus.