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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

TRIM5alpha association with cytoplasmic bodies is not required for antiretroviral activity.

The tripartite motif (TRIM) protein, TRIM5alpha, restricts infection by particular retroviruses. Many TRIM proteins form cytoplasmic bodies of unknown function. We investigated the relationship between cytoplasmic body formation and the structure and antiretroviral activity of TRIM5alpha. In addition to diffuse cytoplasmic staining, the TRIM5alpha proteins from several primate species were located in cytoplasmic bodies of different sizes; by contrast, TRIM5alpha from spider monkeys did not form cytoplasmic bodies. Despite these differences, all of the TRIM5alpha proteins exhibited the ability to restrict infection by particular retroviruses. Treatment of cells with geldanamycin, an Hsp90 inhibitor, resulted in disappearance or reduction of the TRIM5alpha-associated cytoplasmic bodies, yet exerted little effect on the restriction of retroviral infection. Studies of green fluorescent protein-TRIM5alpha fusion proteins indicated that no TRIM5alpha domain is specifically required for association with cytoplasmic bodies. Apparently, the formation of cytoplasmic bodies is not required for the antiretroviral activity of TRIM5alpha.[1]


  1. TRIM5alpha association with cytoplasmic bodies is not required for antiretroviral activity. Song, B., Diaz-Griffero, F., Park, d.o. .H., Rogers, T., Stremlau, M., Sodroski, J. Virology (2005) [Pubmed]
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