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Nature 424, 21-22 (3 July 2003) | doi:10.1038/424021a

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Yapeng Gu & Wesley I. Sundquist

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A powerful arm of the cellular defence against microbial invaders has been characterized. APOBEC3G, a protein that can fight off HIV, works by introducing 'typographical errors' during viral replication.

HIV encodes a protein that allows the virus to multiply in otherwise resistant human cells1, 2, 3. This protein, Vif — for 'viral infectivity factor' — works by overcoming a cellular protein, APOBEC3G, whose task is to inhibit the replication of HIV and other retroviruses4.

  1. Yapeng Gu and Wesley I. Sundquist are in the Department of Biochemistry, University of Utah, Salt Lake City, Utah 84132, USA.

Correspondence to: Wesley I. Sundquist e-mail: Email: wes@biochem.utah.edu