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Letter

Nature Cell Biology 9, 838–846 (1 July 2007) | doi:10.1038/ncb1610

Filamin-A regulates actin-dependent clustering of HIV receptors

Sonia Jim|[eacute]|nez-Baranda , Concepci|[oacute]|n G|[oacute]|mez-Mout|[oacute]|n , Ana Rojas , Lorena Mart|[iacute]|nez-Prats , Emilia Mira , Rosa Ana Lacalle , Alfonso Valencia , Dimiter S. Dimitrov , Antonella Viola , Rafael Delgado , Carlos Mart|[iacute]|nez-A. & Santos Ma|[ntilde]|es

Human immunodeficiency virus (HIV)-1 infection requires envelope (Env) glycoprotein gp120-induced clustering of CD4 and coreceptors (CCR5 or CXCR4) on the cell surface; this enables Env gp41 activation and formation of a complex that mediates fusion between Env-containing and target-cell membranes. Kinetic studies show that viral receptors are actively transported to the Env-receptor interface in a process that depends on plasma membrane composition and the actin cytoskeleton.