Caging the Beast: TRIM5α Binding to the HIV-1 Core

The potent HIV-1 inhibitor TRIM5 alpha blocks HIV-1 infection by accelerating the uncoating of HIV-1. TRIM5 alpha is known to form higher-order self-association complexes that contribute to the avidity of TRIM5 alpha for the HIV-1 capsid, and are essential to inhibit infection; these higher-order self-association complexes are dependent upon an intact B-box 2 domain. Even though the ability to form higher-order self-association complexes resembles the clathrin triskelion that forms a protein array, or cage, around the endocytic vesicle, evidence for the ability of TRIM5 alpha to assemble a similar type of structure surrounding the HIV-1 core has been lacking. Recent work by Ganser-Pornillos, Chandrasekaran and colleagues has now demonstrated the ability of the restriction factor TRIM5 alpha to "cage" or "net" the HIV-1 core by forming an hexagonal array on the surface of the viral capsid [1]. This hexagonal array is strikingly similar in design to the array formed by the clathrin triskelion on the surface of the clathrin-coated endocytic vesicle. This remarkable finding represents an important advance on our understanding of the restriction factor TRIM5 alpha, and suggests that TRIM5 alpha cages the HIV-1 core in order to terminate infection. The present note discusses the implications of this discovery.