title: Comparative requirements for the restriction of retrovirus infection by TRIM5alpha and TRIMCyp.
abstract: The restriction factors, TRIM5alpha in most primates and TRIMCyp in owl monkeys, block infection of various retroviruses soon after virus entry into the host cell. Rhesus monkey TRIM5alpha (TRIM5alpha rh) inhibits human immunodeficiency virus (HIV-1) and feline immunodeficiency virus (FIV) more potently than human TRIM5alpha (TRIM5alpha hu). TRIMCyp restricts infection of HIV-1, simian immunodeficiency virus of African green monkeys (SIV agm) and FIV. Early after infection, TRIMCyp, like TRIM5alpha rh and TRIM5alpha hu, decreased the amount of particulate viral capsid in the cytosol of infected cells. The requirements for the TRIMCyp and TRIM5alpha domains in restricting different retroviruses were investigated. Potent restriction of FIV by TRIMCyp occurred in the complete absence of RING and B-box 2 domains; by contrast, efficient FIV restriction by TRIM5alpha rh required these domains. Variable region 1 of the TRIM5alpha rh B30.2 domain contributed to the potency of HIV-1, FIV and equine infectious anemia virus restriction. Thus, although differences exist in the requirements of TRIMCyp and TRIM5alpha for RING/B-box 2 domains, both restriction factors exhibit mechanistic similarities.
authors.affiliation: Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Department of Pathology, Division of AIDS, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Felipe
authors.initials: F
authors.lastname: Diaz-Griffero
authors.forename: Alak
authors.initials: A
authors.lastname: Kar
authors.forename: Mark
authors.initials: M
authors.lastname: Lee
authors.forename: Matthew
authors.initials: M
authors.lastname: Stremlau
authors.forename: Eric
authors.initials: E
authors.lastname: Poeschla
authors.forename: Joseph
authors.initials: J
authors.lastname: Sodroski
mesh_terms: D000818:Animals; D000090103:Antiviral Restriction Factors; D016645:Aotidae; D002213:Capsid / Q000502:physiology; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D002415:Cats; D002460:Cell Line; D015497:HIV-1 / Q000235:genetics / Q000502:physiology; D006801:Humans; D016089:Immunodeficiency Virus, Feline / Q000235:genetics / Q000502:physiology; D017434:Protein Structure, Tertiary; D011506:Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D012192:Retroviridae Infections / Q000503:physiopathology* / Q000821:virology; D000070584:Tripartite Motif Proteins; D044767:Ubiquitin-Protein Ligases
chemical_list: D000090103:Antiviral Restriction Factors; D002352:Carrier Proteins; D011506:Proteins; D000070584:Tripartite Motif Proteins; C477346:TRIM5 protein, human; C482587:TRIM5(alpha) protein, rhesus monkey; D044767:Ubiquitin-Protein Ligases