PMID:16537614

Citation	Hiraragi, H, Kim, SJ, Phipps, AJ, Silic-Benussi, M, Ciminale, V, Ratner, L, Green, PL and Lairmore, MD (2006) Human T-lymphotropic virus type 1 mitochondrion-localizing protein p13(II) is required for viral infectivity in vivo. J. Virol. 80:3469-76
Abstract	Human T-lymphotropic virus type 1 (HTLV-1), the etiological agent of adult T-cell leukemia, encodes unique regulatory and accessory proteins in the pX region of the provirus, including the open reading frame II product p13(II). p13(II) localizes to mitochondria, binds farnesyl pyrophosphate synthetase, an enzyme involved in posttranslational farnesylation of Ras, and alters Ras-dependent cell signaling and control of apoptosis. The role of p13(II) in virus infection in vivo remains undetermined. Herein, we analyzed the functional significance of p13(II) in HTLV-1 infection. We compared the infectivity of a human B-cell line that harbors an infectious molecular clone of HTLV-1 with a selective mutation that prevents the translation of p13(II) (729.ACH.p13) to the infectivity of a wild-type HTLV-1-expressing cell line (729.ACH). 729.ACH and 729.ACH.p13 producer lines had comparable infectivities for cultured rabbit peripheral blood mononuclear cells (PBMC), and the fidelity of the start codon mutation in ACH.p13 was maintained after PBMC passage. In contrast, zero of six rabbits inoculated with 729.ACH.p13 cells failed to establish viral infection, whereas six of six rabbits inoculated with wild-type HTLV-1-expressing cells (729.ACH) were infected as measured by antibody responses, proviral load, and HTLV-1 p19 matrix antigen production from ex vivo-cultured PBMC. Our data are the first to indicate that the HTLV-1 mitochondrion-localizing protein p13(II) has an essential biological role during the early phase of virus infection in vivo.
Links	PubMed PMC1440407 Online version:10.1128/JVI.80.7.3469-3476.2006
Keywords	Animals; Antibodies, Viral/metabolism; Blotting, Western; Cell Line, Tumor; Cells, Cultured; Coculture Techniques; Codon, Initiator; Disease Models, Animal; Enzyme-Linked Immunosorbent Assay; Female; Gene Products, gag/blood; Genome, Viral; Geranyltranstransferase/physiology; HTLV-I Infections/virology; Human T-lymphotropic virus 1/genetics; Human T-lymphotropic virus 1/immunology; Human T-lymphotropic virus 1/pathogenicity; Human T-lymphotropic virus 1/physiology; Humans; Leukocytes, Mononuclear/virology; Mitochondria/enzymology; Mutation; Polymerase Chain Reaction; Proviruses/genetics; Proviruses/isolation & purification; Rabbits; Retroviridae Proteins, Oncogenic/blood; Viral Load; gag Gene Products, Human Immunodeficiency Virus
edit table

Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
9DELA:C6L855		GO:0019058: viral infectious cycle	ECO:0000315:		P		Figure 4 shows that the antibody response against HTLV-1 in rabbits inoculated with a mutated proviral gene (no p13 expression) was non-existent when compared to antibody response in rabbits inoculated with wild type HTLV-1 provirus. This shows the p13 protein plays an important function in HTLV-1 infection.	complete

References

See Help:References for how to manage references in GONUTS.