نتایج جستجو برای: apobec3g

تعداد نتایج: 713  

Journal: :PLoS Pathogens 2009
Michael L. Vetter Megan E. Johnson Amanda K. Antons Derya Unutmaz Richard T. D'Aquila

The cytidine deaminases APOBEC3G and APOBEC3F exert anti-HIV-1 activity that is countered by the HIV-1 vif protein. Based on potential transcription factor binding sites in their putative promoters, we hypothesized that expression of APOBEC3G and APOBEC3F would vary with T helper lymphocyte differentiation. Naive CD4+ T lymphocytes were differentiated to T helper type 1 (Th1) and 2 (Th2) effect...

Journal: :Future microbiology 2008
Melissa A Farrow Ann M Sheehy

It is now 26 years after the first published report on HIV, and the global epidemic continues unabated, with estimates of over 33 million people currently infected, worldwide. Development of targeted therapies aimed at perturbing the HIV life cycle can be achieved only with a detailed comprehension of the dynamics of virus-host interactions within the cell. One such critical virus-host interact...

Journal: :Journal of virology 2003
Sandra Kao Mohammad A Khan Eri Miyagi Ron Plishka Alicia Buckler-White Klaus Strebel

Replication of human immunodeficiency virus type 1 (HIV-1) in most primary cells and some immortalized T-cell lines depends on the activity of the viral infectivity factor (Vif). Vif has the ability to counteract a cellular inhibitor, recently identified as CEM15, that blocks infectivity of Vif-defective HIV-1 variants. CEM15 is identical to APOBEC3G and belongs to a family of proteins involved...

2009
Guylaine Haché Reuben S. Harris

Human APOBEC3G inhibits the replication of Vif-deficient HIV-1 by hypermutating nascent viral cDNA (reviewed in [1– 3]). Zheng and colleagues recently reported that the HIV-1 restriction activity of APOBEC3G requires a cellular co-factor [4]. Their conclusion depended on three critical observations: i) CEM-T4 cells support the replication of Vif-deficient HIV-1, ii) CEM-T4 cells express restric...

2013
Annabel Krupp Kevin R. McCarthy Marcel Ooms Michael Letko Jennifer S. Morgan Viviana Simon Welkin E. Johnson

Cellular restriction factors, which render cells intrinsically resistant to viruses, potentially impose genetic barriers to cross-species transmission and emergence of viral pathogens in nature. One such factor is APOBEC3G. To overcome APOBEC3G-mediated restriction, many lentiviruses encode Vif, a protein that targets APOBEC3G for degradation. As with many restriction factor genes, primate APOB...

Journal: :The journal of medical investigation : JMI 2010
Tamiko Nagao Tomoki Yamashita Ariko Miyake Tsuneo Uchiyama Masako Nomaguchi Akio Adachi

We examined a series of site-directed point mutants of human immunodeficiency virus type 1 (HIV-1) Vif for their interaction with cellular anti-viral factors APOBEC3G/APOBEC3F. Mutant viruses that display growth-defect in H9 cells did not counteract effectively APOBEC3G and/or APOBEC3F without exception, as monitored by single-cycle infectivity assays. While growth-defective mutants of Vif C-te...

Journal: :Cell 2003
Roberto Mariani Darlene Chen Bärbel Schröfelbauer Francisco Navarro Renate König Brooke Bollman Carsten Münk Henrietta Nymark-McMahon Nathaniel R. Landau

The HIV-1 accessory protein Vif (virion infectivity factor) is required for the production of infectious virions by CD4(+) lymphocytes. Vif facilitates particle infectivity by blocking the inhibitory activity of APOBEC3G (CEM15), a virion-encapsidated cellular protein that deaminates minus-strand reverse transcript cytosines to uracils. We report that HIV-1 Vif forms a complex with human APOBEC...

Journal: :Journal of virology 2008
Mark D Stenglein Hiroshi Matsuo Reuben S Harris

APOBEC3G limits the replication of human immunodeficiency virus type 1, other retroviruses, and retrotransposons. It localizes predominantly to the cytoplasm of cells, which is consistent with a model wherein cytosolic APOBEC3G packages into assembling virions, where it exerts its antiviral effect by deaminating viral cDNA cytosines during reverse transcription. To define the domains of APOBEC3...

Journal: :Current Biology 2003
Silvestro G Conticello Reuben S Harris Michael S Neuberger

APOBEC3G is a human cellular enzyme that is incorporated into retroviral particles and acts to restrict retroviral replication in infected cells by deaminating dC to dU in the first (minus)-strand cDNA replication intermediate. HIV, however, encodes a protein (virion infectivity factor, Vif ), which overcomes APOBEC3G-mediated restriction but by an unknown mechanism. Here, we show that Vif trig...

Journal: :Journal of virology 2004
Véronique Zennou David Perez-Caballero Heinrich Göttlinger Paul D Bieniasz

APOBEC3G is promiscuous with respect to its antiretroviral effect, requiring that it be packaged into diverse retrovirus particles. Here, we show that most virally encoded human immunodeficiency virus type 1 particle components are dispensable for APOPEC3G incorporation. However, replacement of the nucleocapsid (NC) Gag domain with a leucine zipper abolished APOBEC3G incorporation. Moreover, co...

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