Stoichiometry of the Antiviral Protein Apobec3g in Hiv-1 Virions.
From: Viral Mutation Section, HIV Drug Resistance Program, Center for Cancer Research, National Cancer Institute-Frederick, P. O. Box B, Bldg. 535, Rm. 334, Frederick, MD 21702, USA.
Virology
- Publish Date: Apr 2007
- ISSN: 0042-6822
- Volume: 360
- Issue: 2
- Pages: 247-56
- Medium: Print
- Language: English
- Citation (JAMA): Xu Hongzhan, Chertova Elena, Chen Jianbo, et al. Stoichiometry of the Antiviral Protein Apobec3g in Hiv-1 Virions.. Virology Apr 2007;360:247-56
Abstract
A host cytidine deaminase, APOBEC3G (A3G), inhibits replication of human immunodeficiency virus type 1 (HIV-1) by incorporating into virions in the absence of the virally encoded Vif protein (Deltavif virions), at least in part by causing G-to-A hypermutation. To gain insight into the antiretroviral function of A3G, we determined the quantities of A3G molecules that are incorporated in Deltavif virions. We combined three experimental approaches-reversed-phase high-pressure liquid chromatography (HPLC), scintillation proximity assay (SPA), and quantitative immunoblotting-to determine the molar ratio of A3G to HIV-1 capsid protein in Deltavif virions. Our studies revealed that the amount of the A3G incorporated into Deltavif virions was proportional to the level of its expression in the viral producing cells, and the ratio of the A3G to Gag in the Deltavif virions produced from activated human peripheral blood mononuclear cells (PBMC) was approximately 1:439. Based on previous estimates of the stoichiometry of HIV-1 Gag in virions (1400-5000), we conclude that approximately 7 (+/-4) molecules of A3G are incorporated into Deltavif virions produced from human PBMCs. These results indicate that virion incorporation of only a few molecules of A3G is sufficient to inhibit HIV-1 replication.
Mesh Headings (Keywords): Cells, Cultured, Chromatography, High Pressure Liquid, Cytidine Deaminase, Gene Deletion, Gene Products, gag, Gene Products, vif, HIV-1, Humans, Immunoblotting, Leukocytes, Mononuclear, Nucleoside Deaminases, Repressor Proteins, Scintillation Counting, Virion, Virus Replication, vif Gene Products, Human Immunodeficiency Virus
Check for Full Text / PubMed Unique Identifier (PMID): 17126871
This abstract is part of PubMed, a service of the U.S. National Library of Medicine. PubMed includes more than 17 million citations from MEDLINE and other life science journals for biomedical articles. See Copyright and Disclaimers.
Linked medical terms appearing on this page are added by Healia to help readers find more information and are not part of the original PubMed document.
The data herein was last updated on July 8th, 2008 and may not reflect the most current and accurate data available from NLM.