Identification and characterization of human immunodeficiency virus type 1 gag-pol fusion protein in transfected mammalian cells.
AUTOR(ES)
Peng, C
RESUMO
Three human immunodeficiency virus type 1 (HIV-1) mutants were constructed with mutations in their protease genes: AH2-pSVL, with an in-phase deletion; BH27-pSVL, with an out-of-phase deletion creating a stop codon immediately after the deletion site; and CA-pSVL, with a point mutation creating an Asp-to-Ala substitution at the putative protease active site. The wild-type, HXB2-pSVL, and the mutated viral genomes were used to transfect COS-M6 cells and to produce virions. Immunoblotting assays with a monoclonal antibody (MAb) specific for p24 showed that all three mutant contained a gag precursor, Pr56gag, with AH2 and CA expressing an extra band of about 160 kDa. Similar assays with a MAb specific for HIV-1 reverse transcriptase (RT) also revealed a 160-kDa protein from AH2 and CA virions and two mature p66 and p51 RT subunits from HXB2 virions. In addition, HXB2, AH2, and CA but not BH27 virions exhibited RT activity. The same protein in the 160-kDa band seemed to possess both p24 and RT components, since the MAb against p24 was able to immunoadsorb RT antigen and enzymatic activity. These results indicate that the HIV-1 gag-pol fusion protein produced in mammalian cells expressed significant RT activity.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=240643Documentos Relacionados
- Functional Human Immunodeficiency Virus Type 1 (HIV-1) Gag-Pol or HIV-1 Gag-Pol and Env Expressed from a Single Rhabdovirus-Based Vaccine Vector Genome
- Translational frameshifting at the gag-pol junction of human immunodeficiency virus type 1 is not increased in infected T-lymphoid cells.
- Mutational analysis of the gag-pol junction of Moloney murine leukemia virus: requirements for expression of the gag-pol fusion protein.
- Incorporation of Pol into Human Immunodeficiency Virus Type 1 Gag Virus-Like Particles Occurs Independently of the Upstream Gag Domain in Gag-Pol
- Purification and structural characterization of the putative gag-pol protease of human immunodeficiency virus.