title: In vivo biotinylation and capture of HIV-1 matrix and integrase proteins.
abstract: This report describes the adaptation of the biotin ligase BirA-biotin acceptor sequence (BAS) labeling system to biotinylate specific human immunodeficiency virus 1 (HIV-1) proteins in vivo. Two HIV-1 clones were constructed, with the BAS introduced into the matrix region of gag or the integrase region of pol. Specific biotinylation of target proteins in virions was observed when molecular clones were co-expressed with BirA. Both BAS-containing viruses propagated in SupT1 T-cells although replication of the integrase clone was delayed. Further studies demonstrated that the integrase insertion yielded an approximate 40% reduction in single-round infectivity as assessed on MAGI-5 indicator cells, as well as in the in vitro integration activity of preintegration complexes extracted from acutely infected C8166-45 T-cells. Biotinylation of the integrase BAS tag furthermore rendered this virus non-infectious. The matrix viral clone by contrast displayed wild-type behavior under all conditions tested. These results therefore establish a system whereby biotinylated matrix protein in the context of replication-competent virus could be used to label and capture viral protein complexes in vivo.
authors.affiliation: Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE 68178, United States. michaelbelshan@creighton.edu
authors.forename: Michael
authors.initials: M
authors.lastname: Belshan
authors.forename: Cameron J
authors.initials: CJ
authors.lastname: Schweitzer
authors.forename: Meghan R
authors.initials: MR
authors.lastname: Donnellan
authors.forename: Richard
authors.initials: R
authors.lastname: Lu
authors.forename: Alan
authors.initials: A
authors.lastname: Engelman
mesh_terms: D000595:Amino Acid Sequence; D001665:Binding Sites; D019921:Biotinylation; D019731:Carbon-Nitrogen Ligases / Q000235:genetics / Q000378:metabolism; D002460:Cell Line; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism; D015488:HIV Antigens / Q000302:isolation & purification* / Q000378:metabolism*; D019427:HIV Integrase / Q000302:isolation & purification* / Q000378:metabolism*; D015497:HIV-1 / Q000254:growth & development*; D006801:Humans; D008969:Molecular Sequence Data; D012097:Repressor Proteins / Q000235:genetics / Q000378:metabolism; D013194:Staining and Labeling / Q000379:methods; D013601:T-Lymphocytes / Q000821:virology; D054301:gag Gene Products, Human Immunodeficiency Virus / Q000302:isolation & purification* / Q000378:metabolism*
chemical_list: D029968:Escherichia coli Proteins; D015488:HIV Antigens; D012097:Repressor Proteins; D054301:gag Gene Products, Human Immunodeficiency Virus; C054858:p17 protein, Human Immunodeficiency Virus Type 1; D019427:HIV Integrase; D019731:Carbon-Nitrogen Ligases; C058125:birA protein, E coli; C514801:p31 integrase protein, Human immunodeficiency virus 1