title: [A lentivirus vector based assay system for quantitative detection of intracellular translocations of recombinant proteins].
abstract: An enzymatic assay system is described that allows quantitative localization within different cellular structures of recombinant proteins. The system is based on alpha-complementation of beta-galactosidase. The large omega-fragment of beta-galactosidase is expressed in predefined cellular structures with the aid of attached protein localization signals. The obtained reporter cell lines are used for the introduction of a second construct that expresses a protein of study fused with a shorter alpha-fragment of beta-galactosidase. Physical proximity of the two recombinant proteins carrying beta-galactosidase fragments results in reconstitution of an active enzyme, and the activity can be measured in a plate reader. The recombinant constructs are based on lentiviral vectors, which allows rapid and efficient introduction of recombinant proteins into cells by infection with stocks of lentiviral particles. The efficiency of the system is demonstrated with transcriptional factor FOXO3A, which is shuttling between cytoplasm and nuclei in model colon carcinoma cell line RKO.
authors.forename: S P
authors.initials: SP
authors.lastname: Chumakov
authors.forename: G V
authors.initials: GV
authors.lastname: Il'inskaia
authors.forename: Iu E
authors.initials: IuE
authors.lastname: Kravchenko
authors.forename: E I
authors.initials: EI
authors.lastname: Frolova
authors.forename: V S
authors.initials: VS
authors.lastname: Prasolov
authors.forename: P M
authors.initials: PM
authors.lastname: Chumakov
mesh_terms: D021581:Active Transport, Cell Nucleus / Q000502:physiology; D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000235:genetics / Q000378:metabolism*; D003593:Cytoplasm / Q000235:genetics / Q000378:metabolism*; D000071316:Forkhead Box Protein O3; D051858:Forkhead Transcription Factors / Q000235:genetics / Q000378:metabolism*; D005822:Genetic Vectors; D006801:Humans; D016086:Lentivirus; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: C499517:FOXO3 protein, human; D000071316:Forkhead Box Protein O3; D051858:Forkhead Transcription Factors; D011994:Recombinant Proteins