title: A colorimetric reverse transcriptase assay optimized for Moloney murine leukemia virus, and its use for characterization of reverse transcriptases of unknown identity.
abstract: A non-radioactive reverse transcriptase (RT) assay, reported as useful for lentivirus RTs, was optimized for the measurement of Moloney murine leukemia virus (MMuLV) RT. The optimized assay could detect 0.3 microU of MMuLV RT. The specificities of the MMuLV and lenti RT assays were demonstrated using the RTs of human immunodeficiency virus type 1, simian immunodeficiency virus, feline immunodeficiency virus (FIV), visna virus, human T-cell lymphotropic virus type 1, MMuLV and feline leukemia virus (FeLV). An RT activity blocking antibody (RTb-ab) assay was standardized for Mn2+ dependent MuLV-related RTs. The assay was used to demonstrate the distinct antigenic properties of RTs from mammalian MuLV-related retroviruses and lentiviruses. Cross-reactivity between MMuLV RTb-ab and FeLV RT but not between MMuLV RTb-ab and e.g. FIV RT was demonstrated. An RT activity found in the murine myeloma cell line SP2/0 was found to have similar assay preferences as MMuLV RT, and the MMuLV-RT hyperimmune sera reacted strongly against this RT, indicating the RT to be of MuLV-related etiology. The use of the RT and RTb-ab assays for detection and characterization of RTs of known or unknown identity is discussed.
authors.affiliation: Department of Genetics and Pathology, Uppsala University, BMC, Sweden. anders.malmsten@bmc.uu.se
authors.forename: A
authors.initials: A
authors.lastname: Malmsten
authors.forename: D H
authors.initials: DH
authors.lastname: Ekstrand
authors.forename: L
authors.initials: L
authors.lastname: Akerblom
authors.forename: J S
authors.initials: JS
authors.lastname: Gronowitz
authors.forename: C F
authors.initials: CF
authors.lastname: Källander
authors.forename: M
authors.initials: M
authors.lastname: Bendinelli
authors.forename: D
authors.initials: D
authors.lastname: Matteucci
mesh_terms: D016475:3T3 Cells; D000818:Animals; D002415:Cats; D002460:Cell Line; D002522:Chlorocebus aethiops; D003124:Colorimetry / Q000379:methods*; D006224:Cricetinae; D006801:Humans; D007527:Isoenzymes; D016086:Lentivirus / Q000201:enzymology; D051379:Mice; D008979:Moloney murine leukemia virus / Q000201:enzymology* / Q000302:isolation & purification; D012194:RNA-Directed DNA Polymerase / Q000032:analysis*; D012680:Sensitivity and Specificity; D014407:Tumor Cells, Cultured; D014709:Vero Cells
chemical_list: D007527:Isoenzymes; D012194:RNA-Directed DNA Polymerase