Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:2.7.7.49 (reverse transcriptase)
 31,746 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

9-O-methyloximd erythromycin A and its analogue inhibited reverse transcriptase and blocked focus formation of Rous sarcoma virus. These chemicals inhibited neither DNA-dependent DNA polymerase nor DNA-dependent RNA polymerase from bacterial sources. However, they inhibited reverse transcriptase with an apparently differnt mechanism than that by rifamycin ABDP.
J Gen Virol 1975 Jan
PMID:Oxime derivatives of erythromycin: inhibitors of Rous sarcoma virus reverse transcriptase activity and focus formation. 4 82

The simultaneous detection test gave no evidence for the presence of RNA tumour viruses in herpesvirus induced malignant lymphomas of non-human primates. The 12 tumours tested were obtained from three different monkey species inoculated with Herpesvirus saimiri or herpesvirus ateles. Particles encapsulating RNA-instructed DNA polymerase and high mol. wt. virus-related RNA were easily demonstrated in tumours of the mouse induced by type-C or type-B oncornaviruses and in human lymphoid cells infected with simian sarcoma virus type I which were examined in parallel. Attempts to demonstrate partial expression of an oncornavirus genome in the herpesvirus induced tumours and attempts to detect an interspecies antigen related to monkey oncornaviruses were negative and strengthened the observations made with the simultaneous detection test.
J Gen Virol 1975 May
PMID:No evidence for particles encapsulating RNA-instructed DNA polymerase and high molecular weight virus-related RNA in herpesvirus induced tumours of non-human primates. 4 97

A virus designated bovine leukaemia virus (BLV), associated with leukaemia in cattle and previously demonstrated to induce the disease in sheep, was purified from chronically infected sheep cell cultures. Electrophoretic analysis showed a major protein of mol. wt. about 24,000 (p24) which reacted in gel diffusion and complement-fixation tests with sera from naturally infected cattle, experimentally infected sheep, and guinea pigs immunized with p24. BLV p24 has an isoelectric point of 8-6. Interspecies antigenic reactivities characteristic of mammalian Type C virus p30s were not detected in disrupted BLV or on p24. Sheep and guinea pig antisera to BLV, reactive with p24, also did not precipitate several Type C virus p30s in radioimmunoassays. BLV is also distinguished from Type C viruses and resembles mouse mammary tumour virus and Mason-Pfezer virus in having an RNA-dependent DNA polymerase which is preferentially active in the presence of Mg++ when synthetic templates are used. Along with previously published morphological data, the above indicates that BLV is not a Type C virus as classically defined. Four hundred and forty one human sera from cancer patients and matched controls were non-reactive with disruped BLV, BLV infected cells, and BLV p24 in complement-fixation tests.
J Gen Virol 1975 Dec
PMID:Characteristics of the major internal protein and RNA-dependent DNA polymerase of bovine leukaemia virus. 5 5

The effect of interferon on the replication of vesicular stomatitis virus (VSV) and type-C oncornavirus in two Balb/c mouse cell lines, JLS-V5 and JLS-V9R, infected with MuLV-R was examined. VSV replication was inhibited threefold (0-5 log10) in both cell lines by 10 to 20 units of interferon/ml. In JLS-V5 cells C-type virus yields, as measured by 3H-uridine incorporation and reverse transcriptase activity, were also reduced threefold by 10 to 20 units of interferon/ml. However, in JLS-V9R cells, C-type virus replication was refractory to interferon at concentrations up to 1 x 10(4) units/ml. Infectious C-type virus transmitted from JLS-V9R cells to Balb/3TS cells was as sensitive to interferon as virus transmitted from JLS-V5 cells, indicating that resistance of C-type virus in JLS-V9R cells is a feature of the cells rather than of the virus strain.
J Gen Virol 1976 Jun
PMID:Differential sensitivity of Rauscher murine leukaemia virus (MuLV-R) to interferons in two interferon-responsive cell lines. 5 65

Controlled disruption of 60S AMV RNA with formamide was used to prepare 50-55S and 30-40S RNAS. When the activities of these RNAs as templates for AMV reverse transcriptase were compared it was found that 50-55S RNA was 1-5 times and 30-40S RNA 2 to 3 times more active than 60S RNA. The 30-40S RNA produced by heating, instead of formamide disruption, was inactive as a template but activity was restored by addition of oligo(dT). 40% of the 4S RNA initially associated with the 60S RNA remained associated with all the RNA species obtained by formamide treatment but was lost on heating. It is concluded that this RNA acts as resident primer whereas the other 60% of the 4S RNA is less firmly bound and appears to have little or no primer activity. Removal of the less firmly bound 4S RNA increases the template activity of the viral RNA.
J Gen Virol 1976 Feb
PMID:Stepwise dissociation of high molecular weight avian myeloblastosis virus RNA: 30-40S RNA subunits--the best natural template-primer for viral reverse transcriptase. 5 91

Three methods of pelleting, pelleting followed by Pronase treatment, polyethylene glycol (PEG)-Pronase, and diaflo ultrafiltration (diafiltration) were used to concentrate RSV(RAV-1) from tissue culture fluids. Sucrose-gradient fractions containing virus preparations which had been concentrated by diafiltration or pelleting were heavily contaminated with amorphous debris. This debris was not present in similar, gradient-purified preparations that had been concentrated by the PEG-Pronase or pellet-Pronase methods. Maximum recovery of radiolabelled virus particles and virion-associated RNA-dependent DNA polymerase activity was obtained in gradient fractions containing virus concentrates prepared by the pellet-Pronase and PEG-Pronase methods. Although there were slight differences in recovery by these two methods, the advantages of the PEG-Pronase method make it the preferred method, especially when large volumes of tissue culture fluids are used.
J Gen Virol 1976 Dec
PMID:A comparison of four methods used to concentrate Rous sarcoma virus from tissue culture fluids. 6 39

C-type particles secreted in vivo by MOPC-315 myeloma cells were characterized. These particles localize at a density of 1-16 g/ml in sucrose and possess a 60 to 70S RNA and an RNA-instructed DNA polymerase. Endogenous enzyme activity requires manganese and is inhibited by ribonuclease or by the omission of any of the deoxynucleoside triphosphates. The enzyme utilizes the virus 60 to 70S RNA as a template to synthesize DNA molecules which specifically hybridize to the homologous RNA.
J Gen Virol 1976 Aug
PMID:RNA-instructed DNA polymerase associated with C-type particles produced in vivo by murine myeloma cells. 6 43

The spontaneous expression of a type C virus in a diploid strain of human embryonic lung fibroblast-like cells (HEL-12) was examined during serial culture. Virus antigen expression was determined by indirect immunofluorescenc with antisera to disrupted simian sarcoma virus and the 28000 mol. wt. internal antigen of the endogenous cat virus RD-114. Virus production was examined by reverse transcriptase assays of culture fluids. Virus antigens were not detected for 25 days after frozen, primary HEL-12 cells were reinstated in culture. The cells expressed virus antigens but did not release virus particles between 25 and 80 days. Spontaneous virus release and maximal antigen expression occurred in cells grown for 80 to 120 days. Virus particles were not detected after 120 days although virus antigens persisted until the experiment was terminated. The HEL-12 virus was infectious for cell cultures of human, rhesus monkey, dog and rabbit cells. The proportion of SiSV-like and RD-114-like antigenic components of HEL-12 virus were altered by passage through heterologous cells suggesting heterogeneity of the HEL-12 virus population.
J Gen Virol 1977 Jun
PMID:Cell generation and type C virus expression in the human embryonic cell strain HEL-12. 6 77

The reverse transcriptase of Mason-Pfizer monkey virus (M-PMV) has been isolated and partially purified by ion exchange chromatography. Sera from rabbits immunized with the partially purified enzyme have been shown by microimmunodiffusion analysis to be immunologically specific for the M-PMV polymerase. The immune serum also specifically inhibits M-PMV polymerase activity and this inhibitory activity has been shown to reside in the IgG fraction of the serum. The application of these reagents to examining virus identity and investigating the possible viral aetiology of human breast cancer is discussed.
J Gen Virol 1977 Aug
PMID:Production of antiserum to the reverse transcriptase of Mason-Pfizer monkey virus. 7 May 6

Ouabain markedly inhibited the growth of the mouse cell lines K3b and JLS-V9 and the production of murine leukaemia virus (MuLV) in them. The inhibition of MuLV production was abolished by exposing the cells to normal medium or by adding a high concentration (43 mM) of K+ ions to the ouabain-containing medium. MuLV production was reduced by ouabain more rapidly than host cell directed protein synthesis. After treatment of cells with ouabain (0.5 mM) for 7 h, extracellular reverse transcriptase reverse transcriptase activities were reduced by 87 to 92%. However, the intracellular level of polymerase activities remained almost unchanged (77 to 98% relative to the control). Mouse interferon inhibited the production of MuLV in K3b cells and this antiviral action was not blocked by 0.5 mM-ouabain.
J Gen Virol 1978 Feb
PMID:Suppression of murine leukaemia virus production by ouabain and interferon in mouse cells. 7 44


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