526
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Sen A, Prasad RDG, Reddy SP. Quadrupolar double transitions S1(J)+S0(J) in the infrared fundamental band of molecular hydrogen at 77 K. J Chem Phys 1980. [DOI: 10.1063/1.439283] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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527
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528
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Sen A, Sen Gupta KP. Effect of feeding common edible oils to rats on the lipid profile of heart tissue. INDIAN JOURNAL OF EXPERIMENTAL BIOLOGY 1979; 17:1277-9. [PMID: 549849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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529
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Ghose D, Sen A, Das Gupta NN, Guha A. Electron microscopy of colicinogenic plasmid E1 (Col E1) DNA. INDIAN JOURNAL OF BIOCHEMISTRY & BIOPHYSICS 1979; 16:240-5. [PMID: 395104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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530
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Sen A, Todaro GJ, Blair DG, Robey WG. Thermolabile protein kinase molecules in a temperature-sensitive murine sarcoma virus pseudotype. Proc Natl Acad Sci U S A 1979; 76:3617-21. [PMID: 226971 PMCID: PMC383883 DOI: 10.1073/pnas.76.8.3617] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Murine sarcoma virus-associated protein kinases that bind to actin have been purified by affinity chromatography on actin coupled to Sepharose. Heat inactivation studies showed the presence of thermolabile enzyme activity in pseudotypes containing a temperature-sensitivity mutant of murine sarcoma virus (MSV) but not in two independent wild-type MSV pseudotypes. Studies with Sephadex G-75 column fractions showed that a low molecular weight form, approximately 15,000, is the major thermolabile kinase in the temperature-sensitive MSV virions. Antibodies raised against the MSV-coded p60 protein, when added to the in vitro reaction mixtures, showed specific phosphorylation of the IgG heavy chain and a simultaneous reduction in the extent of phosvitin phosphorylation catalyzed by the various MSV pseudotype kinases. Thus a transforming retrovirus-coded enzyme activity that interacts directly with a major cytoskeletal protein and whose activity parallels the transforming ability of a conditional MSV mutant has now been identified.
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531
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Sen A, Todaro GJ. A murine sarcoma virus-associated protein kinase: interaction with actin and microtubular protein. Cell 1979; 17:347-56. [PMID: 222479 DOI: 10.1016/0092-8674(79)90161-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A low molecular weight (LMW) protein phosphokinase enzyme that binds to actin has been isolated from murine sarcoma virions; this kinase activity is not present in nontransforming murine leukemia viruses. Sephadex G-75 gel filtration and affinity chromatography on actin-Sepharose conjugates allow a significant level of purification of this enzyme. The enzyme associates with microtubular proteins and inhibits the in vitro polymerization of microtubules. This study represents the first isolation of a sarcoma virus-associated protein that possesses the ability to interact directly with two major components of the cytoskeletal system.
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532
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Shaikh R, Linial M, Brown S, Sen A, Eisenman R. Recombinant avian oncoviruses. II. Alterations in the gag proteins and evidence for intragenic recombination. Virology 1979; 92:463-81. [PMID: 218355 DOI: 10.1016/0042-6822(79)90150-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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533
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Sen A, Halverson DO, Rapp UR, Todaro GJ. Sarcoma virus-specific phosphoproteins are packaged in "rescued" type C virions. Virology 1979; 92:245-51. [PMID: 217164 DOI: 10.1016/0042-6822(79)90231-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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534
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Kundu SC, Sen A. Prazosin in refractory hypertension. Indian Heart J 1979; 31:8-12. [PMID: 437820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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535
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536
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Shoyab M, Sen A. A rapid method for the purification of extrachromosomal DNA from eukaryotic cells. J Biol Chem 1978; 253:6654-6. [PMID: 211127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
A simple and efficient procedure to purify the low molecular weight extrachromosomal DNA from eukaryotic cells is described. Gentle lysis of cells with urea and sodium dodecyl sulfate in 0.24 M phosphate buffer (pH 6.8) is followed by the removal of high molecular weight bulk DNA by centrifugation. Protein and RNA are removed from the supernatant by hydroxyapatite chromatography in urea/phosphate buffer. Urea is then removed with 0.15 M phosphate buffer and the extrachromosomal DNA, virtually free from protein and RNA, is finally eluted in 0.5 M phosphate buffer. The procedure allows the recovery of about 99% simian virus 40 (SV40) DNA from infected monkey kidney cells in the extrachromosomal fraction. In normal mouse, monkey, andhuman cells, approximately 1% of total cell DNA appears to be extrachromosomal.
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537
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Bryant ML, Sherr CJ, Sen A, Todaro GJ. Molecular diversity among five different endogenous primate retroviruses. J Virol 1978; 28:300-13. [PMID: 81317 PMCID: PMC354269 DOI: 10.1128/jvi.28.1.300-313.1978] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Genetically transmitted retroviruses of Old and New World monkeys include type C viruses isolated from baboons (M7), macaque (MAC-1), and owl monkeys (OMC-1) and type D viruses from langurs (PO-1-Lu) and squirrel monkeys (SMRV, M534). Each of these isolates is unrelated to the others by nucleic acid hybridization criteria and contains a unique array of virion-associated proteins which can be resolved by agarose gel filtration and polyacrylamide gel electrophoresis under denaturing conditions. The major structural protein of each virus has a distinct primary structure, as determined by two-dimensional tryptic peptide analysis, and is antigenically different from the others. The major virion phosphoproteins of endogenous primate type C viruses (pp15) are also different from those of type D viruses (pp13-pp14). Immunological and structural analyses show that the endogenous langur virus and the horizontally transmitted Mason-Pfizer virus of rhesus monkeys are closely related to one another, consistent with the sequence homology detected in their RNA genomes. Although certain radioimmunoassays detect interspecies antigenic determinants common to either the p30 or gp70 proteins of some of these viruses, no one assay has yet been designed which can detect all groups of endogenous primate retroviridae. The data lead to the conclusion that primates contain a minimum of three different sets of genetically transmitted type C and type D retroviral genes.
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538
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Shoyab M, Sen A. A rapid method for the purification of extrachromosomal DNA from eukaryotic cells. J Biol Chem 1978. [DOI: 10.1016/s0021-9258(17)37965-6] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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539
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Chakraborty D, Bhattacharyya A, Majumdar K, Chatterjee K, Chatterjee S, Sen A, Chatterjee GC. Studies on L-ascorbic acid metabolism in rats under chronic toxicity due to organophosphorus insecticides: effects of supplementation of L-ascorbic acid in high doses. J Nutr 1978; 108:973-80. [PMID: 650299 DOI: 10.1093/jn/108.6.973] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
The effects of chronic administration of two organophosphorus insecticides, parathion and malathion on the growth rate, ascorbic acid metabolism and some other nutritional and physiological parameters in rats were studied. Both parathion and malathion toxicity retarded the growth rate of rats. Inhibition of brain acetylcholinesterase was taken as an index of organophosphorus insecticide toxicity. Haemoglobin concentration of blood and organ weights were not affected under the toxic conditions. Parathion and malathion administration stimulated the activity of L-gulonolactone oxidase along with a simultaneous increase in the tissue storage and urinary excretion of vitamin C. The activities of other enzymes of ascorbic acid metabolism, dehydroascorbatase, uronolactonase, and L-gulonate dehydrogenase and decarboxylase were altered under the experimental conditions. Only minor histological changes of the liver and kidney tissues were noted under parathion and malathion toxicities. Excess intake of vitamin C under the toxic conditions was found to be very effective in counteracting the growth retardation and also the alterations produced by parathion and malathion both at the enzymatic and histological levels.
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540
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Sherwin SA, Rapp UR, Benveniste RE, Sen A, Todaro GJ. Rescue of endogenous 30S retroviral sequences from mouse cells by baboon type C virus. J Virol 1978; 26:257-64. [PMID: 207887 PMCID: PMC354063 DOI: 10.1128/jvi.26.2.257-264.1978] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mus musculus SC-1 cells were infected with M7 baboon type C virus. The progeny of this infection included viral pseudotypes that contained M7 helper virus and endogenous 30S retrovirus-associated sequences derived from SC-1 cells (RAS). The RAS sequences are unrelated by nucleic acid hybridization criteria to previously described types of murine retroviruses and do not code for known murine viral structural proteins. The RAS genome is present in multiple copies in the DNA of laboratory (M. musculus) and Asian (M. caroli and M. cervicolor) mice, is expressed in the RNA of uninfected mouse cells, and can be efficiently rescued by type C, but not type B, viruses. RAS is closely related to 30S virus-associated RNA in NIH/3T3 and BALB/c JLSV-9 cells and may be analogous to the defective 30S RNA sequences found in rats.
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541
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Sen A, Todaro GJ. Species-specific cellular DNA-binding proteins expressed in mouse cells transformed by chemical carcinogens. Proc Natl Acad Sci U S A 1978; 75:1647-51. [PMID: 205864 PMCID: PMC392395 DOI: 10.1073/pnas.75.4.1647] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mouse cells transformed by DNA and RNA tumor viruses and by chemical carcinogens have been examined for the presence of specific DNA-binding proteins by DNA-cellulose chromatography. Using mouse DNA-cellulose we have obtained single-stranded DNA-binding proteins from two clones transformed by chemical carcinogens. Simian virus 40 transformants also have a DNA-binding protein [the tumor (T) antigen] that binds to mouse and human DNA with comparable affinity. Mouse sarcoma virus-transformed cells and two other chemically transformed clones showed no difference in DNA-binding protein pattern compared to the untransformed parental cell. The DNA-binding proteins isolated from the chemically transformed cell clones are between 25,000 and 30,000 daltons by sodium dodecyl sulfate/polyacrylamide gel electrophoresis. These cellular "T proteins" bind to the homologous mouse cellular DNA with a higher affinity than to heterologous human cellular DNA.
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542
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Sherr CJ, Sen A, Todaro GJ, Sliski A, Essex M. Pseudotypes of feline sarcoma virus contain an 85,000-dalton protein with feline oncornavirus-associated cell membrane antigen (FOCMA) activity. Proc Natl Acad Sci U S A 1978; 75:1505-9. [PMID: 206902 PMCID: PMC411501 DOI: 10.1073/pnas.75.3.1505] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Feline sarcoma virus (FeSV) rescued from transformed nonproducer mink or rat cells contains two FeSV-specific antigens (p15 and p12), and the feline oncornavirus-associated cell membrane antigen (FOCMA). All three antigens are helper virus-independent and are encoded by the FeSV genome, FOCMA, p15, and p12 antigens cochromatograph as phosphorylated molecules of 85,000 molecular weight (pp85), adsorb to immunoadsorbant columns prepared with antibodies to feline leukemia virus (FeLV), and are precipitated with antisera to FeLV or FOCMA. Antibodies to FOCMA can be adsorbed with fractions containing pp85 but not with FeLV proteins, including p15 and p12. Thus, a virus-coded tumor antigen which immunizes cats against tumors induced by feline type C viruses is packaged in FeSV particles and is linked to viral structural protein.
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543
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Todaro GJ, Sherr CJ, Sen A, King N, Daniel MD, Fleckenstein B. Endogenous New World primate type C viruses isolated from owl monkey (Aotus trivirgatus) kidney cell line. Proc Natl Acad Sci U S A 1978; 75:1004-8. [PMID: 76312 PMCID: PMC411388 DOI: 10.1073/pnas.75.2.1004] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A type C virus (OMC-1) detected in a culture of owl monkey kidney cells resembled typical type C viruses morphologically, but was slightly larger than previously characterized mammalian type C viruses. OMC-1 can be transmitted to bat lung cells and cat embryo fibroblasts. The virions band at a density of 1.16 g/ml in isopycnic sucrose density gradients and contain reverse transcriptase and a 60-65S RNA genome composed of approximately 32S subunits. The reverse transcriptase is immunologically and biochemically distinct from the polymerases of othe retroviruses. Radioimmunoassays directed to the interspecies antigenic determinants of the major structure proteins of other type C viruses do not detect a related antigen in OMC-1. Nucleic acid hybridization experiments using labeled viral genomic RNA or proviral cDNA transcripts to normal cellular DNA of different species show that OMC-1 is an endogenous virus with multiple virogene copies (20-50 per haploid genome) present in normal owl monkey cells and is distinct from previously isolated type C and D viruses. Sequences related to the OMC-1 genome can be detected in other New World monkeys. Thus, similar to the Old World primates (e.g., baboons as a prototype), the New World monkeys contain endogenous type C viral genes that appear to have been transmitted in the primate germ line.
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544
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Sen A, Sherr CJ, Todaro GJ. Endogenous feline (RD-114) and baboon type C viruses have related specific RNA-binding proteins and genome binding sites. Virology 1978; 84:99-107. [PMID: 202083 DOI: 10.1016/0042-6822(78)90221-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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545
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Jauhri KS, Kumari ML, Sen A. Production of protein by fungi from agricultural wastes. I. Standardization of certain factors for maximum protein production. ZENTRALBLATT FUR BAKTERIOLOGIE, PARASITENKUNDE, INFEKTIONSKRANKHEITEN UND HYGIENE. ZWEITE NATURWISSENSCHAFTLICHE ABTEILUNG: MIKROBIOLOGIE DER LANDWIRTSCHAFT DER TECHNOLOGIE UND DES UMWELTSCHUTZES 1978; 133:588-96. [PMID: 34947 DOI: 10.1016/s0323-6056(78)80058-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Several fungi were screened for protein production in a simple medium using either sugarcane bagasse, wheat straw or cowdung as substrate. Out of them Rhizoctonia melongina, Pleurotus ostreatus, and Coprinus aratus proved promising and were taken up for further studies. Optimum conditions of temperature, incubation, and pH for maximum growth and protein production by the three fungi were then ascertained and standardized.
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546
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Jollès J, Sen A, Prager EM, Jollès P. Structural data concerning reptilian (tortoise) egg lysozyme. J Mol Evol 1977; 10:261-4. [PMID: 599576 DOI: 10.1007/bf01764601] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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547
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Sen A, Larson D, Todaro GJ. Binding sites for type C viral phosphoprotein on the viral RNA genome. Biochem Biophys Res Commun 1977; 79:518-24. [PMID: 588284 DOI: 10.1016/0006-291x(77)90188-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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548
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Kundu SC, Majumdar S, Sen A, Roy A, Bhattacherjee TD. Oesophageal electrocardiograph in true posterior myocardial infarction. Indian Heart J 1977; 29:320-4. [PMID: 612522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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549
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Gayen SK, Som S, Sinha NK, Sen A. Lysozyme in egg whites of tortoises and turtle. Purification and properties of egg white lysozyme of Trionyx gangeticus Cuvier. Arch Biochem Biophys 1977; 183:432-42. [PMID: 21616 DOI: 10.1016/0003-9861(77)90378-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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550
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Kumar V, Damle V, Rao BS, Sen A, Kumar L. Gaps in the understanding of parents about preventive aspects of diseases and promotional aspects of health hospitalised children. Indian Pediatr 1977; 14:433-8. [PMID: 604270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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