551
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Sen A, Sherr CJ, Todaro GJ. Phosphorylation of murine type C viral p12 proteins regulates their extent of binding to the homologous viral RNA. Cell 1977; 10:489-96. [PMID: 844104 DOI: 10.1016/0092-8674(77)90036-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The purified p12 phosphoprotein of Rauscher murine leukemia virus was fractionated by ion exchange chromatography into subpopulations of molecules containing different amounts of covalently linked phosphate. Of the various phosphorylated forms of p12 protein purified from virions, only a species containing relatively little phosphate can bind in vitro to purified homologous 70S viral RNA. Using ultraviolet irradiation to stabilize ribonucleoprotein complexes in intact virions, the same molecular species of p12 phosphoprotein can be isolated in close association with the 70S viral genome. The results show that phosphorylation of type C viral p12 proteins influences the extent, but not the specificity, of their interaction with homologous viral RNA.
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552
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Balasundaram VR, Sen A. Stepwise selection of efficient rhizobial cultures through cultural characteristics. ZENTRALBLATT FUR BAKTERIOLOGIE, PARASITENKUNDE, INFEKTIONSKRANKHEITEN UND HYGIENE. ZWEITE NATURWISSENSCHAFTLICHE ABT.: ALLGEMEINE, LANDWIRTSCHAFTLICHE UND TECHNISCHE MIKROBIOLOGIE 1977; 132:623-7. [PMID: 565117 DOI: 10.1016/s0044-4057(77)80043-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Nodulation and shoot nitrogen of two varieties of soybean (Glycine max) were studied with twenty strains of Rhizobium japonicum. A number of cultural characteristics of the strains in isolation to the symbiotic system were also studied. A stepwise selection method was employed for detecting efficient cultures through the cultural characteristics which showed association with the steps in the symbiotic system. Nodulation of one variety was found to be associated with the dehydrogenase activity and the growth of microbes in the medium containing soil extract, whereas the nodulation of another variety showed association with the growth in the media containing asparagine and tryptophane. The shoot nitrogen of one nodulated cultivar correlated with the microbial growth in Elkan's medium in the medium containing serine and glucose, whereas the shoot nitrogen of the other nodulating variety correlated with the growth of the cultures in the medium containing aspartic acid. The validity of this approach to the problem for detecting efficient strains through cultural characteristics was discussed.
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553
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Sen A, Todaro GJ. The genome-associated, specific RNA binding proteins of avian and mammalian type C viruses. Cell 1977; 10:91-9. [PMID: 189935 DOI: 10.1016/0092-8674(77)90143-x] [Citation(s) in RCA: 91] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A structural protein purified from the Rous sarcoma virus (RSV) can specificially bind in vitro to purified avian, but not mammalian, type C viral RNA. Following ultraviolet irradiation of viral particles under conditions which stabilize the polyploid 70S viral RNA, the same polypeptide can be directly purified from the RSV genome. Based on its electrophoretic mobility in polyacrylamide gels containing sodium dodecylsulfate, the RNA binding protein has been identified as the major phosphoprotein (p19) of avian type C viruses. Similar experiments show that the major phosphoproteins of mammalian type C viruses (p12 for murine viruses and p16 for endogenous primate viruses) are also the specific RNA binding proteins and, similarly, are found closely associated with the 70S RNA genomes in the intact viral particles.
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554
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Balasundaram VR, Sen A. Grouping of rhizobial strains--a method based on symbiotic characteristics. ZENTRALBLATT FUR BAKTERIOLOGIE, PARASITENKUNDE, INFEKTIONSKRANKHEITEN UND HYGIENE. ZWEITE NATURWISSENSCHAFTLICHE ABT.: ALLGEMEINE, LANDWIRTSCHAFTLICHE UND TECHNISCHE MIKROBIOLOGIE 1977; 132:616-22. [PMID: 565116 DOI: 10.1016/s0044-4057(77)80042-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Twenty strains of Rhizobium japonicum and non-inoculated control were used to study seven symbiotic characteristics with two varieties of soybean (Glycine max). The strains were then grouped on the basis of these symbiotic characteristics, using Mahalanobis' D2 statistical method. Eight groups were formed in which two strains stood distinctly aloof, indicating thereby the exceptional nature of these strains over others in their symbiotic behaviour. This method is suggested for selecting exceptional strains for particular symbiotic characteristics as well as for greater N fixing efficiency with varieties and for different agroclimatic conditions.
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555
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Kundu SC, Majumdar S, Bhattacherjee TD, De TK, Sen A, Mookerjea PK. A profile of sick sinus syndrome. Indian Heart J 1976; 28:223-9. [PMID: 1022668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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556
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Sen A, Todaro GJ. Specificity of in vitro binding of primate Type C viral RNA and the homologous viral p12 core protein. Science 1976; 193:326-8. [PMID: 180601 DOI: 10.1126/science.180601] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The binding of type C viral p12 proteins to purified viral RNA has been examined in vitro with the use of a family of closely related infectious primate type C viruses--the woolly monkey (SSAV) and gibbon (GALV) group. This in vitro protein-RNA binding is type specific. The system should serve as a model for studies of the evolution of nucleic acid binding proteins.
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557
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Roy J, Som S, Sen A. Isolation, purification, and some properties of a lectin and abrin from Abrus precatorius linn. Arch Biochem Biophys 1976; 174:359-61. [PMID: 7206 DOI: 10.1016/0003-9861(76)90357-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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558
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Abstract
The major viral phosphoproteins (p12) of the Rauscher murine leukemia virus (R-MuLV) and the simian sarcoma-associated virus (SSAV) bind in vitro to their homologous 70S and 35S viral RNAs. Using purified 32P-labeled RNA and 125I-labeled p12 protein, complexes that are stabilized by formaldehyde-cross-linking can be readily detected after velocity gradient centrifugation. The in vitro reconstructed ribonucleoprotein complexes are seen only with p12 proteins incubated with viral RNAs isolated from the same type C viruses; no such complexes form with heterologous protein-RNA mixtures. Homologous but not heterologous p12 molecules compete with radiolabeled p12 protein for the specific viral RNA binding sites. The competition assay permits the detection of 10 ng of viral p12 protein. The major internal protein of type C viruses (p30) does not bind to viral RNA using identical assay conditions. From the specific activities of the radiolabeled components and also by equilibrium sedimentation analysis, we estimate that fewer than 15 molecules of p12 protein bind to each molecule of viral RNA. Both the specificity and stoichiometry of the p12-RNA interactions suggest that these RNA tumor virus proteins have a regulatory role in cells.
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559
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Laipis PJ, Sen A, Levine AJ, Mulder C. DNA replication in SV40 infected cells X. The structure of the 16 S gap circle intermediate in SV40 DNA synthesis. Virology 1975; 68:115-23. [PMID: 171842 DOI: 10.1016/0042-6822(75)90153-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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560
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Sen A, Sinha NK, Wright JD. On-line identification of the parameters of a dual-input heat-exchanger system. CAN J CHEM ENG 1974. [DOI: 10.1002/cjce.5450520526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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561
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Sen A, Hancock R, Levine AJ. The properties and origin of the proteins in the SV40 nucleoprotein complex. Virology 1974; 61:11-21. [PMID: 4370492 DOI: 10.1016/0042-6822(74)90237-2] [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: 01/10/2023]
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562
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Sen A, Levine AJ. SV40 nucleoprotein complex activity unwinds superhelical turns in SV40 DNA. Nature 1974; 249:343-4. [PMID: 4366777 DOI: 10.1038/249343a0] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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563
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Iswaran V, Sen A. Some studies on the groundnut Rhizobium symbiosis. ZENTRALBLATT FUR BAKTERIOLOGIE, PARASITENKUNDE, INFEKTIONSKRANKHEITEN UND HYGIENE. ZWEITE NATURWISSENSCHAFTLICHE ABT.: ALLGEMEINE, LANDWIRTSCHAFTLICHE UND TECHNISCHE MIKROBIOLOGIE 1974; 129:477-80. [PMID: 4480493 DOI: 10.1016/s0044-4057(74)80010-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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564
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Pillai RN, Sen A. Salt tolerance of Rhizobium from Dolichos lablab. ZENTRALBLATT FUR BAKTERIOLOGIE, PARASITENKUNDE, INFEKTIONSKRANKHEITEN UND HYGIENE. ZWEITE NATURWISSENSCHAFTLICHE ABT.: ALLGEMEINE, LANDWIRTSCHAFTLICHE UND TECHNISCHE MIKROBIOLOGIE 1973; 128:538-42. [PMID: 4801560 DOI: 10.1016/s0044-4057(73)80075-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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565
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Iswaran V, Sen A, Apte R. A simple medium for quick growth of Rhizobium japonicum. ZENTRALBLATT FUR BAKTERIOLOGIE, PARASITENKUNDE, INFEKTIONSKRANKHEITEN UND HYGIENE. ZWEITE NATURWISSENSCHAFTLICHE ABT.: ALLGEMEINE, LANDWIRTSCHAFTLICHE UND TECHNISCHE MIKROBIOLOGIE 1973; 128:23-4. [PMID: 4580100 DOI: 10.1016/s0044-4057(73)80034-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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566
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James E, Shende ST, Sen A. [Salt tolerance of Azotobacter chroococcum strains from the rhizosphere of agricultural crops]. MIKROBIOLOGIIA 1972; 41:374-5. [PMID: 5043519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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567
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Ghosh SK, Chaudhuri S, Roy J, Sinha NK, Sen A. Physicochemical investigations on buffalo -lactoglobulin. Studies on sedimentation, diffusion, and hydrogen ion titration. Arch Biochem Biophys 1971; 144:6-15. [PMID: 5117539 DOI: 10.1016/0003-9861(71)90450-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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568
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Sen A, Roman I. EEG and the mobility of attention in a group of adolescents with behavioral disturbances. ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY 1971; 30:364. [PMID: 4103537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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569
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570
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Aschaffenburg R, Sen A, Thompson MP. The caseins of buffalo milk. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1968; 27:621-3. [PMID: 5758390 DOI: 10.1016/0010-406x(68)90262-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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571
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Gupta KG, Sen A. Efficiency of isolates of Rhizobium leguminosarum (pea) in relation to their dimensions. Folia Microbiol (Praha) 1968; 13:501-4. [PMID: 5721250 DOI: 10.1007/bf02874221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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572
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Sen A, Clarke AM. The effect of distraction during and after learning a serial recall task. AMERICAN JOURNAL OF MENTAL DEFICIENCY 1968; 73:46-9. [PMID: 5673504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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573
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Ghose AC, Chaudhuri S, Sen A. Hydrogen ion equilibria and sedimentation behavior of goat beta-lactoglobulin. Comparison of goat and bovine beta-lactoglobulins. Arch Biochem Biophys 1968; 126:232-43. [PMID: 5671066 DOI: 10.1016/0003-9861(68)90579-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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574
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Sen A, Clarke AM. Some factors affecting distractibility in the mental retardate. AMERICAN JOURNAL OF MENTAL DEFICIENCY 1968; 73:50-60. [PMID: 5673505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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575
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Aschaffenburg R, Sen A, Thompson MP. Genetic variants of casein in Indian and African Zebu cattle. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY 1968; 25:177-84. [PMID: 5657194 DOI: 10.1016/0010-406x(68)90924-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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