51
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Tanaka H. Precursor-product relationship between nonglycosylated polypeptides of A and B particles of mouse mammary tumor virus. Virology 1977; 76:835-50. [PMID: 65829 DOI: 10.1016/0042-6822(77)90263-x] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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52
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Yagi MJ, Compans RW. Structural components of mouse mammary tumor virus. I. Polypeptides of the virion. Virology 1977; 76:751-66. [PMID: 190773 DOI: 10.1016/0042-6822(77)90256-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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53
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Kennel SJ. Purification of a glycoprotein from mouse ascites fluid by immunoaffinity chromatography which is related to the major glycoprotein of murine leukemia viruses. Immunologic and structural comparison with purified viral glycoproteins. J Biol Chem 1976. [DOI: 10.1016/s0021-9258(20)81844-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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54
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Schochetman G, Schlom J. Independent polypeptide chain initiation sites for the synthesis of different classes of proteins for an RNA tumor virus: mouse mammary tumor virus. Virology 1976; 73:431-41. [PMID: 183363 DOI: 10.1016/0042-6822(76)90404-9] [Citation(s) in RCA: 34] [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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55
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Friedrich R, Morris VL, Goodman HM, Bishop JM, Varmus HE. Differences between genomes of two strains of mouse mammary tumor virus as shown by partial RNA sequence analysis. Virology 1976; 72:330-40. [PMID: 181905 DOI: 10.1016/0042-6822(76)90162-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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56
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Abstract
Undisrupted mouse mammary tumor virus (MuMTV) derived from the milk of of RIII mice has been analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and electron microscopy after treatment with insolubilized trypsin. No alterations were found in viral fine structure by either freeze-etch or negative-stain electron microscopy. No alterations were found in the ability of trypsinized virus to compete in a radioimmune assay for viral antigens. Infectivity experiments indicate no significant differences in the ability of treated virus to infect C57Bl mice. However, significant differences were observed in polypeptide composition. The intensely periodic acid-Schiff-positive band, gp140, was shown by galactose oxidase-borotritide labeling to be degraded into a fragment of 125,000 molecular weight. The major glycoprotein, gp55, was split into fragments of 36,000 and 23,000 molecular weight, both of which stained with periodic acid-Schiff stain. Gp68 was removed from the virus. Experiments with purified, iodinated gp55 showed that the trypsin-induced fragments of gp55 were immunologically active. We conclude that: (i) certain glycoproteins at the surface of MuMTV are accessible to an insoluble form of trypsin, (ii) the trypsin causes a nick in the polypeptide chain without affecting the configuration of the molecule; (iii) the nicked molecules remain bound to the virus; and (iv) the presence of these nicked molecules does not interfere with the biological or antigenic expression of virus function.
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57
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Schloemer RH, Schlom J, Schochetman G, Kimball P, Wagner RR. Sialylatin of glycoproteins of murine mammary tumor virus, murine leukemia virus, and Mason-Pfizer monkey virus. J Virol 1976; 18:804-8. [PMID: 178911 PMCID: PMC515612 DOI: 10.1128/jvi.18.2.804-808.1976] [Citation(s) in RCA: 13] [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
Neuraminidase treatment of mouse mammary tumor virus, Rauscher murine leukemia virus, and Mason-Pfizer monkey virus resulted in loss of their capacity to inhibit hemagglutination of influenza virus. Hemagglutination-inhibition activity of these RNA tumor viruses could be restored by in vitro resialylation catalyzed by sialyl transferase. The major glycoprotein in the intact envelope of desialylated and, to some extent, native virions could be specificallly labeled in vitro with CMP-(14C) sialic acid. These studies further characterize the individual glycoproteins of mouse mammary tumor virus, Rauscher murine leukemia virus, and Mason-Pfizer monkey virus.
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58
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Robertson DL, Yau P, Dobbertin DC, Sweeney TK, Thach SS, Brendler T, Thach RE. Relationships between intracisternal type A and extracellular oncornavirus-like particles produced in murine MOPC-460 myeloma cells. J Virol 1976; 18:344-55. [PMID: 56464 PMCID: PMC515553 DOI: 10.1128/jvi.18.1.344-355.1976] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Oncornavirus-like particles of the "A" (both intracisternal and intracytoplasmic) and "B" or "C" (extracellular) types are produced by murine MOPC-460 myeloma cells. This communication describes a comparative study on tracisternal A and extracellular particles. Both types of particles contain an RNA-dependent DNA polymerase activity, traces of 35S and 70 S RNA in addition to larger amounts of degraded RNA, and proteins of approximately 76,000 and 45, 000 daltons. The 76,000-dalton proteins from intracisternal A and extracellular particles have the same cyanogen bromide peptides. Hybridization kinetic analysis indicates that the RNAs in the two particles are identical or very closely related and share partial homology with Moloney leukemia virus RNA. In contrast, the particles appear to have little or no relationship to murine mammary tumor virus as judged by several different criteria. Electron microscope studies indicate that the extracellular particles arise from the budding of core components through the plasma membrane. These results suggest that the intracisternal A and extracellular oncornavirus-like particles produced by MOPC-460 cells are closely related.
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59
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Sheffield JB, Daly TM. Extrinsic labeling of MuMTV with a galactose oxidase-tritiated borohydride method. Virology 1976; 70:247-50. [PMID: 176809 DOI: 10.1016/0042-6822(76)90265-8] [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: 12/13/2022]
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60
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Calberg-Bacq CM, Francois C, Gosselin L, Osterrieth PM, Rentier-Delrue F. Comparative study of the milk fat globule membrane and the mouse mammary tumour virus prepared from the milk of an infected strain of Swiss albino mice. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 419:458-78. [PMID: 174729 DOI: 10.1016/0005-2736(76)90259-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Milk fat globule membranes and mammary tumour virus particles (d=1.17 g/cm3) have been obtained from the milk of a Swiss albino mice strain. Comparative biochemistry shows that these two structures differ significantly in the phospholipid, polypeptide and glycopolypeptide patterns and enzymatic activities. However, the lipid profile and the morphology of both structures suggest a filiation with the plasma membrane. Density fractions obtained from the crude virus preparation have been thoroughly investigated. The results suggest that most of these fractions represent degraded virus and/or atypical virus assembly.
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61
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Sarkar NH, Taraschi NE, Pomenti AA, Dion AS. Polypeptides of the mouse mammary tumor virus. II. Identification of two major glycoproteins with the viral structure. Virology 1976; 69:677-90. [PMID: 176790 DOI: 10.1016/0042-6822(76)90496-7] [Citation(s) in RCA: 34] [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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62
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Dickson C, Puma JP, Nandi S. Identification of a precursor protein to the major glycoproteins of mouse mammary tumor virus. J Virol 1976; 17:275-82. [PMID: 173889 PMCID: PMC515412 DOI: 10.1128/jvi.17.1.275-282.1976] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mouse mammary tumor virus-producing cultures of mouse mammary tumor cells synthesize a viral-related polypeptide of molecular weight of 73,000 (gp 73) which is rapidly labeled during a short pulse but disappears during the chase concomitantly with the appearance of label in the virion glycoproteins gp 49 and gp 37.5/33.5. The addition of the protein synthesis-inhibitor cycloheximide to the chase medium has little effect on this conversion. Treatment of the proposed precursor with alpha-chymotrypsin leads to the formation of a polypeptide of molecular weight 49,000, similar to the major virion glycoprotein. A comparison of tryptic digest maps of the glycoproteins involved supports the hypothesis that both the viral glycoproteins gp 49 and gp 37.5/33.5 are derived from gp 73.
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63
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Schochetman G, Kortright K, Schlom J. Mason-Pfizer monkey virus: analysis and localization of virion proteins and glycoproteins. J Virol 1975; 16:1208-19. [PMID: 810603 PMCID: PMC355720 DOI: 10.1128/jvi.16.5.1208-1219.1975] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The polypeptide composition of Mason-Pfizer monkey virus was determined using sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Six major polypeptides of molecular weights 68,000, 27,000, 20,000, 14,000, 12,000, and 10,000 were resolved regardless of the cell type (i.e., two human and two rhesus) in which the virus was grown. Protein gp68 (68,000) represented the major virus glycoprotein and protein gp20 (20,000) represented a minor glycoprotein of the virion, again regardless of the cell type of origin of the virus. Protein gp68 appears to be located on the outer surface of the viral envelope, as demonstrated by lactoperoxidase catalyzed iodination of intact virions. Additional glycoproteins were shown to be virion associated; their presence depended, however, on the cell type in which the virus was propagated.
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64
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Dickson C, Puma JP, Nandi S. Intracellular synthesis of mouse mammary tumor virus polypeptides: indication of a precursor glycoprotein. J Virol 1975; 16:250-8. [PMID: 168401 PMCID: PMC354661 DOI: 10.1128/jvi.16.2.250-258.1975] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mouse mammary tumor virus polypeptides were detected in the cytoplasm of mouse mammary tumor cell cultures using immunological precipitation techniques. The anti-mouse mammary tumor virus serum precipitated the major virion glycoproteins gp49 and gp37.5/33.5 and a viral-related nonvirion glycoprotein of 76,000 daltons. Subcellular fractionation studies revelaed that the cell-associated virion glycoproteins were present in the membrane fraction. Pulsechase experiments indicated that a viral-related nonvirion glycoprotein of 76,000 daltons may be a precursor to one or more of the virion glycoproteins.
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65
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Sarkar NH, Dion AS. Polypeptides of the mouse mammary tumor virus. I. Characterization of two group-specific antigens. Virology 1975; 64:471-91. [PMID: 49121 DOI: 10.1016/0042-6822(75)90125-7] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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66
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67
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Porter WH, Winzler RJ. Purification and chemical characterization of the major glycoprotein of avian myeloblastosis virus. Arch Biochem Biophys 1975; 166:152-63. [PMID: 164824 DOI: 10.1016/0003-9861(75)90375-6] [Citation(s) in RCA: 10] [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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68
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Bentvelzen P. Host-virus interactions in murine mammary carcinogenesis. BIOCHIMICA ET BIOPHYSICA ACTA 1974; 355:236-59. [PMID: 4142395 DOI: 10.1016/0304-419x(74)90012-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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69
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Cardiff RD, Puentes MJ, Teramoto YA, Lund JK. Structure of the mouse mammary tumor virus: characterization of bald particles. J Virol 1974; 14:1293-303. [PMID: 4372399 PMCID: PMC355648 DOI: 10.1128/jvi.14.5.1293-1303.1974] [Citation(s) in RCA: 47] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The polypeptide, antigenic, and morphological structure of the mouse mammary tumor virus was studied following protease digestion of intact virions. Intact, untreated virions (rho = 1.17 g/ml) had characteristic envelope spikes, five major polypeptides, and were precipitated by antisera against gp52. Two of the major polypeptides, with molecular weights of 52,000 (gp52) and 36,000 (gp36), had carbohydrate moieties. Protease treatment resulted in spikeless, "bald" particles (rho = 1.14 g/ml), which had altered surface antigenicity and which contained neither gp52 nor gp36. These data indicated that gp52 and gp36 were on the viral envelope. Bald particles retained a 28,000 dalton polypeptide (p28) which was proposed as the major internal polypeptide.
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70
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Parks WP, Howk RS, Scolnick EM, Oroszlan S, Gilden RV. Immunochemical characterization of two major polypeptides from murine mammary tumor virus. J Virol 1974; 13:1200-10. [PMID: 4364896 PMCID: PMC355439 DOI: 10.1128/jvi.13.6.1200-1210.1974] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A major murine mammary tumor viral (MMTV) antigen, sl, originally described by Nowinski et al. (1967, 1968, 1971), has been purified from RIII mouse milk MMTV by sequential ion-exchange and gel chromatography. The purified protein with sl antigenic reactivity contains carbohydrate, and has an apparent minimal molecular weight of 52,000. It can be designated as gp52 (sl). Another major MMTV viral protein with a molecular weight of 27,000 has also been isolated, and antisera have been prepared against it. Both MMTV gp52 (sl) and p27 viral polypeptides have been iodinated with (125)I and used in immunoprecipitation and competition assays. The two MMTV proteins differ absolutely from each other and from major mouse type C viral polypeptides in molecular weight, immunological reactivity, and amino acid composition. Purified gp52 (sl) in radioimmunoprecipitation inhibition assays reacted in two distinct patterns. One pattern showed partial displacement of antibody which could be converted to the second, a complete displacement, by heating the antigen, presumably by exposing additional reactive determinants. Biologically, the patterns of major MMTV polypeptide expression in milk correlated with spontaneous mammary tumor incidence in different strains of mice, indicating that the sl antigen is group specific for MMTV or that several mouse strains contain the same virus type.
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71
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