Abstract
The DNA-dependent RNA polymerases of Schneider 2-L cells of Drosophila melanogaster are described. These cells contain five readily detectable forms of this enzyme, polymerases Ia, Ib, IIIa, II, and IIIb, which elute from DEAE-Sephadex at 0.08, 0.12, 0.15, 0.20, and 0.22 m ammonium sulfate, respectively. RNA polymerases IIIa and IIIb, which each constitute about 5–10% of the total RNA polymerase activity in Drosophila embryos, are found to constitute 30 and 10%, respectively, of the total polymerase activity in cultured cells. The two form III polymerases are further characterized by in vitro response to divalent cations and ionic strength, template utilization, and sensitivity to α-amanitin. Verification of the class III designation of these two polymerases is provided by their sensitivity to only very high levels of α-amanitin (50% inhibition at approximately 800 µg/ml), their 10-fold greater activity on poly[d(A–T)], and their elution from DEAE-cellulose at lower ionic strengths than from DEAE-Sephadex.
Similar content being viewed by others
References
Chambon, P. (1974). Eukaryotic RNA polymerases. In Boyer, P. D. (ed.), The Enzymes, Vol. X Academic Press, New York, p. 261.
Chambon, P. (1975). Eukaryotic nuclear RNA polymerases. Annu. Rev. Biochem. 43613.
Gissinger, F., Kedinger, C., and Chambon, P. (1974). Animal DNA-dependent RNA polymerases. X. General enzymatic properties of purified calf thymus RNA polymerases AI and B. Biochemie 56319.
Greenleaf, A. L., and Bautz, E. K. F. (1975). RNA polymerase B from Drosophila melanogaster larvae: Purification and partial characterization. Eur. J. Biochem. 60179.
Gross, R. H., and Beer, M. (1975). The RNA polymerases from Drosophila melanogaster. Biochemistry 144024.
Gundelfinger, E., Saumweber, H., Dallendorfer, A., and Stein, H. (1980). RNA polymerase III from Drosophila hydei pupae. Eur. J. Biochem. 111395.
Lowry, O. H., Rosebrough, N. J., Farr, A. O., and Randall, R. J. (1951). Protein measurement with the Folin phenol reagent. J. Biol. Chem. 193265.
Phillips, J. P. (1979). Form II DNA-dependent RNA polymerase from Drosophila melanogaster: General in vitro catalytic properties and template interactions. Biochem. Genet. 1777.
Phillips, J. P., and Forrest, H. S. (1973). Deoxyribonucleic acid-dependent ribonucleic acid polymerase from Drosophila melanogaster embryos. J. Biol. Chem. 248265.
Phillips, J. P., and Sumner-Smith, M. (1977). Form III RNA polymerase from Drosophila nuclei: Multiple forms and loss of α-amanitin sensitivity. Insect Biochem. 7323.
Roeder, R. G. (1976). Eukaryotic nuclear RNA polymerases. In Losick, R., and Chamberlin, M. (eds.), RNA Polymerase Cold Springs Harbor Laboratory, Cold Spring Harbor, N.Y., p. 803.
Schwartz, L. B., Sklar, V. E. F., Jeahning, J., Weinmann, R., and Roeder, R. G. (1974). Isolation and partial characterization of the multiple forms of deoxyribonucleic acid-dependent ribonucleic acid polymerase in mouse myeloma, MOPC 315. J. Biol. Chem. 2495889.
Sklar, V. E. F., Yamamoto, M., and Roeder, R. G. (1976). Molecular structures of eukaryotic class III RNA polymerases. In Losick, R., and Chamberlin, M. (eds.), RNA Polymerase Cold Spring Harbor Laboratory, Cold Spring Harbor, N.Y., p. 803.
Sumner-Smith, M., and Phillips, J. P. (1979). RNA synthesis in isolated Drosophila nuclei. Insect Biochem. 955.
Weinmann, R., and Roeder, R. G. (1974). Role of DNA-dependent RNA polymerase III in transcription of the tRNA and 5S RNA genes. Proc. Natl. Acad. Sci. USA 711970.
Author information
Authors and Affiliations
Additional information
This work was supported by the Natural Sciences and Engineering Research Council.
Rights and permissions
About this article
Cite this article
Phillips, J.P., Somers, D.G. & Feng, C. DNA-dependent RNA polymerases from Schneider 2-L cells of Drosophila. I. Preliminary characterization. Biochem Genet 20, 659–673 (1982). https://doi.org/10.1007/BF00483963
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00483963