RNA synthesis in division synchronized Tetrahymena: macronuclear and cytoplasmic RNA
- PMID: 826626
- DOI: 10.1111/j.1550-7408.1976.tb03849.x
RNA synthesis in division synchronized Tetrahymena: macronuclear and cytoplasmic RNA
Abstract
Synthesis of RNA in the macronucleus and appearance of RNA in the cytoplasm were studied in heat synchronized Tetrahymena pyriformis GL and compared to those found under conditions of logarithmic growth (28 C) and during heat shocks (34 C). In macronuclei of logarithmically growing cells precursors were processed to 2 rRNA species (25S and 17S). In addition, another RNA (15S), more homogeneous than the RNA (8-15S) in the cytoplasm, was observed in the macronucleus. Both 17S and 25S rRNA species were found in the cytoplasm, 17S rRNA appearing more rapidly than 25S rRNA. Synthesis of rRNA was suppressed at 34 C in cells subjected to heat synchronization; 8-15S RNA synthesis appeared to be inhibited to a lesser extent. During the time preceding the first synchronized division, the synthesis of rRNAs in the macronucleus slowly recovered. Early in the cycle, almost no newly synthesized rRNAs were extracted. By 30 min after the last heat shock (EH), most of the RNA synthesized was not identified as rRNA. By 60 min after EH, the pattern of RNA synthesis had not returned to that observed in logarithmically growing cells.
Similar articles
-
Effect of puromycin on synthesis, processing, and nucleocytoplasmic translocation of rRNA in Tetrahymena pyriformis.Comp Biochem Physiol B. 1977;57(4):275-80. doi: 10.1016/0305-0491(77)90052-9. Comp Biochem Physiol B. 1977. PMID: 122555
-
Regulation of ribosomal RNA synthesis in Tetrahymena pyriformis.J Cell Sci. 1978 Jun;31:13-23. doi: 10.1242/jcs.31.1.13. J Cell Sci. 1978. PMID: 97302
-
Isolation of a high specific activity 35S ribosomal RNA precursor from Tetrahymena pyriformis and identification of its 5' terminus, pppAp.Biochemistry. 1978 Oct 31;17(22):4839-44. doi: 10.1021/bi00615a035. Biochemistry. 1978. PMID: 103568
-
Numbers of 5S and tRNA genes in macro- and micronuclei of Tetrahymena pyriformis.Chromosoma. 1976 Mar 10;54(4):327-37. doi: 10.1007/BF00292813. Chromosoma. 1976. PMID: 815076
-
Nucleic acids of Entamoeba histolytica.J Protozool. 1989 Mar-Apr;36(2):197-205. doi: 10.1111/j.1550-7408.1989.tb01074.x. J Protozool. 1989. PMID: 2470900 Review.
Cited by
-
Hierarchy of elements regulating synthesis of ribosomal proteins in Saccharomyces cerevisiae.Mol Cell Biol. 1981 Nov;1(11):1016-23. doi: 10.1128/mcb.1.11.1016-1023.1981. Mol Cell Biol. 1981. PMID: 7050662 Free PMC article.
MeSH terms
Substances
LinkOut - more resources
Full Text Sources