RNA synthesis on native DNA complexes isolated from Streptomyces griseus and Escherichia coli

Ferenc Szeszák, Gábor Szabó, Janos Sumegi

Research output: Contribution to journalArticle

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Abstract

1. A native DNA fraction was isolated from the young vegetative mycelium of Streptomyces griseus strain No. 52-1 and was compared with a similar fraction of Escherichia coli B. The endogenous RNA polymerase activities of these DNA fractions were examined. 2. Determining the base composition of the 14C labelled RNA synthesized in vitro, it was found that the conversion of 14C UTP into CMP residue of RNA is negligible in the DNA fraction of S. griseus, while it is significant in the DNA fraction of E. coli. By the proof of density gradient centrifugation, the RNA synthesized in vitro was mainly of messenger size in both species. 3. Template activity of the native DNA fractions was investigated in the presence of isolated E. coli RNA polymerase. When measuring the endogenous RNA polymerase and template activities of the DNA complexes at lower and higher ionic strength it was established that DNA complexes of E. coli under both ionic conditions behaved essentially as free DNA strands did, while endogenous and exogenous RNA polymerase activities in DNA complexes of S. griseus are inhibited in medium of lower ionic strength. Our results indicate the presence of some additional compound in the S. griseus aggregate which is absent in E. coli. This compound could function at lower ionic strength while it would be inactivated at higher ionic strength.

Original languageEnglish (US)
Pages (from-to)368-378
Number of pages11
JournalArchiv für Mikrobiologie
Volume73
Issue number4
DOIs
StatePublished - Dec 1 1970

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Streptomyces griseus
Escherichia coli
RNA
DNA
DNA-Directed RNA Polymerases
Ionic strength
Osmolar Concentration
Cytidine Monophosphate
Uridine Triphosphate
Density Gradient Centrifugation
Centrifugation
Mycelium
Base Composition

ASJC Scopus subject areas

  • Medicine(all)

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RNA synthesis on native DNA complexes isolated from Streptomyces griseus and Escherichia coli. / Szeszák, Ferenc; Szabó, Gábor; Sumegi, Janos.

In: Archiv für Mikrobiologie, Vol. 73, No. 4, 01.12.1970, p. 368-378.

Research output: Contribution to journalArticle

Szeszák, Ferenc ; Szabó, Gábor ; Sumegi, Janos. / RNA synthesis on native DNA complexes isolated from Streptomyces griseus and Escherichia coli. In: Archiv für Mikrobiologie. 1970 ; Vol. 73, No. 4. pp. 368-378.
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