PubMed Health⌕ Search

Biomedical subjects

H Zähner

Publications and source records attributed to H Zähner.

At least 91 records · Page 5Linked to original sources
PubMed1976

Metabolic products of microorganisms. 155. Modes of action of rinamycin and derinamycin.

Rinamycin interfered with DNA-polymerase I of Escherichia coli in cell-free systems more effectively than actinomycin C. Its inhibitory action could be relieved by increasing the concentration of polymerase. The rinamycin concentrations that caused effective inhibition of the RNA-polymerase reaction in vitro were approximately 10 times higher than those required to inhibit the DNA-polymerase reaction in vitro.

Anti-Bacterial Agents↗
PubMed1976

Metabiolic products of microorganisms. Tirandamycin B(author's transl).

Streptomyces flaveolus, strain Tü 1240 produces besides Tirandamycin A, a hitherto unknown antibiotic, which is closely related to Tirandamycin A. The new antibiotic Tirandamycin B contains one additional hydroxylgroup. Both antibiotics exhibit a similar antimicrobial spectrum and they seem to have the same mechanism of action. According to the data obtained from mass spectrometry, 13C-and 1H-NMR spectra formula II could be deduced for Tirandamycin B.

Aminoglycosides↗
PubMed1975

[Metabolic products of microorganisms, 149. Lysolipin I, a new antibiotic from streptomyces violaceoniger (author's transl)].

From the cultures of Streptomyces violaceoniger, strain Tü 96, two new lipophilic antibiotics, Lysolipin I and Lysolipin X were isolated. The latter one is chemically unstable and is easily transformed to Lysolipin I. The deeply yellow Lysolipin I has a molecular formula C29H24CINO11. It was characterized by the ir, uv, H-nmr and 13C-nmr spectra, which make a quinone structure very probable. Lysolipin I is active against Gram-positive and Gram-negative bacteria. However, enterobacteriae are only inhibited in high dilution, when the membrane permeation is damaged. Lysolipin I acts lytically against bacterial cells. Its activity is decreased by several lipids. The site of action is the biosynthesis of bacterial cell walls, an interaction with the carrier lipid for mureine intermediates being probable.

Anti-Bacterial Agents↗
PubMed1975

Metabolic products of microorganisms 137. Rinamycin, a new inhibitor of RNA synthesis.

A new antibiotic rinamycin was isolated from the culture mycelium of a streptomycete designated as Streptomyces venezuelae TU 1102. The antibiotic was obtained as a honey-coloured powder having the tentative molecular formula C20H55N08. It exhibits a significant inhibition of fungi, yeasts, gram-negative bacteria. The primary site of action of the antibiotic was suggested to be the RNA metabolism of rinamycin-sensitive cells.

Anti-Bacterial Agents↗
PubMed1975

Metabolic products of microorganisms 142. A new antibiotic derinamycin, inhibitor of DNA and RNA synthesis.

Derinamycin was isolated from the myecelium of Streptomyces venezuelae Tü 1102 and its molecular formula was tentatively assigned as C51H93NO23. The antibiotic inhibits the growth of fungi, gram-positive bacteria and certain gram-negative bacteria but is less acitve against yeasts. A study of derinamycin action on the macromolecular synthesis of intact Bacillus subtilis revealed that the antibiotic suppressed DNA and RNA syntheses but that protein synthesis was less affected. Derinamycin exerted no selective inhibition between DNA and RNA syntheses in the double-isotope experiment used to assess the relative effects of the antibiotic.

Anti-Bacterial Agents↗