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The novel screening strategy called "biomolecular-chemical screening" combines the advantages of the chemical screening approach--the analysis of the chromatographic and chemical behaviour of secondary metabolites on TLC plates--with binding studies of these molecules with bio-macromolecules like DNA. This approach was advantageously used to detect the interaction of pure compounds with DNA. In order to prove the reliability of the biomolecular-chemical screening and to examine DNA-binding properties, 470 pure secondary metabolites were analysed by this method. Besides the confirmation of already known binders with the TLC-based method, for a number of natural products DNA-binding properties were discovered for the first time. In consequence, binding of pure compounds can be measured by 1D TLC in a reliable and easy manner, in which DNA is applied together with the test compound at the starting spot. Analysis is performed via differences in Rf-values in comparison to a reference chromatogram without DNA.

journal of antibiotics

Bionrolecular-chemical Screening. A Novel Screening Approach for the Discovery of Biologically Active Secondary Metabolites. II. Application Studies with Pure Metabolites.