The present study highlights the biological effects of chromomycin A2 toward metastatic melanoma cells in culture. Besides chromomycin A2, chromomycin A3 and demethylchromomycin A2 were also identified from the extract derived from Streptomyces sp., recovered from Paracuru Beach, located in the northeast region of Brazil. The cytotoxic activity of chromomycin A2 was evaluated across a panel of ...

We have studied the effects of chromomycin and of a triple-helix-forming oligonucleotide (TFO) that recognizes Sp1 binding sites on protein-DNA interactions and HIV-1 transcription. Molecular interactions between chromomycin, the Sp1 TFO and target DNA sequences were studied by gel retardation, triplex affinity capture using streptavidin-coated magnetic beads and biosensor technology. We also d...

The interactions of self-complementary oligonucleotides with a group of metal-mediated DNA-binding drugs, including chromomycin A(3), mithramycin and the novel compound UK-1, were examined via electrospray ionization quadrupole ion trap mass spectrometry. Both chromomycin and mithramycin were shown to bind preferentially to GC-rich oligonucleotide duplexes in a 2:1 drug:metal ratio, while UK-1 ...

All of the 2,6-dideoxy sugars contained within the structure of chromomycin A3 are derived from D-glucose. Enzyme assays were used to confirm the presence of hexokinase, phosphoglucomutase, UDPG pyrophosphorylase (UDPGP), and UDPG oxidoreductase (UDPGO), all of which are involved in the pathway of glucose activation and conversion into 2,6-dideoxyhexoses during chromomycin biosynthesis. Levels ...

The effects of treatment with various doses of carcinostatic agents on tumor growth have been studied. In animal experiments. treatment with low concentrations of nitrogen mustard N-oxide resulted in an early death of mh:e bearing Ehrlich ascites carcinoma and an increase in the number of circulating Yoshida sarcoma cells. The growth of subcutaneously implanted Yoshida sarcoma was stimulated af...

Dual beam flow cytometry of chromosomes stained with Hoechst 33258 and chromomycin A3 has been proposed as a method for quantitative classification of human chromosomes (bivariate flow karyotyping). In this paper we investigate the sources and magnitudes of variability in the mean fluorescence intensities of each chromosome group resolved in bivariate flow karyotypes and study the impact of thi...

Chromomycin A3 is an antitumor drug produced by Streptomyces griseus subsp. griseus. It consists of a tricyclic aglycone with two aliphatic side chains and two O-glycosidically linked saccharide chains, a disaccharide of 4-O-acetyl-D-oliose (sugar A) and 4-O-methyl-D-oliose (sugar B), and a trisaccharide of D-olivose (sugar C), D-olivose (sugar D), and 4-O-acetyl-L-chromose B (sugar E). The chr...

The characteristics of the surface of guinea pig megakaryocytes were investigated with wheat germ agglutinin (WGA). Purified guinea pig megakaryocytes and platelets were incubated with WGA conjugated with rhodamine, cytocentrifuged, and then exposed to Chromomycin A3 for the assessment of ploidy. The fluorescence emission of the DNA-Chromomycin complex was similar to that of fluorescein, and th...

Three populations of the genus Crenicichla, namely Crenicichla iguassuensis, Crenicichla sp 1 and Crenicichla sp 2, from the Iguaçu River, were analyzed cytogenetically, and their nucleolus organizer regions, constitutive heterochromatin distribution and chromomycin A3 markings were studied. Karyotype analyses showed a diploid number of 48 chromosomes, made up of 2 metacentric pairs, 2 submetac...