title: Antimicrobial compounds produced by Actinomadura sp. AC104 isolated from an Algerian Saharan soil.
abstract: During a search for nonpolyenic antifungal antibiotics, an actinomycete designated AC104 was isolated from a Saharan soil sample by a dilution agar plating method using a chitin - vitamins B medium supplemented with rifampicin. Isolate AC104 presented the morphological and the chemical characteristics of the genus Actinomadura. On the basis of 76 physiological tests and 16S rDNA analysis, this isolate was determined to be quite different from the known species of Actinomadura. It is active against filamentous fungi and both Gram-positive and Gram-negative bacteria. The production of antibiotic substances was investigated using several culture media. The highest antimicrobial activities were obtained on ISP2 medium. The benzenic extract contained five bioactive spots detected on thin layer chromatography plates. Among these antibiotics, a complex called 104A, which showed the more interesting antifungal activity, was selected and purified by reverse-phase high-pressure liquid chromatography. This complex is composed of four compounds. Ultraviolet-visible, infrared, mass, and 1H nuclear magnetic resonance spectroscopy studies showed that these molecules contain an aromatic ring substituted by aliphatic chains. These compounds differ from the known antibiotics produced by Actinomadura species.
authors.affiliation: Laboratoire de Recherche sur les Produits Bioactifs et la Valorisation de la Biomasse, Ecole Normale Supérieure de Kouba, Biskra.
authors.forename: B
authors.initials: B
authors.lastname: Badji
authors.forename: A
authors.initials: A
authors.lastname: Zitouni
authors.forename: F
authors.initials: F
authors.lastname: Mathieu
authors.forename: A
authors.initials: A
authors.lastname: Lebrihi
authors.forename: N
authors.initials: N
authors.lastname: Sabaou
mesh_terms: D000192:Actinomycetales / Q000235:genetics / Q000378:metabolism* / Q000648:ultrastructure; D000462:Algeria; D000900:Anti-Bacterial Agents / Q000032:analysis / Q000096:biosynthesis / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology; D000935:Antifungal Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D017077:Culture Media, Conditioned / Q000737:chemistry; D003889:Desert Climate; D005658:Fungi / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D046529:Microscopy, Electron, Transmission; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012988:Soil Microbiology; D013696:Temperature
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D017077:Culture Media, Conditioned; D012336:RNA, Ribosomal, 16S