Streptomycetes Research Articles

Selection of streptomycetes with antimicrobial activity to the pathogens of bee's diseases.

Honey bees, as they forage for nectar and pollen, play a vital role in the environment and in preserving biodiversity by pollinating both wild flowers and many agricultural crops. The essential and valuable activities of bees depend upon beekeepers maintaining a healthy population of honey bees. In prophylaxis and pest control of infectious diseases, various medical preparations like tetracycline derivatives, sulfonamides, inactivated vaccines, are applied. Quite often for researching of effective remedies it is necessary to resort the search of some new antibiotics, to which the infections agent, allocated from the concrete centers, are sensitive. The article present the information about antimicrobial activity of some variants of strain S.canosus CNMN-71, received after γ and γ +UV irradiations

Neutrotolerant acidophilic Streptomyces species isolated from acidic soils in China: Streptomyces guanduensis sp. nov., Streptomyces paucisporeus sp. nov., Streptomyces rubidus sp. nov. and Streptomyces yanglinensis sp. nov.

The taxonomic status of six neutrotolerant acidophilic streptomycetes isolated from acidic soils in Yunnan Province, China, was established using a polyphasic approach. The morphological and chemotaxonomic characteristics revealed that the isolates belong to the genus Streptomyces. Almost complete 16S rRNA gene sequences of the isolates were determined and aligned with available corresponding sequences of representatives of the family Streptomycetaceae; phylogenetic trees were inferred using four tree-making algorithms. The isolates formed a distinct, albeit heterogeneous, subclade in the Streptomyces 16S rRNA gene tree together with the type strain of Streptomyces yeochonensis, but were readily distinguishable from the latter using DNA-DNA hybridization and phenotypic data. It was evident from the genotypic and phenotypic data that the isolates belonged to four novel Streptomyces species, for which the following names are proposed: Streptomyces guanduensis sp. nov. (type strain 701T=CGMCC 4.2022T=JCM 13274T), Streptomyces paucisporeus sp. nov. (type strain 1413T=CGMCC 4.2025T=JCM 13276T), Streptomyces rubidus sp. nov. (type strain 13c15T=CGMCC 4.2026T=JCM 13277T) and Streptomyces yanglinensis sp. nov. (type strain 1307T=CGMCC 4.2023T=JCM 13275T); isolates 317 and 913 belong to this latter species.

Interrelation of the Biosyntheses of Lipids, Lipoxygenase, and Lipase in Cultured Streptomycetes

Interrelation of the Biosyntheses of Lipids, Lipoxygenase, and Lipase in Cultured Streptomycetes

Antibiotic Terpenoid Chloro-Dihydroquinones from a New Marine Actinomycete

As part of our continuing interest in exploring the chemistry of actinomycete bacteria uniquely adapted for survival in ocean sediments, we encountered several new strains, which by 16S rDNA sequence-based phylogenetic analysis were recognized as members of a new genus (tentatively called MAR4) within the family Streptomycetaceae. We report here the isolation and structure elucidation of three new chlorinated dihydroquinones (1-3) and one previously reported analogue, 4, from our strain CNQ-525, isolated from ocean sediments collected at a depth of 152 m near La Jolla, California. The compounds formally possess new carbon skeletons, but are related to several previously reported metabolites of the napyradiomycin class. The structures of the new molecules, which possess significant antibiotic properties and cancer cell cytotoxicities, were assigned by comprehensive spectral measurements and by comparison with NMR and other spectral data from the antibiotic A80915C (5), the full stereostructure of which was recently assigned by X-ray diffraction methods.

Streptomyces viewed from the inside: the application of proteomics to a model streptomycete

Streptomyces coelicolor A3(2) has become the model system for this genus of antibiotic-producing bacteria, thanks to the life-time commitment of Sir David Hopwood to its genetic analysis. The determination of its complete genome sequence has made it an even more valuable model, opening up many analytical possibilities that emerge directly from the sequence, and also various functional genomics approaches.

Streptacidiphilus gen. nov., acidophilic actinomycetes with wall chemotype I and emendation of the family Streptomycetaceae (Waksman and Henrici (1943)AL) emend. Rainey et al. 1997.

The taxonomic position of acidophilic actinomycetes selectively isolated from acidic soils and litter was examined using a polyphasic approach. The distinct 16S rDNA phyletic branch formed by representative strains was equated with related monophyletic clades that corresponded to the genera Kitasatospora and Streptomyces. The acidophilic isolates also exhibited a distinctive pH profile, a unique 16S rDNA signature, and contained major amounts of LL-diaminopimelic acid, galactose and rhamnose in whole-organism hydrolysates. It is proposed that these acidophilic actinomycetes be assigned to a new genus, Streptacidiphilus gen. nov., on the basis of genotypic and phenotypic differences. Three species were defined on the basis of DNA:DNA pairing and phenotypic data, namely, Streptacidiphilus albus sp. nov., the type species, Streptacidiphilus neutrinimicus sp. nov. and Streptacidiphilus carbonis sp. nov. Members of the genera Kitasatospora, Streptacidiphilus and Streptomyces share a number of key characteristics and form a stable monophyletic branch in the 16S rDNA tree. It is, therefore, proposed that the description of the family Streptomycetaceae be emended to account for properties shown by Kitasatospora and Streptacidiphilus species.

Distribution of microbes producing antimicrobial epsilon-poly-L-lysine polymers in soil microflora determined by a novel method.

We developed a simple and sensitive screening method to investigate the distribution of microbes producing an antimicrobial poly(amino acid), epsilon-poly-L-lysine (epsilon-PL), in microflora. An acidic dye, Poly R-478, incorporated in an agar plate detected epsilon-PL producers by electrostatic interaction with the secreted basic polymers. All epsilon-PL producers, isolated after careful and sufficient screening of soil microflora, belonged exclusively to two groups of bacteria of the family Streptomycetaceae and ergot fungi. They were characterized based on the density and diameter of the concentric zone formed by the secreted polymers. The density depended on each isolate. The increase in the diameter of the concentric zone per unit of time varied among isolates and was negatively correlated with the molecular weight. Although the distribution of epsilon-PL producers was extremely limited, their products were structurally varied. The molecular masses of the secreted polymers among the isolates ranged from 0.8 to 2.0 kDa. There were also isolates producing unknown polymers inconsistent with the correlation or producing a mixture of polymers with original and modified structures. A chemically modified polymer was an epsilon-PL derivative, as determined by mass spectrometry. Since the structural variations had no relation to the phylogenetic position of the isolates, it is possible that enzymes involved in the synthesis diversified after putative horizontal transfers of relevant genes.

Optimization of culture conditions for indole-3-pyruvic acid production by Streptomyces griseoflavus

Thirty strains of actinomycetes were isolated from fertile soils in Egypt on starch–nitrate agar. The isolated organisms were recognized as spore formers with aerial mycelia containing L-DAP (diaminopimelic acid) and glycine. The inability of the vegetative mycelia to fragment into bacillary or coccoid forms and the presence of spores borne on sporophores, placed these organisms in the family Streptomycetaceae. The isolates also proved to be aerobic and Gram positive. The absence of DL-DAP and the presence of L-DAP in their cell hydrolysates, and the production of a wide range of pigments in the aerial and substrate mycelia, assigned these isolates to the genus Streptomyces. The isolated organisms were screened for production of plant growth regulators, and the most active producer of indole-3-pyruvic acid was examined further. Using the described morphological, physiological, and biochemical criteria for identification, this organism was identified as Streptomyces griseoflavus. The optimal culture conditions for maximal production of both cellular and extracellular indole-3-pyruvic acid by S. griseoflavus were investigated and shown to be as follows: a culture medium composed of (g∙100 mL−1) NH4NO3, 0.55; DL-tryptophan, 0.4; NaCl, 0.7; at pH 7 (buffered); with an incubation period of 6 days at 28 °C in the dark and under shaking conditions.Key words: actinomycetes, plant growth regulators, Streptomyces griseoflavus, indole-3-pyruvic acid, culture conditions.

Production of Major Extracellular Enzymes during Lignocellulose Degradation by Two Streptomycetes in Agitated Submerged Culture

[This corrects the article on p. 1167 in vol. 55.].

Isolation and identification of 7,8-didemethyl-8-hydroxy-5-deazariboflavin, an unusual cosynthetic factor in streptomycetes, from Streptomyces lincolnensis.

Isolation and identification of 7,8-didemethyl-8-hydroxy-5-deazariboflavin, an unusual cosynthetic factor in streptomycetes, from Streptomyces lincolnensis.

Involvement of cell impermeability in resistance to macrolides in some producer streptomycetes.

Involvement of cell impermeability in resistance to macrolides in some producer streptomycetes.

Construction and use of a bifunctional streptomycete cosmid

Construction and use of a bifunctional streptomycete cosmid

Numerical classification of Streptomyces and related genera.

Four hundred and seventy-five strains, which included 394 type cultures of Streptomyces and representatives of 14 other actinomycete genera, were studied. Overall similarities of these strains for 139 unit characters were determined by the SSM and SJ coefficients and clustering by the UPGMA algorithm. Test error and overlap between the phena defined were within acceptable limits. Cluster-groups were defined by the SSM coefficient at the 70.1% similarity (S) level and by the SJ coefficient at the 50% S-level. Clusters were distinguished at the 77.5% SSM and 63% SJ S-levels. Groupings obtained with the two coefficients were generally similar, but there were some changes in the definition and membership of cluster-groups and clusters. The phenetic data obtained, together with those from previous diverse studies, indicated that the genera Actinopycnidium, Actinosporangium, Chainia, Elytrosporangium, Kitasatoa and Microellobosporia should be reduced to synonyms of Streptomyces, while Intrasporangium, Nocardioides and Streptoverticillium remained as distinct genera in the family Streptomycetaceae. Nocardiopsis dassonvillei also showed strong phenetic affinity to Streptomyces, despite its chemotaxonomic differences. Actinomadura sensu stricto was phenetically distinguishable from Streptomyces and 'Nocardia' mediterranea was recognized as a taxon distinct from both these genera and from Nocardia sensu stricto. Most of the Streptomyces type cultures fell into one large cluster-group. At the 77.5% SSM S-level, they were recovered in 19 major and 40 minor clusters, with 18 strains recovered as single member clusters. The status of the latter as species was therefore confirmed. Most of the minor clusters, consisting of two to five strains, can also be regarded as species. The major clusters varied in size (from 6 to 71 strains) and in there homogeneity. Therefore, it is suggested that they be regarded as species-groups until further information is available. The results provide a basis for the reduction of the large number of Streptomyces species which have been described. They also demonstrate that the previous use of a limited number of subjectively chosen characters to define species-groups or species has resulted in artificial classifications.

Actinoplanetes in soil and on plant litter from freshwater habitats

An isolation method for actinoplanetes is described which uses the ability of the sporangium to withstand desiccation and release motile spores when subsequently rehydrated. The desiccation stage reduces the number of associated Gram negative bacteria which cause problems when attempts are made to isolate species on agar plates from natural substrates. The method has enabled the isolation of actinoplanetes directly from soil and plant litter and indirectly from soil with the aid of baits such as pollen and hair. Actinoplanetes appear to be common in dry soils collected from arid areas and sand dune systems. They are normally present on leaves submerged for a time in rivers, streams and lakes and subsequently deposited in heaps on shores or as debris on overhanging vegetation. An actinomycete resembling the ‘spore‐dome’ organism recovered from leaves and twigs by Willoughby (1969) was frequently isolated during the course of these studies. Preliminary work suggests that different species can be recognized and could constitute a new genus within the family Streptomycetaceae.

Biochemical and molecular genetic evidence for a transfer of Actinoplanes armeniacus into the family Streptomycetaceae

Summary Fatty acid and menaquinone patterns as well as the sugar composition and the presence of L,L-diaminopimelic acid in cells of Actinoplanes armeniacus indicate a closer relatedness of this species to members of Streptomycetaceae than to those of Actinoplanaceae . This is further supported by the sensitivity of A. armeniacus to polyvalent Streptomyces - und Kitasatoa-phages . DNA-DNA reassociation studies reveal a definitely higher DNA homology of A. armeniacus to representatives of various streptomycete genera than to those of Actinoplanes and related genera. The reassociation data, however, do not allow unambigous allocation of this species to one of the described genera of Streptomycetaceae .

The occurrence of streptomycin-phosphorylating enzymes in streptomycin-producing streptomycetes.

The occurrence of streptomycin-phosphorylating enzymes in streptomycin-producing streptomycetes.

Nocardioides, a New Genus of the Order Actinomycetales

The properties of 17 strains of a nocardioform actinomycete isolated from soil are described. The hyphae of the primary mycelium of this organism fragment into irregular to rod- to coccus-like elements. The hyphae of the aerial mycelium fragment into rod- to coccus-like elements with smooth surfaces. These elements give rise to new mycelia. The organism is a gram-positive, non-acid-fast, aerobic, mesophile, and it has a cell wall composition of type I (LL-diaminopimelic acid, alanine, glutamic acid, glycine). The deoxyribonucleic acid base composition is 66.5 mol% G+C. The actinomycete is susceptible to phages of a taxon-specific set. Polyvalent Nocardia and Streptomyces phages are not propagated in the nocardioform organism, which is here regarded as belonging to a new genus, Nocardioides, the type species of which is N. albus. The type strain of N. albus is IMET 7807 (Culture Collection of the Zentralinstitut für Microbiologie und experimentelle Therapie, Jena). It has been deposited in the American Type Culture Collection under the number 27980. The new genus is placed in the family Streptomycetaceae.

Atlas of Spores of Selected Genera and Species of Streptomycetaceae

Atlas of Spores of Selected Genera and Species of Streptomycetaceae

Atlas of Spores of Selected Genera and Species of Streptomycetaceae

Atlas of Spores of Selected Genera and Species of Streptomycetaceae

Studies on the Corrinoids and Porphyrins in Streptomycetes

Studies on the Corrinoids and Porphyrins in Streptomycetes