scholarly journals Homologous expression of lysA encoding diaminopimelic acid (DAP) decarboxylase reveals increased antibiotic production in Streptomyces clavuligerus

2019 ◽  
Vol 51 (2) ◽  
pp. 547-556
Author(s):  
Çiğdem Otur ◽  
Aslıhan Kurt-Kızıldoğan
Keyword(s):  
Antibiotic Production ◽  
Streptomyces Clavuligerus ◽  
Diaminopimelic Acid ◽  
Homologous Expression

Nitrogen nutrition and regulation of cephalosporin production in Streptomyces clavuligerus

1979 ◽  
Vol 25 (1) ◽  
pp. 61-67 ◽  
Author(s):  
Yair Aharonowitz ◽  
Arnold L. Demain
Keyword(s):  
Amino Acids ◽  
Growth Rate ◽  
Nitrogen Nutrition ◽  
Antibiotic Production ◽  
Inorganic Nitrogen ◽  
Amino Nitrogen ◽  
Nitrogen Sources ◽  
Streptomyces Clavuligerus ◽  
Defined Medium ◽  
Repressive Effect

When used as sole nitrogen source, certain amino acids (e.g., proline, asparagine) supported both growth and sporulation by Streptomyces clavuligerus streaked onto solid defined medium. Ammonium supported growth but suppressed sporulation. Amino nitrogen was best for cephalosporin production in liquid defined medium, although urea was almost as useful. A comparison of amino acids showed asparagine and glutamine to be the best nitrogen sources and arginine to be almost as good. Ammonium salts supported a somewhat lower growth rate than asparagine, but antibiotic production was very poor on these inorganic nitrogen sources. Addition of ammonium to asparagine did not affect growth rate but increased mycelial mass; cephalosporin production was reduced by about 75%. Antibiotic production was more closely associated with growth in the absence of ammonium than in its presence, indicating a strong inhibitory and (or) repressive effect of NH4+ on antibiotic production. Ammonium exerted its negative effect when added at 24 h or earlier, i.e. before antibiotic formation began.

scholarly journals Induction of Holomycin Production and Complex Metabolic Changes by theargRMutation in Streptomyces clavuligerus NP1

2012 ◽  
Vol 78 (9) ◽  
pp. 3431-3441 ◽  
Author(s):  
Hua Yin ◽  
Sihai Xiang ◽  
Jianting Zheng ◽  
Keqiang Fan ◽  
Tingting Yu ◽  
...  
Keyword(s):  
Metabolic Pathways ◽  
Antibiotic Production ◽  
Streptomyces Clavuligerus ◽  
Metabolic Changes ◽  
Primary Metabolism ◽  
Arginine Biosynthesis ◽  
Complex Interplay ◽  
Altered Expression ◽  
Content Type ◽  
Primary And Secondary Metabolism

ABSTRACTIn bacteria, arginine biosynthesis is tightly regulated by a universally conserved regulator, ArgR, which regulates the expression of arginine biosynthetic genes, as well as other important genes. Disruption ofargRinStreptomyces clavuligerusNP1 resulted in complex phenotypic changes in growth and antibiotic production levels. To understand the metabolic changes underlying the phenotypes, comparative proteomic studies were carried out between NP1 and itsargRdisruption mutant (designated CZR). In CZR, enzymes involved in holomycin biosynthesis were overexpressed; this is consistent with its holomycin overproduction phenotype. The effects on clavulanic acid (CA) biosynthesis are more complex. Several proteins from the CA cluster were moderately overexpressed, whereas several proteins from the 5S clavam biosynthetic cluster and from the paralog cluster of CA and 5S clavam biosynthesis were severely downregulated. Obvious changes were also detected in primary metabolism, which are mainly reflected in the altered expression levels of proteins involved in acetyl-coenzyme A (CoA) and cysteine biosynthesis. Since acetyl-CoA and cysteine are precursors for holomycin synthesis, overexpression of these proteins is consistent with the holomycin overproduction phenotype. The complex interplay between primary and secondary metabolism and between secondary metabolic pathways were revealed by these analyses, and the insights will guide further efforts to improve production levels of CA and holomycin inS. clavuligerus.

Potential antibiotic production of Streptomyces justiciae sp. nov., isolated from the root of Justicia subcoriacea

2021 ◽  
Vol 71 (9) ◽  
Author(s):  
Wongsakorn Phongsopitanun ◽  
Pawina Kanchanasin ◽  
Paranee Sripreechasak ◽  
Kanokorn Rueangsawang ◽  
Anan Athipornchai ◽  
...  
Keyword(s):  
Type Strain ◽  
Type Species ◽  
Actinomycin D ◽  
Antibiotic Production ◽  
Morphological Characteristics ◽  
Diaminopimelic Acid ◽  
Rrna Gene ◽  
Content Type ◽  
Link Type ◽  
Gene Similarity

Endophytic actinobacterial strain 3R004T was isolated from a root of Justicia subcoriacea collected in Thailand. In this report, the taxonomic position of this strain is described using a polyphasic approach. Based on the morphological characteristics and chemical composition of its cells, strain 3R004T was identified as a member of the genus Streptomyces . It produced a long chain of cylindrical spores on aerial mycelia. ll-Diaminopimelic acid was detected in the cell wall peptidoglycan. The menaquinones were MK-9(H4), MK-9(H6) and MK-9(H8). C16 : 0, iso-C16 : 0, anteiso-C15 : 0 and iso-C15 : 0 were detected as the major cellular fatty acids. Polar lipids were diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol, phosphatidylinositol and one unidentified lipid. Strain 3R004T showed the highest 16S rRNA gene similarity of 99.45 % to Streptomyces cyaneochromogenes MK-45T. The phylogenomic results indicated that strain 3R004T was close to Streptomyces aquilus GGCR-6T and Streptomyces antibioticus DSM 40234T. The DNA–DNA hybridization and average nucleotide identity values among strain 3R004T and closely related Streptomyces species were 35.5–63.1 % and 82.7–94.3 %, respectively. The type strain produced actinomycin D antibiotic as the major secondary metabolite. The maximum productivity of the actinomycin D (378 mg l−1) was observed when the strain was grown in 301 broth at 30 °C, 180 r.p.m. for 12 days. On the basis of phenotypic and genotypic evidence, strain 3R004T represents a novel species of the genus Streptomyces , for which the name Streptomyces justiciae is proposed. The type strain is 3R004T (=LMG 32138T=TBRC 13128T=NBRC 115065T).

scholarly journals Streptomyces olivicoloratus sp. nov., an antibiotic-producing bacterium isolated from soil

2015 ◽  
Vol 65 (Pt_10) ◽  
pp. 3262-3270 ◽  
Author(s):  
Tuan Manh Nguyen ◽  
Jaisoo Kim
Keyword(s):  
Staphylococcus Epidermidis ◽  
Dna Hybridization ◽  
Gene Sequence ◽  
Antibiotic Production ◽  
Sequence Similarity ◽  
Diaminopimelic Acid ◽  
Rrna Gene ◽  
Malt Extract ◽  
Polar Lipid Profile ◽  
Biochemical Analyses

Strain T13T, isolated from forest soil in Jeollabuk-do, South Korea, exhibited antibiotic production on yeast extract-malt extract-glucose (YMG) medium containing magnesium chloride as a trace mineral, and inhibited the growth of Bacillus subtilis, Staphylococcus aureus, Pseudomonas aeruginosa, Staphylococcus epidermidis, Paenibacillus larvae, Escherichia coli, Candida albicans and Aspergillus niger. Growth occurred at 15–45 °C, pH 4–11 and in the presence of up to 2 % (w/v) NaCl. Biochemical analyses indicated that the predominant menaquinones produced by this strain were MK-9(H6) and MK-9(H8); small amounts of MK-10(H2) and MK-10(H4) were also detected. The polar lipid profile comprised diphosphatidylglycerol, phosphatidylethanolamine and phosphatidylcholine, and the cell-wall peptidoglycan contained ll-diaminopimelic acid, glutamic acid, alanine and glycine. Whole-cell hydrolysates contained glucose, galactose, ribose and rhamnose. The fatty-acid profile of strain T13T was made up predominantly of iso- and anteiso-branched fatty acids. Genetic analyses demonstrated that strain T13T is closely related to Streptomyces gramineus JR-43T (98.29 % 16S rRNA gene sequence similarity), S. graminisoli JR-19T (97.99 %), S. rhizophilus JR-41T (97.86 %), S. longwoodensis LMG 20096T (97.84 %), S. graminifolii JL-22T (97.79 %) and S. yaanensis Z4T (97.56 %), and DNA–DNA hybridization yielded relatedness values of 35.27–43.42 % when T13T was compared to related strains. The results of morphological, chemotaxonomic, phylogenetic and phenotypic analyses confirm that this strain represents a novel species of the genus Streptomyces, for which the name Streptomyces olivicoloratus sp. nov. is proposed. The type strain is T13T ( = KEMB 9005-210T = KACC 18227T = NBRC 110901T).

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