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Genome plasticity in Streptomyces: identification of 1 Mb TIRs in the S. coelicolor A3(2) chromosome

ABSTRACT: The chromosomes of several widely used laboratory derivatives of Streptomyces coelicolor A3(2) were found to have 1.06 Mb inverted repeat sequences at their termini (i.e. long-terminal inverted repeats; L-TIRs), which are 50 times the length of the 22 kb TIRs of the sequenced S. coelicolor strain M145. The L-TIRs include 1005 annotated genes and increase the overall chromosome size to 9.7 Mb. The 1.06 Mb L-TIRs are the longest reported thus far for an actinomycete, and are proposed to represent the chromosomal state of the original soil isolate of S. coelicolor A3(2). S. coelicolor A3(2), M600 and J1501 possess L-TIRs, whereas approximately half the examined early mutants of A3(2) generated by ultraviolet (UV) or X-ray mutagenesis have truncated their TIRs to the 22 kb length. UV radiation was found to stimulate L-TIR truncation. Two copies of a transposase gene (SCO0020) flank 1.04 Mb of DNA in the right L-TIR, and recombination between them appears to generate strains containing short TIRs. This TIR reduction mechanism may represent a general strategy by which transposable elements can modulate the structure of chromosome ends. The presence of L-TIRs in certain S. coelicolor strains represents a major chromosomal alteration in strains previously thought to be genetically similar. A dose response design type examines the relationship between the size of the administered dose and the extent of the response of the organism(s). Keywords: dose_response_design

ORGANISM(S): Streptomyces coelicolor

PROVIDER: GSE2994 | GEO | 2005/07/26

SECONDARY ACCESSION(S): PRJNA91949

REPOSITORIES: GEO

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Comparative genomic hybridization Streptomyces coelicolor A3(2) strains

Project description:The chromosomes of several widely used laboratory derivatives of Streptomyces coelicolor A3(2) were found to have 1.06 Mb inverted repeat sequences at their termini (i.e. long-terminal inverted repeats; L-TIRs), which are 50 times the length of the 22 kb TIRs of the sequenced S. coelicolor strain M145. The L-TIRs include 1005 annotated genes and increase the overall chromosome size to 9.7 Mb. The 1.06 Mb L-TIRs are the longest reported thus far for an actinomycete, and are proposed to represent the chromosomal state of the original soil isolate of S. coelicolor A3(2). S. coelicolor A3(2), M600 and J1501 possess L-TIRs, whereas approximately half the examined early mutants of A3(2) generated by ultraviolet (UV) or X-ray mutagenesis have truncated their TIRs to the 22 kb length. UV radiation was found to stimulate L-TIR truncation. Two copies of a transposase gene (SCO0020) flank 1.04 Mb of DNA in the right L-TIR, and recombination between them appears to generate strains containing short TIRs. This TIR reduction mechanism may represent a general strategy by which transposable elements can modulate the structure of chromosome ends. The presence of L-TIRs in certain S. coelicolor strains represents a major chromosomal alteration in strains previously thought to be genetically similar.

2005-07-21 | E-SMDB-2740 | biostudies-arrayexpress

Genome plasticity in Streptomyces: identification of 1 Mb TIRs in the S. coelicolor A3(2) chromosome

2005-07-26 | E-GEOD-2994 | biostudies-arrayexpress

Streptomyces coelicolor

Project description:Genome plasticity in Streptomyces: identification of 1 Mb TIRs in the S. coelicolor A3(2) chromosome

| PRJNA91949 | ENA

Streptomyces coelicolor A3(2) Timecourse Proteomics

Project description:Streptomyces coelicolor A3(2) shotgun proteomics. S. coelicolor A3(2) was fermented in GYM.

2022-03-23 | MSV000089111 | MassIVE

Microbial Toll/interleukin-1 domain NADase activities

Project description:Recent work indicates that Toll/Interleukin-1 receptor (TIR) domain-containing proteins degrade NAD. Given increasing attention to how the gut microbiome contributes to NAD metabolism and healthy growth, we examined the representation and expressed NADase activities of its TIR domains. The NADase activities of 151 bacterial TIRs were characterized in vitro. Gut bacterial strains representing the diversity of TIRs observed in the microbiome, and activities observed in vitro, were introduced into germ-free mice fed defined diets. Mass spectrometry of cecal metabolites disclosed that a product of TIR NADase activity, variant cyclic-ADPR-x, distinguished colonized from germ-free animals. Mass spectrometry and microbial RNA-Seq of gnotobiotic mice colonized with one, two and all members of this bacterial consortium, identified Bacteroides xylanisolvens as the principal in vivo source of v-cADPR-x. Guided by bioinformatic analyses of biochemically validated TIR domains, we determined that compared to age-matched healthy Bangladeshi children, those with acute malnutrition had significantly lower fecal levels of TIRs known or predicted to generate v-cADPR-x, and of this metabolite. These results indicate that v-cADPR-x may be an informative biomarker of healthy gut microbiome development.

2022-03-22 | ST002117 | MetabolomicsWorkbench

Reverse engineering of industrial pharmaceutical-producing actinomycete strains

Project description:Abstract: Transcript levels in production cultures of wildtype and classically improved strains of the actinomycete bacteria Saccharopolyspora erythraea and Streptomyces fradiae were monitored using microarrays of the sequenced actinomycete S. coelicolor. Sac. erythraea and S. fradiae synthesize the polyketide antibiotics erythromycin and tylosin, respectively, and the classically improved strains contain unknown overproduction mutations. The Sac. erythraea overproducer was found to express the entire 56-kb erythromycin gene cluster several days longer than the wildtype strain. In contrast, the S. fradiae wildtype and overproducer strains expressed the 85-kb tylosin biosynthetic gene cluster similarly, while they expressed several tens of other S. fradiae genes and S. coelicolor homologs differently, including the acyl-CoA dehydrogenase gene aco and the S. coelicolor isobutyryl-CoA mutase homolog icmA. These observations indicated that overproduction mechanisms in classically improved strains can affect both the timing and rate of antibiotic synthesis, and alter the regulation of antibiotic biosynthetic enzymes and enzymes involved in precursor metabolism. This SuperSeries is composed of the SubSeries listed below.

2006-03-08 | GSE4395 | GEO

Genomic Comparison of the O-antigen Biosynthesis Gene Clusters of E. coli O55 Strains Belonging to Three Lineages.

Project description:Typical enteropathogenic Escherichia coli (EPEC) O55:H7 is regarded as the closest relative of enterohemorrhagic E. coli (EHEC) O157:H7. Both serotypes usually express the γ1 intimin subclass and trigger actin polymerazation by the Tir-TccP pathway. However, atypical O55:H7 strains capable of triggering actin polymerization via the Tir-Nck pathway have recently been identified. In this study, we investigated the genotypic differences and phylogenetic relationships between typical and atypical O55:H7 strains. We show that the atypical O55:H7 strains, which express the θ intimin subclass and lack both tccP and tccP2, belong to an E. coli lineage distinct from the typical O55:H7 and from the EPEC O55:H6, which also uses the Tir-Nck actin polymerization pathway. We conducted genomic comparisons of the chromosomal regions covering the O-antigen gene cluster and its flanking regions between the three O55 lineages by restriction fragment length polymorphism analysis of PCR products and DNA sequencing analysis of about 65-kb chromosomal regions. This unexpectedly revealed that horizontal transfer of large fragments (≥ 40 kb) encoding the O55-antigen gene cluster and part of neighboring colanic acid gene cluster is involved in the emergence of the three O55 E. coli lineages. The data provide new insights into the mechanisms involved in the generation of a wide variety of O-serotypes in Gram-negative bacteria. Keywords: comparative genomic hybridization

2008-04-01 | GSE8889 | GEO

Reverse engineering of industrial pharmaceutical-producing actinomycete strains

2006-03-08 | E-GEOD-4395 | biostudies-arrayexpress

Translatome analysis by Polysome profiling of Streptomyces coelicolor A3(2) cold-shock response

Project description:Polysome profiling analysis of wild type prototrophic Streptomyces coelicolor A3(2) MT1110 strain to examine global translational vs transcriptional profile change when exposed to cold shock from 30°C to 10°C in minimal liquid medium.

2024-02-22 | GSE229820 | GEO

Translatome analysis by Ribosome profiling of Streptomyces coelicolor A3(2) cold-shock response

Project description:Ribosome profiling analysis of wild type prototrophic Streptomyces coelicolor A3(2) MT1110 strain to examine global translational vs transcriptional profile change when exposed to cold shock from 30°C to 10°C in minimal liquid medium.

2024-02-22 | GSE230542 | GEO

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