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Streptomyces antibioticus

ABSTRACT: Streptomyces antibioticus overview

PROVIDER: PRJNA291454 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	DRR017878.fastq.gz	Fastqsanger.gz

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relA is required for actinomycin production in Streptomyces antibioticus.

Project description:The relA gene from Streptomyces antibioticus has been cloned and sequenced. The gene encodes a protein with an Mr of 93,653, which is 91% identical to the corresponding protein from Streptomyces coelicolor. Disruption of S. antibioticus relA produces a strain which grows significantly more slowly on actinomycin production medium than the wild type or a disruptant to which the intact relA gene was restored. Moreover, the disruptant was unable to accumulate ppGpp to the levels observed during the normal course of growth and actinomycin production in the wild type. The strain containing the disrupted relA gene did not produce actinomycin and contained significantly lower levels of the enzyme phenoxazinone synthase than the wild-type strain. Actinomycin synthetase I, a key enzyme in the actinomycin biosynthetic pathway, was undetectable in the relA disruptant. Growth of the disruptant on low-phosphate medium did not restore actinomycin production.

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Nematicidal potential of Streptomyces antibioticus strain M7 against Meloidogyne incognita.

Project description:Meloidogyne spp. are microscopic, obligatory endoparasites with worldwide distribution which cause severe damage to agricultural crops. The present study revealed the nematicidal activity of Streptomyces antibioticus strain M7 against Meloidogyne incognita. The culture supernatant of the isolate caused 100% J2 mortality after 24 h and inhibited egg hatching (only 3%). In addition, the nematicidal activity of actinomycins V, X2 and D purified from strain M7 was also checked. In vitro studies displayed 97.0-99.0% juvenile mortality and 28.0-44.0% egg hatching after 168 h at 240 µg/ml of actinomycin, with LD50 (lethal dose) values of 28-120 µg/ml. In vivo study further validated the nematicidal activity of strain M7, where nematode infested tomato plants treated with culture supernatant/cells/solvent extract showed reduction in root galls and egg masses per plant by 50.0-62.06% and 53.48-76.74%, respectively, and significantly enhanced the shoot length (54.67-76.39%), root length (36.45-64.88%), shoot fresh weight (111-171.77%), root fresh weight (120-163.33%), shoot dry weight (54.45-145.45%), and root dry weight (100-133.3%) over the nematode infested plants treated with water. Furthermore, tomato plants treated with cells/culture supernatant/extract of strain M7 without nematode infestation also showed significant increase in various plant growth parameters. Thus, the outcome of the study revealed the potential of S. antibioticus strain M7 and actinomycins produced from it to be developed as safe nematicidal agents to control the root knot nematodes, and to increase the crop yield.

| S-EPMC6805829 | biostudies-literature

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