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2000
Volume 21, Issue 7
  • ISSN: 1573-4099
  • E-ISSN: 1875-6697

Abstract

Background

Marine sediment bacteria have been generating considerable attention lately due to their potential as valuable reservoirs of novel antimicrobial agents.

Aim

In vitro and antibacterial activities of antibacterial compounds isolated from the marine sediment bacterium (S-2).

Methods

Coastal sediment samples were collected from Rameswaram, Ramnathapuram District, Tamil Nadu, India. Bacteria were isolated using the crowded plate method, and their phenotypic and genotypic characteristics were studied. Purified bacteria were cultured in large volumes, secondary metabolites were extracted, and novel antibacterial agents were isolated from the aqueous extract. Novel compound antibacterial activity was studied through and . The mechanism activity of antibacterial activity was confirmed by a high-resolution transmission electron microscope.

Results

Genotypic analysis confirmed that the isolated S-2 bacteria were , and the aqueous extract showed antibacterial activity against (17 mm zone of inhibition) and (12 mm zone of inhibition). A bioactive molecule, 13-hydroxy-9-(1-hydroxyethyl)-11-methoxy-2,4dioxapentacyclo[10.7.1.03,7.08,20.014,19]icosa-1(20),5,7,12,14(19), 16-hexane-18-one, was isolated from aqueous extracts of the S-2 bacterium. Chromatography and spectroscopic analysis confirmed the identity of the isolated compound. Novel compound potential antibacterial activity showing against (18 mm zone of inhibition) and MIC 250 µg/mL, which was confirmed by tetrazolium staining. The antibacterial activity mechanism was confirmed by transmission electron microscopy. Molecular docking studies show good binding (-9.9 kcal/mol) of the compound with 3U2D, while molecular dynamic simulation studies confirm the conformationally stable structure of the complex between 3U2D and 13-hydroxy-9-(1-hydroxyethyl)-11-methoxy-2,4-dioxapentacyclo [10.7.1.03, 7.08,20.014,19]icosa-1(20),5,7,12,14(19), 16-hexane-18-one. It has been observed from the docking study of 3U2D with standard drug ciprofloxacin that the lower affinity is compared to the test ligand, which has a docking score of 7.3 kcal/mol. Out of interacting residues of protein 3U2D residue, Thr173 and Ile86 formed conventional hydrogen bonds.

Conclusion

Marine bacterium produces a novel antibacterial compound (13-hydroxy-9-(1-hydroxyethyl)-11-methoxy-2,4-dioxapentacyclo[10.7.1.03,7.08,20.014,19]icosa-1(20),5,7,12, 14(19),16-hexane-18-one), which shows antibacterial activity against clinical , confirmed by and analysis. This molecule can used as a lead molecule for antibacterial activity.

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2026-02-01

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The Antibacterial Efficacy of a Compound Extracted from Marine Sediment Bacterium Enterococcus lactis (S-2): A Comparative Analysis Through In-vitro and In-silico Assessments
Curr. Computeraided Drug Des. 21, 972 (2025); https://doi.org/10.2174/0115734099305519240531053135
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  • Article Type:     Research Article
Keyword(s): antibacterial activity; electron microscopy; Enterococcus lactis; Marine sediment; molecular docking; molecular simulation

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