ISSN: 0973-7510

E-ISSN: 2581-690X

Research Article | Open Access
Meghana Arivilu1, Shaziya Sulthana1, Vijay Ramesh1, E. Sumitha2 and Sunita C. Mesta1
1Department of Microbiology, School of Life Sciences, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India.
2Department of Biotechnology and Bioinformatics, School of Life Sciences, JSS Academy of Higher Education and Research, Mysuru, Karnataka, India.
Article Number: 11455 | © The Author(s). 2026
J Pure Appl Microbiol. 2026;20(3):2384-2398. https://doi.org/10.22207/JPAM.20.3.32
Received: 16 February 2026 | Accepted: 12 May 2026 | Published online: 22 August 2026
Issue online: September 2026
Abstract

Actinomycetes are filamentous, Gram-positive bacteria of major ecological and biomedical importance due to their exceptional ability to produce diverse bioactive secondary metabolites encoded by numerous biosynthetic gene clusters. In the present study, actinomycetes were isolated from rhizospheric and non-rhizospheric soil samples and systematically characterized using morphological, biochemical, and molecular approaches. The isolates were screened for antimicrobial, antioxidant, and L-glutaminase-producing potential, followed by 16S rRNA gene sequencing for taxonomic identification. Several isolates exhibited strong antibacterial activity against clinically significant pathogens, including Staphylococcus aureus (NCIM 2073) and Escherichia coli (NCTC 9001). Antioxidant potential evaluated using the DPPH radical scavenging assay confirmed the presence of redox-active metabolites. Efficient production of L-glutaminase, an amidohydrolase enzyme was observed. To complement the experimental findings, in silico molecular docking studies were performed to investigate the interaction of selected bioactive compounds with relevant target proteins, providing mechanistic insights into binding affinity and molecular stability. The docking results revealed favourable binding energies and key hydrogen-bond and hydrophobic interactions, supporting the observed biological activities. Overall, the integrated experimental and in silico approach highlights soil-derived actinomycetes as versatile and sustainable bioresources with significant pharmaceutical and biotechnological potential, emphasizing their role in combating antimicrobial resistance and enabling the rational development of novel therapeutic and industrial products.

Keywords

Actinomycetes, L-glutaminase, Antimicrobial Activity, Antioxidant Activity, Molecular Docking, Secondary Metabolites

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© The Author(s) 2026. Open Access. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License which permits unrestricted use, sharing, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.