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Anti-Infective Agents

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ISSN (Print): 2211-3525
ISSN (Online): 2211-3533

Research Article

Bioprospecting Antibacterial Properties of Fungi Isolated from Kakinada Sea Coast and Eucalyptus Foliage

In Press, (this is not the final "Version of Record"). Available online 22 May, 2024
Author(s): Prathyash Ushus Mancheary John*, Siva Kumar Kandula*, Shilpa Valiyaparambil, Muddukrishnaiah Kotakonda, Sirajudheen Mukriyan Kallungal, Bharathi Periyasamy, Koteswari Peddi, Venkata Satya Mahesh Kumar Metta and Satyanarayana Swamy Cheekatla
Published on: 22 May, 2024

Article ID: e220524230217

DOI: 10.2174/0122113525315717240513051550

Price: $95

Abstract

Background: Fungi produce a wide range of secondary metabolites with bactericidal or bacteriostatic properties. In search of novel antibacterial compounds recently, many fungi of marine and plant origin have been studied for their antimicrobial properties.

Aims: This work aimed to study bio-prospect marine and endophytic fungi for their antibacterial properties.

Methods: Intensive microbiological methods were followed for isolation, differential growth, and qualitative screening of enzyme production. The isolates were characterised and identified based on morpho-taxonomy, 18S rRNA gene sequencing, and phylogenetic analysis of the tar-get genes. The antimicrobial activity of fungal ethyl acetate extracts against S. aureus, B. sub-tilis, and E. coli was evaluated using a well-diffusion method, and MIC was determined by the microdilution method. Cell lysis was observed through Transmission Electron Microscopy.

Results: A BLAST search of 18S rRNA gene sequences of the marine isolates GSBT S13 and GSBT S14 showed 99.3 % sequence similarity with A. glaucus for both isolates and that of endophyte GSBT E3 showed 99.7 % sequence similarity with B. pinkertoniae. Cellulase pro-duction was comparatively higher in GSBT E3 and lipase from GSBT S13 and GSBT S14. Ethyl acetate extracts of GSBT S14 and GSBT E3 showed a clear zone of inhibition by the well-diffusion method, further confirmed by electron microscopy. HR-TEM showed that the ethyl acetate extracts of the isolates appeared to damage the cell membrane, leading to cell shrinkage and death in E. coli and S. aureus.

Conclusion: GSBT S13 and GSBT S14 exhibited extracellular amylase, cellulase, and lipase activities. Ethyl acetate extracts of both GSBT S14 and B. pinkertoniae GSBT E3 showed better antibacterial properties against S. aureus.

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