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Biosynthesis and characterization of yellow pigment from Aspergillus nidulans strain JAS3 isolated from Thirumullavaram, Indian Ocean and its therapeutic activity against clinical pathogens

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Abstract

Fungi have emerged as a key source of natural products, despite the prevalence of various other microbial phyla in the marine ecosystem. They are increasingly being used for pigment production. The current study was performed to screen for a potential pigmented fungal strain isolated from Thirumullavaram, Kollam, Indian Ocean, followed by its extraction, characterization and antagonistic activity against clinical pathogens. Strain JAS3 was found to produce pale-yellow color pigment (UA 11.5 ± 0.5 g/L) when subjected to submerged fermentation in the optimized Czapek Dox medium at 28 ± 2 °C. Pigment extraction was performed using liquid–liquid separation with methanol as the solvent. Lambda max for the pigment was read at 430 nm. Biological and chemical characterization performed using thin layer chromatography, UV–Visible spectrophotometry, Fourier Transfer Infrared, Nuclear Magnetic Resonance and Gas chromatography-mass spectroscopy, confirmed the presence of many bioactive compounds responsible for the therapeutic activity of the pigment. Yeast cytotoxicity and phytotoxicity tests were performed to evaluate pigments' toxicity. Furthermore, the potential strain was identified and designated as Aspergillus nidulans strain JAS3 (accession no: MZ713409.1) using conventional and molecular techniques. To date, there are no such reports of colored bioactive metabolite extraction, purification and characterization from Aspergillus nidulans from Kollam, Indian Ocean. The colored pigment showed good bioactivity such as antimicrobial, anti-inflammatory, antioxidant, antiproteinase and antifouling activity against various clinical pathogenic strains, thereby proving its therapeutic importance which has not been reported previously. Strain JAS3 can be employed in a variety of pharmaceutical and biotechnology applications as an environmentally safe alternative to synthetic hues.

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Abbreviations

CDA:

Czapek Dox Agar

PDA:

Potato Dextrose Agar

MEA:

Malt Extract Agar

SDA:

Saboraud Dextrose Agar

RBA:

Rose Bengal Agar

LPCB:

Lactophenol Cotton Blue

SEM:

Scanning Electron Microscope

PCR:

Polymerase Chain Reaction

NCBI:

National Centre for Biotechnology Information

CDB:

Czapek Dox Broth

PDB:

Potato Dextrose Broth

SDB:

Saboraud Dextrose Broth

MSG:

Mineral Salt Glucose

DPPH:

1, 1-Diphenyl-2-picryl hydrazyl

MIC:

Minimum Inhibitory Concentration;

TPC:

Total phenolic content

TLC:

Thin layer chromatography

Rf :

Retention factor

GC-MS:

Gas chromatography-mass spectrometry

FTIR:

Fourier Transform Infrared

NMR:

Nuclear Magnetic Resonance

YPD:

Yeast extract, Peptone and Dextrose

BSA:

Bovine Serum Albumin

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Acknowledgements

The authors would like to express their gratitude to the management of VIT, Vellore.

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Soumya Nair: Review of literature, Investigation, Methodology, Data curation, Writing- Original draft preparation, Editing.

Jayanthi Abraham*: Conceptualization. Methodology, Supervision, Validation, Reviewing, Approving final manuscript.

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Correspondence to Jayanthi Abraham.

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Nair, S., Abraham, J. Biosynthesis and characterization of yellow pigment from Aspergillus nidulans strain JAS3 isolated from Thirumullavaram, Indian Ocean and its therapeutic activity against clinical pathogens. Biologia 78, 1171–1185 (2023). https://doi.org/10.1007/s11756-023-01337-2

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  • DOI: https://doi.org/10.1007/s11756-023-01337-2

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