One step bio-guided isolation of secondary metabolites from the endophytic fungus Penicillium crustosum using high-resolution semi-preparative HPLC

Abdulelah Alfattani; Emerson Ferreira Queiroz; Laurence Marcourt; Sara Leoni; Didier Stien; Valerie Hofstetter; Katia Gindro; Karl Perron; Jean-Luc Wolfender

doi:10.2174/1386207326666230707110651

One step bio-guided isolation of secondary metabolites from the endophytic fungus Penicillium crustosum using high-resolution semi-preparative HPLC

Comb Chem High Throughput Screen. 2023 Jul 7. doi: 10.2174/1386207326666230707110651. Online ahead of print.

Authors

Abdulelah Alfattani^{1

2}, Emerson Ferreira Queiroz^{1

2}, Laurence Marcourt^{1

2}, Sara Leoni³, Didier Stien⁴, Valerie Hofstetter⁵, Katia Gindro⁵, Karl Perron³, Jean-Luc Wolfender^{1

2}

Affiliations

¹ School of Pharmaceutical Sciences, University of Geneva, CMU, Geneva, Switzerland.
² Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, Geneva, Switzerland.
³ Microbiological Analysis Platform, Microbiology Unit, Department of Botany and Plant Biology, University of Geneva, CH-1211 Geneva 4, Switzerland.
⁴ Sorbonne Université, CNRS, Laboratoire de Biodiversité et Biotechnologie Microbiennes, LBBM, Observatoire Océanologique, Banyuls-Sur-Mer, France.
⁵ Agroscope, Plant Protection Research Division, Mycology Group, Route de Duillier 50, P.O. Box 1012, 1260 Nyon, Switzerland.

PMID: 37424340
DOI: 10.2174/1386207326666230707110651

Abstract

Background: An endophytic fungal strain Penicillium crustosum was isolated from the seagrass Posidonia oceanica and investigated to identify its antimicrobial constituents and characterize its metabolome composition. The ethyl acetate extract of this fungus exhibited antimicrobial activity against methicillin-resistant Staphylococcus aureus (MRSA) as well as an anti-quorum sensing effect against Pseudomonas aeruginosa.

Methods: The crude extract was profiled by UHPLC-HRMS/MS and the dereplication was assisted by feature-based molecular networking. As a result, more than twenty compounds were annotated in this fungus. To rapidly identify the active compounds, the enriched extract was fractionated by semi-preparative HPLC-UV applying a chromatographic gradient transfer and dry load sample introduction to maximise resolution. The collected fractions were profiled by 1H-NMR and UHPLC-HRMS.

Results: The use of molecular networking-assisted UHPLC-HRMS/MS dereplication allowed preliminary identification of over 20 compounds present in the ethyl acetate extract of P. crustosum. The chromatographic approach significantly accelerated the isolation of the majority of compounds present in the active extract. The one-step fractionation allowed the isolation and identification of eight compounds (1-8).

Conclusion: This study led to the unambiguous identification of eight known secondary metabolites as well as the determination of their antibacterial properties.

Keywords: Penicillium crustosum; Posidonia oceanica; UHPLC-HRMS/MS molecular networking; anti-quorum sensing assays.; antibacterial natural products; fungal endophytes; high-resolution semi-preparative HPLC.