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This problem steered many researchers in their quest to discover new effective antimicrobial agents from natural origins including plants or their residing endophytes. In this work, we aimed to identify the endophytic fungi derived from <jats:italic>Hedera helix<\/jats:italic> L. and investigate their potential antimicrobial activity. Bioguided fractionation approach was conducted to isolate the pure compounds from the most active fungal fraction. Out of a total of six different isolated endophytic fungal strains, only <jats:italic>Aspergillus cejpii<\/jats:italic> showed the highest activity against all tested microbial strains. The most active fraction was the dichloromethane\/methanol fraction (DCM:MeOH), where it showed significant activity against <jats:italic>Escherichia coli<\/jats:italic>, <jats:italic>Pseudomonas aeruginosa<\/jats:italic>, <jats:italic>Staphylococcus aureus<\/jats:italic>, <jats:italic>Serratia marcescens<\/jats:italic>, <jats:italic>Acinetobacter baumannii<\/jats:italic>, <jats:italic>Salmonella typhi<\/jats:italic>, and three drug-resistant clinical isolate strains including Methicillin-resistant <jats:italic>Staphylococcus aureus<\/jats:italic> (MRSA, H1), <jats:italic>Pseudomonas aeruginosa<\/jats:italic> (PS 16), and <jats:italic>Acinetobacter baumannii<\/jats:italic> (ACT 322) using tetracyline and kanamycin as the control antibiotics. Bioguided fractionation of the active fraction led to the isolation of the <jats:italic>\u03b3<\/jats:italic>-butenolide, spiculisporic acid. Structure elucidation was carried out using <jats:sup>1<\/jats:sup>H and <jats:sup>13<\/jats:sup>C-NMR spectroscopic analysis. The compound showed good antimicrobial activities with minimum inhibitory concentration (MIC) values ranging from 3.9 to 31.25 \u03bcg\/mL against all tested strains. Gas chromatography coupled to mass spectrometry (GC-MS) profiling was also carried out to identify the metabolites in the microbial crude extract. In conclusion, endophytic fungi, <jats:italic>Aspergillus cejpii<\/jats:italic>, isolated from <jats:italic>Hedera helix<\/jats:italic> L. roots showed promising antimicrobial activity which merits further in-depth investigations for potential utilization as a source of new antibiotics in the future. It can also be considered as a novel source for spiculisporic acid.<\/jats:p>","DOI":"10.1007\/s42770-023-01224-7","type":"journal-article","created":{"date-parts":[[2024,1,17]],"date-time":"2024-01-17T07:02:45Z","timestamp":1705474965000},"page":"515-527","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Antimicrobial activity of spiculisporic acid isolated from endophytic fungus Aspergillus cejpii of Hedera helix against MRSA"],"prefix":"10.1007","volume":"55","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0485-9993","authenticated-orcid":false,"given":"Sarah","family":"Osama","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Moshera","family":"El Sherei","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dalia A.","family":"Al-Mahdy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mokhtar","family":"Bishr","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Osama","family":"Salama","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5614-5127","authenticated-orcid":false,"given":"Marwa M.","family":"Raafat","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,1,17]]},"reference":[{"key":"1224_CR1","first-page":"770","volume":"59","author":"B Demirci","year":"2004","unstructured":"Demirci B, Goppel M, Demirci F, Franz G (2004) HPLC profiling and quantification of active principles in leaves of Hedera helix L. 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