Isolation of Antibacterial Depside Constituents from Indonesian Folious Lichen, Candelaria fibrosa

There is an urgent need for novel drug leads, especially for microbial infections due to continuing emergence of drug resistance. Natural products are the backbone of modern medicine and the lichens have an important role to play in the discovery of novel drugs. Indonesia is gifted with a diverse array of lichens, which remain underexplored for medicinal applications. In this study, we have collected a lichen, Candelaria fibrosa, and conducted phytochemical and bioactivity studies. Using high performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance spectroscopy, we have isolated and characterised two depside compounds, atraric acid (7) and methyl 3-hydroxy orsellinate (8). These two depsides were reported from this lichen species for the first time. The evaluation of the crude methanol extract against Gram-positive bacteria, Staphylococcus aureus, indicated insignificant activity. However, the isolated compounds have been previously reported to possess low antimicrobial activity against common pathogenic bacteria (Staphylococcus aureus, Bacillus cereus and Pseudomonas aeruginosa) but to show significant anti-legionellosis

Isolation of Antibacterial Depside Constituents from Indonesian Folious Lichen, Candelaria fibrosa

There is an urgent need for novel drug leads, especially for microbial infections due to continuing emergence of drug resistance. Natural products are the backbone of modern medicine and the lichens have an important role to play in the discovery of novel drugs. Indonesia is gifted with a diverse array of lichens, which remain underexplored for medicinal applications. In this study, we have collected a lichen, Candelaria fibrosa, and conducted phytochemical and bioactivity studies. Using high performance liquid chromatography, mass spectrometry, and nuclear magnetic resonance spectroscopy, we have isolated and characterised two depside compounds, atraric acid (7) and methyl 3-hydroxy orsellinate (8). These two depsides were reported from this lichen species for the first time. The evaluation of the crude methanol extract against Gram-positive bacteria, Staphylococcus aureus, indicated insignificant activity. However, the isolated compounds have been previously reported to possess low antimicrobial activity against common pathogenic bacteria (Staphylococcus aureus, Bacillus cereus and Pseudomonas aeruginosa) but to show significant anti-legionellosis

Anticancer activity of Indonesian Melia azedarach L.: Phyto-chemistry, in vitro and in silico studies

This study describes the isolation of bioactive compounds and their in vitro anticancer activities from Melia azedarach L leaves from Karanglor, Karangan, Karanganom Klaten, Central Java-Indonesia. Isolated and characterised were the phenolics, kaempferol 7-O-rutinoside 1 and 4-methoxyresorcinol 3, The anticancer activity of the crude methanol extract of M. azedarach against a number cell lines (LNCaP, MDA-MB-231, and MCF-7) was found to be moderate; kaempferol derivatives were notable for their antiproliferative activities. Computational analysis, including molecular docking simulations and molecular dynamic studies, were used to investigate the feasibility of radiolabelled versions of 1 and 3 as theranostic agents targeting tyrosine kinase-type cell surface receptor HER2 in cancer - the iodinated derivatives 2 and 4, respectively, were used in this investigation as surrogates. The corresponding radioiodinated 2 and 4 were found to have high binding affinities of 10.1 and 5.7 kcal/mol, respectively, and have a good stability on the receptor

Indonesian marine and its medicinal contribution

The archipelagic country of Indonesia is populated by the densest marine biodiversity in the world which has created strong global interest and is valued by both Indigenous and European settlements for different purposes. Nearly 1000 chemicals have been extracted and identified. In this review, a systematic data curation was employed to collate bioprospecting related manuscripts providing a comprehensive directory based on publications from 1988 to 2022. Findings with significant pharmacological activities are further discussed through a scoping data collection. This review discusses macroorganisms (Sponges, Ascidian, Gorgonians, Algae, Mangrove) and microorganism (Bacteria and Fungi) and highlights significant discoveries, including a potent microtubule stabilizer laulimalide from Hyattella sp., a prospective doxorubicin complement papuamine alkaloid from Neopetrosia cf exigua, potent antiplasmodial manzamine A from Acanthostrongylophora ingens, the highly potent anti trypanosomal manadoperoxide B from Plakortis cfr. Simplex, mRNA translation disrupter hippuristanol from Briareum sp, and the anti-HIV-1 (+)-8-hydroxymanzamine A isolated from Acanthostrongylophora sp. Further, some potent antibacterial extracts were also found from a limited biomass of bacteria cultures. Although there are currently no examples of commercial drugs from the Indonesian marine environment, this review shows the molecular diversity present and with the known understudied biodiversity, reveals great promise for future studies and outcomes. Graphical Abstract: [Figure not available: see fulltext.