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National Committee on Marine Sciences (NCMS)

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    Total polyphenol content of tropical marine and coastal flora: Potentials for food and nutraceutical applications
    Narvarte, Bienson Ceasar V.; Genovia, Tom Gerald T.; Hinaloc, Lourie Ann R.; Gonzaga, Shienna Mae C.; Tabonda-Nabor, April Mae; Palecpec, Flora Maye R.; Dayao, Helen M.; Roleda, Michael Y. (Springer, 2023-07-08)
    The marine environment is abundant in natural products that are beneficial to humans. Among these compounds are the polyphenols produced by marine flora as secondary metabolites and used as a defense against stressful environmental conditions. Accordingly, recent pharmacological and biomedical studies showed that polyphenols from marine and coastal floras have several important bioactivities including antioxidant property. In this study, we measured the total polyphenol content (TPC) of 75 species of marine-associated flora. The TPC of their methanolic extracts was measured spectrophotometrically using the Folin-Ciocalteu assay and was expressed both as mg phloroglucinol equivalent per g of dry weight (mg PGE g−1 DW) and as mg gallic acid equivalent per g dry weight (mg GAE g−1 DW). The TPC values are higher when expressed in terms of GAE compared to PGE. Also, the mean TPC of tracheopytes (229 ± 43.0 mg PGE g−1 DW) was higher compared to the mean TPC of macroalgae (69.4 ± 9.59 mg PGE g−1 DW). For macroalgae, ochrophytes (97.9 ± 22.7 mg PGE g−1 DW) had the highest mean TPC followed by chlorophytes (80.0 ± 20.5 mg PGE g−1 DW) and rhodophytes (49.5 ± 8.60 mg PGE g−1 DW). Moreover, our study also showed that TPC varied between young and mature tissues, among different color morphotypes and different parts of the plants. Although the concentrations of total polyphenols varied among species, ages, strains and parts of the plant, our study showed that marine and coastal floras are rich sources of polyphenols that could be further examined for their biological activities and other applications in food industry.
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    Genome mining of a novel marine sponge symbiont Nocardia sp. BML-15-R-026U reveals high biosynthetic potential for secondary metabolites, including a non-ribosomal peptide and a polyketide of high novelty
    Gloria, Paul Christian; Romines, Elaine; Punzalan, Marc Jeremie; Florece, Christine Marie; Cadorna, Kreighton; Salvador-Reyes, Lilibeth; Lluisma, Arturo (Philippine-American Academy of Science and Engineering, 2023-11-28)
    Antibiotic and drug resistance poses serious global public health threats, leading to substantial infections and fatalities annually. Addressing these issues requires the discovery of novel bioactive compounds and a faster and more cost-effective discovery process. However, traditional approaches, which require isolation and multi-step purification of compounds from organisms and running of initial assays, suffer from serious limitations such as the need for substantial amounts of biological material and high rates of compound rediscoveries. Because the biosynthetic capabilities of organisms are encoded in their genomes, genome mining provides a promising solution that would complement traditional approaches. This study conducted long-read whole genome sequencing on a marine sponge symbiont, Nocardia sp. BML-15-R-026U, to explore its genomic repertoire of secondary metabolite-encoding Biosynthetic Gene Clusters (BGCs). A four-contig genome assembly was generated for this isolate with a high degree of completeness and an estimated genome size of 4.84 Mbp. Its genome displays remarkable biosynthetic potential by containing at least 34 distinct secondary metabolite BGCs, predominantly Non-Ribosomal Peptide Synthetase (NRPS) and Polyketide Synthase (PKS) systems capable of producing novel chemical structures. Further analysis was focused on two genomic regions. In region 3.10, the study predicted a BGC for a novel, serine-rich non-ribosomal peptide with a predicted molecular weight of 2754 g/mol. Region 3.12 contained an iterative type-I PKS BGC, suggesting the potential synthesis of a polyketide compound with oxidoreductase-inhibiting properties. This study highlights genome mining as a productive early-phase approach for identifying promising drug leads and has identified the most promising candidates among this isolate’s BGCs for experimental validation.
    The study was funded by the Philippine Council for Health Research and Development – Department of Science and Technology under the “Anti-infective and Anticancer Drug Candidates from Marine Microorganisms and Sponges: Discovery and Development” project, Marine Science Institute – UP Diliman. The authors would like to thank the researchers of the Marine Genomics and Molecular Genetics Laboratory, MSI. The authors would also like to thank the researchers of the Discovery and Development of Health Products – Marine Component Phase I and researchers of the Marine Pharmacognosy Laboratory for the collection and initial analysis of the sample used in this study and storage and maintenance of the bacterial cultures. Sample collection was done under Gratuitous Permit No. GP-0084-15.