Rhodopirellula aestuarii sp. nov., a novel member of the genus Rhodopirellula isolated from brackish sediments collected in the Tagus River estuary, Portugal

Vitorino, Inês; Klimek, Dominika; Całusińska, Magdalena; Lobo‐da‐Cunha, Alexandre; Vasconcelos, Vítor; Lage, Olga Maria

doi:10.1016/j.syapm.2022.126360

Cited by 4 publications

(1 citation statement)

References 68 publications

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“…1. Novel recently described species (Godinho et al 2021;Vitorino, et al 2020Vitorino, et al , 2021aVitorino, et al , 2022aVitorino, et al , 2022bVitorino, et al , 2022cVitorino, et al , 2023 were also included in this study. Metabolites from Planctomycetota cultured in oligotrophic medium were extracted with organic solvents and followed by antimicrobial and antifungal assays, in a first stage, against two different types of bacteria (the Gram-negative Escherichia coli and the Gram-positive Staphylococcus aureus) and three different fungi (the yeast Candida albicans and the filamentous fungi Trichophyton rubrum and Aspergillus fumigatus).…”

Section: Introductionmentioning

confidence: 99%

Uncovering the biotechnological capacity of marine and brackish water Planctomycetota

Vitorino,

Pinto,

Martín

et al. 2024

Antonie van Leeuwenhoek

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An appealing strategy for finding novel bioactive molecules in Nature consists in exploring underrepresented and -studied microorganisms. Here, we investigated the antimicrobial and tumoral anti-proliferative bioactivities of twenty-three marine and estuarine bacteria of the fascinating phylum Planctomycetota. This was achieved through extraction of compounds produced by the Planctomycetota cultured in oligotrophic medium followed by an antimicrobial screening against ten relevant human pathogens including Gram-positive and Gram-negative bacteria, and fungi. Cytotoxic effects of the extracts were also evaluated against five tumoral cell lines. Moderate to potent activities were obtained against Enterococcus faecalis, methicillin-sensitive and methicillin-resistant Staphylococcus aureus and vancomycin-sensitive and vancomycin-resistant Enterococcus faecium. Anti-fungal effects were observed against Trichophyton rubrum, Candida albicans and Aspergillus fumigatus. The highest cytotoxic effects were observed against human breast, pancreas and melanoma tumoral cell lines. Novipirellula caenicola and Rhodopirellula spp. strains displayed the widest spectrum of bioactivities while Rubinisphaera margarita ICM_H10T affected all Gram-positive bacteria tested. LC-HRMS analysis of the extracts did not reveal the presence of any known bioactive natural product, suggesting that the observed activities are most likely caused by novel molecules, that need identification. In summary, we expanded the scope of planctomycetal species investigated for bioactivities and demonstrated that various strains are promising sources of novel bioactive compounds, which reenforces the potential biotechnological prospects offered by Planctomycetota.

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