Characterisation of ‘Candidatus Methylobacter titanis’ sp. nov., a putative novel species of Methylobacter clade 2 and their distribution in sediments of freshwater lakes in maritime Antarctica

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Título

Characterisation of ‘Candidatus Methylobacter titanis’ sp. nov., a putative novel species of Methylobacter clade 2 and their distribution in sediments of freshwater lakes in maritime Antarctica

Tema

ANTARTIDA
METANO
BACTERIAS OXIDANTES DE METANO
METANOTROFOS
BACTERIAS
BIBLIOGRAFIA NACIONAL QUIMICA
2023

Abstract

Global warming has a strong impact on the polar regions, in particular, the Antarctic Peninsula and nearby islands. Methane (CH4) is a major factor in climate change and mitigation of CH4 emissions can be accomplished through microbial oxidation by methanotrophic bacteria. Understanding this biological process is crucial given the shortage of research carried out in this geographical area. The aim of this study was to characterise psychrophilic enrichment cultures of aerobic methanotrophs obtained from lake sediments of the Fildes Peninsula (King George Island, South Shetland Islands) and revealing the distribution of the genus Methylobacter in different lake sediments of the peninsula. Four stable methanotrophic enrichment cultures were obtained and analysed by metagenome-assembled genomes (MAGs). The phylogeny of methanotroph MAGs recovered from these enrichment cultures based on the 16S rRNA gene showed that K-2018 MAG008 and D1-2020 MAG004Ts clustered within the Methylobacter clade 2, with high similarity to Methylobacter tundripaludum SV96T (97.88 and 98.56% respectively). However, the average nucleotide identity (ANI) and digital DNA-DNA hybridization (dDDH) values with M. tundripaludum were < 95% (84.8 and 85.0%, respectively) and < 70% (30.2 and 30.3%, respectively), suggesting that they represent a putative novel species for which the name ‘Ca. Methylobacter titanis’ is proposed. This is the first species of clade 2 of the genus Methylobacter obtained from Antarctica. The bacterial diversity assessed by 16S rRNA gene sequencing of 21 samples of different lakes (water column and sediments) revealed 54 ASVs associated with methanotrophs and the genus Methylobacter as the most abundant. These results suggest that aerobic methanotrophs belonging to the Methylobacter clade 2 would be the main responsible for CH4 oxidation in these sediments.

Autor

Roldán, Diego M.

Fuente

Antonie van Leeuwenhoek, v.116, 2023. -- pp. 721-738

Editor

Springer

Fecha

2023

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Formato

PDF

Extent

18 p.

Idioma

Inglés

Tipo

Artículo

Identificador

10.1007/s10482-023-01840-1

Cobertura

Antártida

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Original Format

PDF
Fecha de agregación
October 11, 2023
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
Roldán, Diego M., “Characterisation of ‘Candidatus Methylobacter titanis’ sp. nov., a putative novel species of Methylobacter clade 2 and their distribution in sediments of freshwater lakes in maritime Antarctica,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed July 18, 2024, https://riquim.fq.edu.uy/items/show/6718.
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