H2 Metabolism revealed by metagenomic analysis of subglacial sediment from East Antarctica

Zhifeng Yang; Yu Zhang; Yongxin Lv; Wenkai Yan; Xiang Xiao; Bo Sun; Hongmei Ma

doi:10.1007/s12275-019-9366-2

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H2 Metabolism revealed by metagenomic analysis of subglacial sediment from East Antarctica: Zhifeng Yang ^1,2,3, Yu Zhang ^2,3, Yongxin Lv ^2,3, Wenkai Yan ^2,3, Xiang Xiao ^2,3, Bo Sun ¹, Hongmei Ma ¹; Journal of Microbiology 2019;57(12):1095-1104.
DOI: https://doi.org/10.1007/s12275-019-9366-2
Published online: November 22, 2019

¹SOA Key Laboratory for Polar Science, Polar Research Institute of China, P. R. China, ²State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, P. R. China, ³School of Oceanography, Shanghai Jiao Tong University, P. R. China¹SOA Key Laboratory for Polar Science, Polar Research Institute of China, P. R. China, ²State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, P. R. China, ³School of Oceanography, Shanghai Jiao Tong University, P. R. China

Corresponding author: Hongmei Ma , Tel: +86-21-58711801,

Received: 30 July 2019 • Revised: 14 October 2019 • Accepted: 6 November 2019

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Abstract

Subglacial ecosystems harbor diverse chemoautotrophic microbial communities in areas with limited organic carbon, and lithological H2 produced during glacial erosion has been considered an important energy source in these ecosystems. To verify the H2-utilizing potential there and to identify the related energy-converting metabolic mechanisms of these communities, we performed metagenomic analysis on subglacial sediment samples from East Antarctica with and without H2 supplementation. Genes coding for several [NiFe]- hydrogenases were identified in raw sediment and were enriched after H2 incubation. All genes in the dissimilatory nitrate reduction and denitrification pathways were detected in the subglacial community, and the genes coding for these pathways became enriched after H2 was supplied. Similarly, genes transcribing key enzymes in the Calvin cycle were detected in raw sediment and were also enriched. Moreover, key genes involved in H2 oxidization, nitrate reduction, oxidative phosphorylation, and the Calvin cycle were identified within one metagenome-assembled genome belonging to a Polaromonas sp. As suggested by our results, the microbial community in the subglacial environment we investigated consisted of chemoautotrophic populations supported by H2 oxidation. These results further confirm the importance of H2 in the cryosphere.

Keywords: subglacial;Antarctic;hydrogen;chemoautotrophy;nitrate;metagenome

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H2 Metabolism revealed by metagenomic analysis of subglacial sediment from East Antarctica

J. Microbiol. 2019;57(12):1095-1104. Published online November 22, 2019

DOI: https://doi.org/10.1007/s12275-019-9366-2

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