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磷酸盐限制的海洋区域选择富含碳-磷裂解酶途径的细菌种群,用于降解膦酸盐。

Phosphate-limited ocean regions select for bacterial populations enriched in the carbon-phosphorus lyase pathway for phosphonate degradation.

机构信息

Daniel K. Inouye Center for Microbial Oceanography: Research and Education, University of Hawai'i at Mānoa, Honolulu, HI, 96822, USA.

Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, 02540, USA.

出版信息

Environ Microbiol. 2019 Jul;21(7):2402-2414. doi: 10.1111/1462-2920.14628. Epub 2019 May 27.

Abstract

In tropical and subtropical oceanic surface waters phosphate scarcity can limit microbial productivity. However, these environments also have bioavailable forms of phosphorus incorporated into dissolved organic matter (DOM) that microbes with the necessary transport and hydrolysis metabolic pathways can access to supplement their phosphorus requirements. In this study we evaluated how the environment shapes the abundance and taxonomic distribution of the bacterial carbon-phosphorus (C-P) lyase pathway, an enzyme complex evolved to extract phosphate from phosphonates. Phosphonates are organophosphorus compounds characterized by a highly stable C-P bond and are enriched in marine DOM. Similar to other known bacterial adaptions to low phosphate environments, C-P lyase was found to become more prevalent as phosphate concentrations decreased. C-P lyase was particularly enriched in the Mediterranean Sea and North Atlantic Ocean, two regions that feature sustained periods of phosphate depletion. In these regions, C-P lyase was prevalent in several lineages of Alphaproteobacteria (Pelagibacter, SAR116, Roseobacter and Rhodospirillales), Gammaproteobacteria, and Actinobacteria. The global scope of this analysis supports previous studies that infer phosphonate catabolism via C-P lyase is an important adaptive strategy implemented by bacteria to alleviate phosphate limitation and expands the known geographic extent and taxonomic affiliation of this metabolic pathway in the ocean.

摘要

在热带和亚热带海洋表层水中,磷酸盐的匮乏会限制微生物的生产力。然而,这些环境中也存在着生物可利用的磷形式,它们被结合在溶解的有机物(DOM)中,微生物可以通过必要的运输和水解代谢途径来获取这些磷,以补充其对磷的需求。在这项研究中,我们评估了环境如何塑造细菌碳磷(C-P)裂解酶途径的丰度和分类分布,该途径是一种进化而来的酶复合物,用于从膦酸盐中提取磷酸盐。膦酸盐是一类具有高度稳定的 C-P 键的有机磷化合物,在海洋 DOM 中富集。与其他已知的细菌适应低磷环境的方式相似,C-P 裂解酶的丰度随着磷酸盐浓度的降低而增加。C-P 裂解酶在地中海和北大西洋两个区域特别丰富,这两个区域都有持续的磷耗竭期。在这些区域,C-P 裂解酶在几个α变形菌(Pelagibacter、SAR116、Roseobacter 和 Rhodospirillales)、γ变形菌和放线菌的谱系中丰富存在。这项全球范围的分析支持了先前的研究,即通过 C-P 裂解酶进行膦酸盐代谢是细菌缓解磷限制的一种重要适应策略,并扩展了该代谢途径在海洋中的已知地理范围和分类归属。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/12bd/6852614/3f9f4ad035ef/EMI-21-2402-g001.jpg

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