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Sulfoquinovose is a widespread organosulfur substrate for Roseobacter clade bacteria in the ocean

玫瑰杆菌 生物 有机硫化合物 海洋噬菌体 细菌 单加氧酶 无氧光合作用 红球菌 盐古菌 α蛋白细菌 植物 蓝藻 古细菌 生物化学 硫黄 系统发育学 克莱德 基因 遗传学 新陈代谢 16S核糖体RNA 细胞色素P450 化学 有机化学
作者
Le Liu,Xiaofeng Chen,Jianing Ye,Xiaoyi Ma,Han Yu,Yajie He,Kai Tang
出处
期刊:The ISME Journal [Springer Nature]
卷期号:17 (3): 393-405 被引量:10
标识
DOI:10.1038/s41396-022-01353-1
摘要

Sulfoquinovose (SQ) is one of the most abundant organosulfur compounds in the biosphere, and its biosynthesis and degradation can represent an important contribution to the sulfur cycle. To data, in marine environments, the microorganisms capable of metabolising SQ have remained unidentified and the sources of SQ are still uncertain. Herein, the marine Roseobacter clade bacteria (RCB) Dinoroseobacter shibae DFL 12 and Roseobacter denitrificans OCh 114 were found to grow using SQ as the sole source of carbon and energy. In the presence of SQ, we identified a set of highly up-regulated proteins encoded by gene clusters in these two organisms, of which four homologues to proteins in the SQ monooxygenase pathway of Agrobacterium fabrum C58 may confer the ability to metabolise SQ to these marine bacteria. The sulfite released from SQ desulfonation by FMN-dependent SQ monooxygenase (SmoC) may provide bacteria with reduced sulfur for assimilation, while proteins associated with sulfite production via assimilatory sulfate reduction were significantly down-regulated. Such SQ catabolic genes are restricted to a limited number of phylogenetically diverse bacterial taxa with the predominate genera belonging to the Roseobacter clade (Roseobacteraceae). Moreover, transcript analysis of Tara Oceans project and coastal Bohai Sea samples provided additional evidence for SQ metabolism by RCB. SQ was found to be widely distributed in marine phytoplankton and cyanobacteria with variable intracellular concentrations ranging from micromolar to millimolar levels, and the amounts of SQ on particulate organic matter in field samples were, on average, lower than that of dimethylsulfoniopropionate (DMSP) by one order of magnitude. Together, the phototroph-derived SQ actively metabolised by RCB represents a previously unidentified link in the marine sulfur cycle.
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