摘要
The majority of marine microbes remain uncultured,which hinders the identification and mining of CO_(2)-fixing genes,pathways,and chassis from the oceans.Here,we investigated CO_(2)-fixing microbes in seawater from the euphotic zone of the Yellow Sea of China by detecting and tracking their ^(13)C-bicarbonate(^(13)C-HCO_(3)^(-))intake via single-cell Raman spectra(SCRS)analysis.The target cells were then isolated by Raman-activated Gravity-driven Encapsulation(RAGE),and their genomes were amplified and sequenced at one-cell resolution.The single-cell metabolism,phenotype and genome are consistent.We identified a notyet-cultured Pelagibacter spp.,which actively assimilates ^(13)C-HCO_(3)^(-),and also possesses most of the genes encoding enzymes of the Calvin-Benson cycle for CO_(2) fixation,a complete gene set for a rhodopsin-based light-harvesting system,and the full genes necessary for carotenoid synthesis.The four proteorhodopsin(PR)genes identified in the Pelagibacter spp.were confirmed by heterologous expression in E.coli.These results suggest that hitherto uncultured Pelagibacter spp.uses light-powered metabolism to contribute to global carbon cycling.
基金
the National Key R&D Program Young Scientists Project of China(No.2021YFD1900400 to XYJ)
the National Science Foundation of China(No.32270109 to XYJ)
BM acknowledges the support of the Key Instrument Development Program from Chinese Academy of Sciences(YJKYYQ20170017)
WEH acknowledges finance and instrumentation support from the Engineering and Physical Sciences Research Council(EP/M002403/1 and EP/M02833X/1)and Natural Environment Research Council(NE/M002934/1)
WEH,PAD,CMC,and CNH acknowledge financial support from the Biotechnology and Biological Sciences Research Council(BBSRC UK),award number BB/M000265/1
CNH and PAD are supported by the European Research Council Synergy Award 854126.We also thank NSFC(31770112)for the financial support.
