Microbial Functional Responses to Cholesterol Catabolism in Denitrifying Sludge

Sean Ting Shyang Wei, Yu Wei Wu, Tzong Huei Lee, Yi Shiang Huang, Cheng Yu Yang, Yi Lung Chen, Yin Ru Chiang

研究成果: 雜誌貢獻文章同行評審

5 引文 斯高帕斯(Scopus)


The 2,3-seco pathway, the pathway for anaerobic cholesterol degradation, has been established in the denitrifying betaproteobacterium Sterolibacterium denitrificans. However, knowledge of how microorganisms respond to cholesterol at the community level is elusive. Here, we applied mesocosm incubation and 16S rRNA sequencing to reveal that, in denitrifying sludge communities, three betaproteobacterial operational taxonomic units (OTUs) with low (94% to 95%) 16S rRNA sequence similarity to Stl. denitrificans are cholesterol degraders and members of the rare biosphere. Metatranscriptomic and metabolite analyses show that these degraders adopt the 2,3-seco pathway to sequentially catalyze the side chain and sterane of cholesterol and that two molybdoenzymes—steroid C25 dehydrogenase and 1-testosterone dehydrogenase/hydratase—are crucial for these bioprocesses, respectively. The metatranscriptome further suggests that these betaproteobacterial degraders display chemotaxis and motility toward cholesterol and that FadL-like transporters may be the key components for substrate uptake. Also, these betaproteobacteria are capable of transporting micronutrients and synthesizing cofactors essential for cellular metabolism and cholesterol degradation; however, the required cobalamin is possibly provided by cobalamin-de novo-synthesizing gamma-, delta-, and betaproteobacteria via the salvage pathway. Overall, our results indicate that the ability to degrade cholesterol in sludge communities is reserved for certain rare biosphere members and that C25 dehydrogenase can serve as a biomarker for sterol degradation in anoxic environments.

出版狀態已發佈 - 十月 2018

ASJC Scopus subject areas

  • 微生物學
  • 生理學
  • 生物化學
  • 生態學、進化論、行為學與系統學
  • 建模與模擬
  • 分子生物學
  • 遺傳學
  • 電腦科學應用


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