Project description:By using heterotrophic proteome as reference, 169 proteins were found to change their abundance during autotrophic growth. The up-regulated proteins indicated that M. cuprina fixed CO2 through the previously identified 3-HB-CoA/4-HB-CoA cycle and obtained energy by oxidation of elemental sulfur as energy source under autotrophic growth. Enzymes/proteins involved in semi- and non-phosphorylating Entner-Doudoroff (ED) pathway were down-regulated. We also found that some transporter proteins changed their abundances, suggest that they were likely playing pivotal roles for growth under the respective conditions.
Project description:This experiment aims on the identification of serine hydrolases from a complex thermophile community that live in a hot vent in Kamchatka Peninsula based on in vivo labelling with FP-alkyne directly in the hot spring and subsequent analysis using metagenomics/metaproteomics. To this end, sediment samples were collected and treated using the following three conditions. DMSO- treated control FP-alkyne labelled Samples for each condition were prepared in triplicate, resulting a total number of 6 samples per spring. Labelling was performed using 4 µM of the probe FP-alkyne and incubation for 2 h in the hot spring.
Project description:Hydrogen served as a competitive inorganic energy source, impacting the CuFeS2 bioleaching efficiency of the extremely thermoacidophilic archaeon Metallosphaera sedula. Open reading frames encoding key terminal oxidase and electron transport chain components were triggered by CuFeS2. Evidence of heterotrophic metabolism was noted after extended periods of bioleaching, presumably related to cell lysis.
