Preliminary Analysis Of High Pressure And Cold Adaptation Mechanisms Of Microbacterium Sediminis YLB-01

Oceans cover more than70%of the Earth’s surface, which accounted for49%of the deep-sea environment of the earth’s surface.It is the surface of the Earth’s largest habitat sites. Deep-sea microorganisms live at high pressure, low temperature （some areas, such as high-temperature hydrothermal vents）, oligotrophic, anaerobic, extreme pH gradient, high salt concentrations, high metal concentrations, no light, and other special extreme environments. The special nature of its ecological environment determines that the deep-sea microbes compared with terrestrial microbes have very specific metabolic pathways and biological structure.In the deep sea, low temperature （2-4℃） and high pressure （on average380atm）are the most typical environmental factors. To live in such extreme environments, deep-sea bacteria inevitably develop with the corresponding molecular basis. Those include regulation of various metabolic pathways, material transport, membrane structure changes and changes in the structure of biological macromolecules and so on. Taking deep Gram-positive strains of Microbacterium sediminis YLB-01as a model, by simulating the deep sea environment culture conditions （low temperature, high pressure）, the use of transcriptome and proteome technical analysis of gene and protein whose differential expression, combined with genomic analysis, try answer Microbacterium sediminis YLB-01adaptive molecular basis of low temperature and high pressure deep factors.The genome sequencing fine figure of Microbacterium sediminis YLB-01showed that the full-length of bacteria is2,760,011bp, G+C%content of71.88%.2,630coding genes were predicted by GeneMarkS software, of which the proportion of the length of the coding region of the genome is91.78%. Two genes Island were forecasted by Software IslandPath-DIOMB. Genomic islands can encode multiple functions, with increased biological adaptability and so on. PHAST software displays YLB-01contains a prophage prophage. Prophage may have enhanced adaptability to the environment, to improve adhesion and other functions. Genomic prediction results YLB-01containing5suspicious CRISPR. Seen from the evolutionary relationships among species in the diagram, the two marine sources of Microbacterium in evolutionary relationship is more primitive than three terrestrial sources of Microbacterium. And they may have evolved in the same relationship of the ancestors of three terrestrial Microbacterium. Transcriptome analysis showed that KEGG metabolic pathways involved in lipoprotein expression which is Peptidoglycan biosynthesis:mts:MTES₃232, involves the synthesis of the cell wall. KEGG metabolic pathway is involved in ribosomal protein L30Ribosome:mts:MTES₀907, and on the structure stability of the liposome. KEGG metabolic pathways phosphate ABC transporter ATP-binding protein involved is ABC transporters:mts:MTES₂452, participated in the material transport and ion transport.Proteome analysis showed that14protein spots were credible. They are respectively with bacterial cell wall synthesis, synthesis of biological macromolecules, material transport or transport across the plasma membrane, regulation of gene transcription, stability related pyrimidine nucleotide metabolism and Stability in ribosomal structure.