Archaea are simple-celled organisms with a simple structure that do not contain nuclei and membrane-enclosed organelles. They often live in extreme environments such as high temperature, high salt, high pressure, and extreme pH. The adaptation mechanism of archaea to extreme environments has always been one of the research hotspots in the field of microbiology. However, due to the limitation of research methods, the mechanism of defense and adaptation of acidophilic archaea to protons has not been fully revealed.
The research team of Ma Hongwei, a researcher at the Institute of Nanotechnology and Nanobionics, Chinese Academy of Sciences, used a surface-grafted polymer brush rich in side chain hydroxyl groups (OH)-poly (OEGMA) as The biomimetic polymer layer mimics the sugar coat that is also rich in OH outside the cell membrane of acidophilic archaea, thus quantitatively studying the role of OH groups in the acid tolerance mechanism of acidophilic archaea. In this work, an acid-sensitive thioacetal self-assembled monolayer was used as a probe to prepare poly (OEGMA) by surface initiated polymerization (SIP). Real-time monitoring using quartz crystal microbalance (QCM) verified that the biomimetic polymer layer had The obvious proton shielding effect can maintain the local microenvironment of pH ≥ 5.0 for a long time in the acid liquid environment with pH = 1.0. Through copolymerization and block polymerization, the proton shielding ability was systematically studied and carefully modulated.
This bionic study quantitatively revealed a low pH adaptation mechanism of acidophilic archaea, and its results may be applied to the development of acid-proof materials. At the same time, the research results are helpful for in-depth understanding of the interaction between the internal groups of the surface graft polymer and the pH of the solution, as well as the principle of the Au-S bond. Related work was recently published in Scientific Reports (2: 892, 2012).
The above research work was supported by the Chinese Academy of Sciences' "Hundred Talents" project, the National Natural Science Foundation of China, the Chinese Academy of Sciences, the National Foreign Experts Bureau Innovation Team International Partnership Program and the National Major Scientific Research Program (973 Project), and was also analyzed by Suzhou Nano Research Test platform support.
Figure Bionics evidence of hydroxyl-rich poly (OEGMA) polymer as a proton-shielding function of sugar on the surface of acidophilic archaebacteria cells.
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