Scholarlink

<p>Microbial rhodopsins are light-driven membrane proteins that convert photon energy into biological functions via photocycles initiated by retinal chromophore isomerization. Although their structural and functional properties under ambient conditions have been extensively characterized, the structural basis of adaptation and function of microbial rhodopsins inhabiting extreme environments remains largely unexplored. This study investigates the pressure-dependent spectroscopic properties of <i>Parvularcula oceani</i> xenorhodopsin (<i>Po</i>XeR), a deep-sea inward proton-pumping microbial rhodopsin from <i>Parvularcula oceani</i>, and compares its behavior with that of the terrestrial microbial <i>Gloeobacter</i> rhodopsin (GR). Spectroscopic analyses under hydrostatic pressure reveal that <i>Po</i>XeR exhibits inherent robustness under pressure, whereas GR undergoes irreversible structural perturbations. Circular dichroism spectroscopy demonstrates that <i>Po</i>XeR undergoes pressure-induced oligomerization, which contributes to its enhanced structural stability and functional robustness. These results suggest that oligomerization-mediated structural stabilization is a key adaptive strategy that enables <i>Po</i>XeR to maintain its function under extreme conditions and elucidates the molecular mechanisms of environmental adaptation in microbial rhodopsins.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Hydrostatic pressure spectroscopy reveals the adaptation of microbial rhodopsins to high-pressure environment

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月8日

查看全文
  • Tomoyuki Hamachi,
  • Iori Okamura,
  • Lyu Zikun,
  • Kentaro Mannen,
  • Yoshitaka Kato,
  • Takashi Nagata,
  • Keiichi Inoue,
  • Gaku Fukuhara

摘要

Microbial rhodopsins are light-driven membrane proteins that convert photon energy into biological functions via photocycles initiated by retinal chromophore isomerization. Although their structural and functional properties under ambient conditions have been extensively characterized, the structural basis of adaptation and function of microbial rhodopsins inhabiting extreme environments remains largely unexplored. This study investigates the pressure-dependent spectroscopic properties of Parvularcula oceani xenorhodopsin (PoXeR), a deep-sea inward proton-pumping microbial rhodopsin from Parvularcula oceani, and compares its behavior with that of the terrestrial microbial Gloeobacter rhodopsin (GR). Spectroscopic analyses under hydrostatic pressure reveal that PoXeR exhibits inherent robustness under pressure, whereas GR undergoes irreversible structural perturbations. Circular dichroism spectroscopy demonstrates that PoXeR undergoes pressure-induced oligomerization, which contributes to its enhanced structural stability and functional robustness. These results suggest that oligomerization-mediated structural stabilization is a key adaptive strategy that enables PoXeR to maintain its function under extreme conditions and elucidates the molecular mechanisms of environmental adaptation in microbial rhodopsins.