Contribution of Proteorhodopsin to Light-Dependent Biological Responses in Hymenobacter nivis P3T Isolated from Red Snow in Antarctica.

IF 2.9 3区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Biochemistry Biochemistry Pub Date : 2024-09-17 Epub Date: 2024-08-28 DOI:10.1021/acs.biochem.4c00286
Kaori Kondo, Ryouhei Ohtake, Shunsuke Nakano, Mia Terashima, Hisaya Kojima, Manabu Fukui, Makoto Demura, Takashi Kikukawa, Takashi Tsukamoto
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Abstract

Proteorhodopsin (PR) is a major family of microbial rhodopsins that function as light-driven outward proton pumps. PR is now widely recognized for its ecological importance as a molecule responsible for solar energy flow in various ecosystems on the earth. However, few concrete examples of the actual use of light by natural microorganisms via PR have been demonstrated experimentally. This study reveals one example of that in a cryophilic bacterium Hymenobacter nivis P3T isolated from red snow in Antarctica. The results demonstrate light-dependent biochemical and biological responses in H. nivis cells, such as the proton pump activity of H. nivis PR (HnPR), which leads to the production of proton motive force, cellular ATP production, and cell growth. In addition, the results of this study demonstrate the photochemical properties of a PR, namely, HnPR, in the membrane of a natural host bacterium. The photocycle of HnPR was much faster than other PRs even at 5 °C, indicating that the proton pump function of HnPR has adapted to the low-temperature environment of Antarctica. Although it is well-known that PR helps natural host microorganisms to use light energy, this study provides another concrete example for understanding the biological role of PR by demonstrating the link between the molecular functions of PR and the light-dependent biochemical and biological responses of a PR-bearing host.

Abstract Image

从南极洲红雪中分离出的 Hymenobacter nivis P3T 中的蛋白光蛋白对光依赖性生物反应的贡献。
蛋白络合素(PR)是微生物络合素的一个主要家族,具有光驱动外向质子泵的功能。作为地球上各种生态系统中负责太阳能流动的分子,PR 的生态重要性现已得到广泛认可。然而,很少有实验证明自然微生物通过 PR 实际利用光的具体实例。本研究揭示了从南极洲红雪中分离出的一种嗜低温细菌 Hymenobacter nivis P3T 的一个实例。研究结果表明,H. nivis 细胞中的生化和生物反应依赖于光,如 H. nivis PR(HnPR)的质子泵活性导致质子动力的产生、细胞 ATP 的产生和细胞的生长。此外,本研究结果还证明了一种 PR(即 HnPR)在天然宿主细菌膜中的光化学特性。即使在 5 °C,HnPR 的光周期也比其他 PR 快得多,这表明 HnPR 的质子泵功能已经适应了南极洲的低温环境。尽管众所周知质子泵能帮助自然宿主微生物利用光能,但本研究通过证明质子泵的分子功能与携带质子泵的宿主的光依赖性生化反应之间的联系,为了解质子泵的生物学作用提供了另一个具体实例。
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来源期刊
Biochemistry Biochemistry
Biochemistry Biochemistry 生物-生化与分子生物学
CiteScore
5.50
自引率
3.40%
发文量
336
审稿时长
1-2 weeks
期刊介绍: Biochemistry provides an international forum for publishing exceptional, rigorous, high-impact research across all of biological chemistry. This broad scope includes studies on the chemical, physical, mechanistic, and/or structural basis of biological or cell function, and encompasses the fields of chemical biology, synthetic biology, disease biology, cell biology, nucleic acid biology, neuroscience, structural biology, and biophysics. In addition to traditional Research Articles, Biochemistry also publishes Communications, Viewpoints, and Perspectives, as well as From the Bench articles that report new methods of particular interest to the biological chemistry community.
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