微生物罗多普辛从结构到功能和生态适应
Anna Karnkowska1, Małgorzata Malczewska1
1Uniwersytet Warszawski, Wydział Biologii, Instytut Biologii Ewolucyjnej.
Postepy biochemii
|January 8, 2026
概括
罗多普辛是对视力和能量转化至关重要的蛋白质,存在于动物和微生物中. 它们的独特结构表明了单独的进化路径,环境因素影响了微生物罗多素的多样性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 罗多普辛是所有生命领域中发现的必需蛋白质,包括动物和微生物类型.
- 这两种罗多普辛类型都具有7个跨膜α螺旋体和一个视网膜连接体的保存结构.
- 尽管结构相似,但动物和微生物罗多普辛缺乏序列同质性,这表明它们的演化趋同.
研究的目的:
- 探索罗多普辛蛋白质的多样性和进化分歧.
- 研究动物和微生物罗多普辛在不同生物和环境中的功能作用.
- 了解环境因素,特别是水生生态系统中的环境因素如何塑造罗多素序列和结构.
主要方法:
- 动物和微生物罗多普辛的比较序列分析.
- 罗多普辛蛋白家族的结构分析.
- 生态和环境数据与罗多普辛特征的相关性.
主要成果:
- 动物和微生物罗多普辛独立进化,具有不同的功能,如视觉和能量传导.
- 微生物罗多普辛在微生物中广泛存在,在光毒性和离子运输中发挥作用.
- 海洋与淡水生态系统中的环境条件显著影响罗多的光学特性,序列和结构.
结论:
- 罗多普辛是由功能和环境压力驱动的融合进化的一个令人着迷的例子.
- 需要对淡水微生物罗多普辛进行进一步的研究,以充分了解它们的多样性和生态意义.
- 这项研究强调了罗多普辛蛋白质适应各种环境的适应性,以及它们在细胞能量管理中的基本作用.
相关概念视频
01:11Channel Rhodopsins
3.1K
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
3.1K
01:22Photoreceptors and Visual Pathways
8.7K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
8.7K
01:20Anatomy of the Eyeball
9.4K
The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
9.4K
01:16Transduction
1.2K
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
1.2K
01:29The Photochemical Reaction Center
5.2K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
5.2K
01:30Anoxygenic Photosynthesis
1.1K
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
1.1K