The Thermal-Stable LH1-RC Complex of a Hot Spring Purple Bacterium Powers Photosynthesis with Extremely Low-Energy Near-Infrared Light.

IF 2.9 3区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Biochemistry Biochemistry Pub Date : 2025-01-07 Epub Date: 2024-12-16 DOI:10.1021/acs.biochem.4c00506
Yukihiro Kimura, Ryo Kanno, Kaisei Mori, Yoshiki Matsuda, Ryuta Seto, Shinji Takenaka, Hiroyuki Mino, Tatsunari Ohkubo, Mai Honda, Yuji C Sasaki, Jun-Ichi Kishikawa, Kaoru Mitsuoka, Kazuhiro Mio, Malgorzata Hall, Endang R Purba, Toshiaki Mochizuki, Akira Mizoguchi, Bruno M Humbel, Michael T Madigan, Zheng-Yu Wang-Otomo, Kazutoshi Tani
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引用次数: 0

Abstract

Blastochloris (Blc.) tepida is a hot spring purple nonsulfur phototrophic bacterium that contains bacteriochlorophyll (BChl) b. Here, we present a 2.21 Å cryo-EM structure of the thermostable light-harvesting 1-reaction center (LH1-RC) complex from Blc. tepida. The LH1 ring comprises 16 circularly arranged αβγ-subunits plus one αβ-subunit that surround the RC complex composed of C-, H-, L-, and M-subunits. In a comparative study, the Blc. tepida LH1-RC showed numerous electrostatic and hydrophobic interactions both within the LH1 complex itself and between the LH1 and the RC complexes that are absent from the LH1-RC complex of its mesophilic counterpart, Blc. viridis. These additional interactions result in a tightly packed LH1-RC architecture with a reduced accessible surface area per volume that enhances the thermal stability of the Blc. tepida complex and allows the light reactions of photosynthesis to proceed at hot spring temperatures. Moreover, based on high-resolution structural information combined with spectroscopic evidence, the unique photosynthetic property of the Blc. tepida LH1-RC─absorption of energy-poor near-infrared light beyond 1000 nm─can be attributed to strong hydrogen-bonding interactions between the C3-acetyl C═O of the LH1 BChl b and two LH1 α-Trp residues, structural rigidity of the LH1, and the enhanced exciton coupling of the LH1 BChls of this thermophile.

温泉紫色细菌的热稳定LH1-RC配合物在极低能近红外光下进行光合作用。
Blastochloris (Blc.) tepida是一种含有细菌叶绿素(BChl) b的温泉紫色非硫光养细菌。在这里,我们展示了Blc的耐热捕光1-反应中心(LH1-RC)配合物的2.21 Å低温电镜结构。tepida。LH1环由16个圆形排列的αβγ-亚基和1个围绕由C-、H-、L-和m亚基组成的RC配合物的αβ-亚基组成。在一项比较研究中,英国央行。温虫LH1-RC在LH1配合物内部和LH1与RC配合物之间表现出大量的静电和疏水相互作用,而这些相互作用是其中温亲和物Blc的LH1-RC配合物所没有的。冬青。这些额外的相互作用导致了紧凑的LH1-RC结构,每体积的可接近表面积减少,增强了Blc的热稳定性。温水藻复合体,使光合作用的光反应在温泉温度下进行。此外,基于高分辨率的结构信息结合光谱证据,Blc独特的光合特性。LH1- rc对1000 nm以上的弱能近红外光的吸收,可以归因于LH1 BChl b的c3 -乙酰C = O与两个LH1 α-色氨酸残基之间的强氢键相互作用、LH1的结构刚性以及LH1 BChl的激子耦合增强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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