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Crystal structures of photosynthetic reaction center and high-potential iron-sulfur protein from Thermochromatium tepidum: Thermostability and electron transfer

机译:光合反应中心的晶体结构和 热色氨酸的高潜力铁硫蛋白 温热:热稳定性和电子转移

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摘要

The reaction center (RC) of photosynthetic bacteria is a membrane protein complex that promotes a light-induced charge separation during the primary process of photosynthesis. In the photosynthetic electron transfer chain, the soluble electron carrier proteins transport electrons to the RC and reduce the photo-oxidized special-pair of bacteriochlorophyll. The high-potential iron-sulfur protein (HiPIP) is known to serve as an electron donor to the RC in some species, where the c-type cytochrome subunit, the peripheral subunit of the RC, directly accepts electrons from the HiPIP. Here we report the crystal structures of the RC and the HiPIP from Thermochromatium (Tch.) tepidum, at 2.2-Å and 1.5-Å resolution, respectively. Tch. tepidum can grow at the highest temperature of all known purple bacteria, and the Tch. tepidum RC shows some degree of stability to high temperature. Comparison with the RCs of mesophiles, such as Blastochloris viridis, has shown that the Tch. tepidum RC possesses more Arg residues at the membrane surface, which might contribute to the stability of this membrane protein. The RC and the HiPIP both possess hydrophobic patches on their respective surfaces, and the HiPIP is expected to interact with the cytochrome subunit by hydrophobic interactions near the heme-1, the most distal heme to the special-pair.
机译:光合细菌的反应中心(RC)是一种膜蛋白复合物,可在光合作用的主要过程中促进光诱导的电荷分离。在光合作用的电子转移链中,可溶性电子载体蛋白将电子传输到RC并还原光氧化的细菌叶绿素特殊对。在某些物种中,高电位铁硫蛋白(HiPIP)可以作为RC的电子供体,其中c型细胞色素亚基(RC的外围亚基)直接接受来自HiPIP的电子。在这里,我们报道了热色氨酸(Tch。tepidum)的RC和HiPIP的晶体结构,分别为2.2-Å和1.5-Å分辨率。 ch锡霉菌可以在所有已知的紫色细菌和Tch中最高的温度下生长。 tepidum RC对高温显示出一定程度的稳定性。与嗜温菌,如绿化杆菌(Blastochloris viridis)的RCs的比较表明,Tch。 tepidum RC具有更多的Arg残基 膜表面,可能有助于保持膜的稳定性 膜蛋白。 RC和HiPIP均具有疏水性斑块 在它们各自的表面上,并且HiPIP有望相互作用 与细胞色素亚基之间的疏水相互作用 heme-1,这对特殊末端的最远端血红素。

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