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Johann Deisenhofer 博士 講演会

講師:Prof. Dr. Johann Deisenhofer (University of Texas Southwestern Medical Center, Dallas, USA)
演題:Structural Biology of Photosynthetic Light Reactions
日時:2013年10月17日 (木) 16:30〜18:00


ABSTRACT: In this lecture I will give an overview of crystal structures of photosynthetic reaction centers (RCs) and photosystems (PS I and PS II), with emphasis on common features. The structure of the RC from the purple bacterium Rhodopseudomonas viridis (now Blastochloris viridis), a complex of 4 protein subunits and 14 co-factors, showed in its core an arrangement of chlorophylls, pheophytins and quinones with an approximate twofold symmetry (Deisenhofer et al. 1985). This structural symmetry is in contrast to functional asymmetry, with electron transfer preferentially along only one of two paths formed by chlorophylls, a pheophytin, a quinone, ending on the second quinone. A similar twofold structural symmetry exists in the cores of PS I (Jordan et al. 2001) and PS II (Zouni et al. 2001; Umena et al. 2011). While the functional asymmetry is almost complete in PS II, it is less so in PS I (Poluektov et al. 2005). The structural similarity of the cores of RC, PS I, and PS II strongly supports the assumption of a common evolutionary origin of these complexes.

  • Deisenhofer, J, O Epp, K Miki, R Huber, and H Michel. 1985. Structure of the protein subunits in the photosynthetic reaction centre of rhodopseudomonas viridis at 3A resolution. Nature 318 (6047): 618-24.
  • Jordan, P, P Fromme, H T Witt, O Klukas, W Saenger, and N Krauss. 2001. Threedimensional structure of cyanobacterial photosystem I at 2.5 A resolution. Nature 411 (6840): 909-17.
  • Poluektov, Oleg G, Sergei V Paschenko, Lisa M Utschig, K V Lakshmi, and Marion C Thurnauer. 2005. Bidirectional electron transfer in photosystem I: Direct evidence from high-frequency time-resolved EPR spectroscopy. J Am Chem Soc 127 (34): 11910-1.
  • Umena, Yasufumi, Keisuke Kawakami, Jian-Ren Shen, and Nobuo Kamiya. 2011. Crystal structure of oxygen-evolving photosystem II at a resolution of 1.9 A. Nature 473 (7345): 55-60.
  • Zouni, A, H T Witt, J Kern, P Fromme, N Krauss, W Saenger, and P Orth. 2001. Crystal structure of photosystem II from synechococcus elongatus at 3.8 A resolution. Nature 409 (6821): 739-43.

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