The Antenna System of Photosystem II From Thermosynechococcus elongatus at 3.2 Å Resolution
| Autor: | Jacek Biesiadka, Wolfram Saenger, K.-D. Irrgang, Bernhard Loll, Athina Zouni, J. Kern |
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| Rok vydání: | 2005 |
| Předmět: |
Models
Molecular Synechococcus Pheophytin Chlorophyll a P700 Photosystem II Chemistry Temperature Photosystem II Protein Complex Light-harvesting complexes of green plants Cell Biology Plant Science General Medicine Crystallography X-Ray Photosystem I Biochemistry Protein Structure Tertiary Protein Subunits Crystallography chemistry.chemical_compound Thylakoid Chromatography High Pressure Liquid Photosystem |
| Zdroj: | Photosynthesis Res. |
| ISSN: | 1573-5079 0166-8595 |
| DOI: | 10.1007/s11120-005-4117-0 |
| Popis: | The content and type of cofactors harboured in the Photosystem II core complex (PS IIcc) of the cyanobacterium Thermosynechococcus elongatus has been determined by biochemical and spectroscopic methods. 17 +/- 1 chlorophyll a per pheophytin a and 0.25 beta-carotene per chlorophyll a have been found in re-dissolved crystals of dimeric PS IIcc. The X-ray crystal structure of PS IIcc from Thermosynechococcus elongatus at 3.2 A resolution clearly shows chlorophyll a molecules arranged in two layers close to the cytoplasmic and lumenal sides of the thylakoid membrane. Each of the cytoplasmic layers contains 9 chlorophyll a, whose positions and orientations are related by a local twofold rotation pseudo-C2 axis passing through the non-haem Fe2+. These chlorophyll a are arranged comparably to those in the antenna domains of PsaA and PsaB of cyanobacterial Photosystem I affirming an evolutionary relation. The chlorophyll a in the lumenal layer are less well conserved between Photosystems I and II and even between CP43 and CP47 with 4 chlorophyll a in the former and 7 in the latter. |
| Databáze: | OpenAIRE |
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