2pps: Difference between revisions
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==Overview== | ==Overview== | ||
The 4 A X-ray structure model of trimeric photosystem I of the, cyanobacterium Synechococcus elongatus reveals 31 transmembrane, nine, surface and three stromal alpha-helices per monomer, assigned to the 11, protein subunits: PsaA and PsaB are related by a pseudo two-fold axis, normal to the membrane plane, along which the electron transfer pigments, are arranged. 65 antenna chlorophyll a (Chl a) molecules separated by < or, = 16 A form an oval, clustered net continuous with the electron transfer, chain through the second and third Chl a pairs of the electron transfer, system. This suggests a dual role for these Chl a both in excitation, energy and electron transfer. The architecture of the protein core, indicates quinone and iron-sulphur type reaction centres to have a common, . | The 4 A X-ray structure model of trimeric photosystem I of the, cyanobacterium Synechococcus elongatus reveals 31 transmembrane, nine, surface and three stromal alpha-helices per monomer, assigned to the 11, protein subunits: PsaA and PsaB are related by a pseudo two-fold axis, normal to the membrane plane, along which the electron transfer pigments, are arranged. 65 antenna chlorophyll a (Chl a) molecules separated by < or, = 16 A form an oval, clustered net continuous with the electron transfer, chain through the second and third Chl a pairs of the electron transfer, system. This suggests a dual role for these Chl a both in excitation, energy and electron transfer. The architecture of the protein core, indicates quinone and iron-sulphur type reaction centres to have a common, ancestor. | ||
==About this Structure== | ==About this Structure== | ||
2PPS is a | 2PPS is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Synechococcus_elongatus Synechococcus elongatus] with CLA, PQN and SF4 as [http://en.wikipedia.org/wiki/ligands ligands]. This structure superseeds the now removed PDB entry 1PPS. Structure known Active Site: ETS. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2PPS OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: thermophilic cyanobacterium]] | [[Category: thermophilic cyanobacterium]] | ||
''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 12:37:17 2007'' | ||
