1c51
From Proteopedia
(New page: 200px<br /><applet load="1c51" size="450" color="white" frame="true" align="right" spinBox="true" caption="1c51, resolution 4.0Å" /> '''PHOTOSYNTHETIC REACTI...) |
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| - | [[Image:1c51.gif|left|200px]]<br /><applet load="1c51" size=" | + | [[Image:1c51.gif|left|200px]]<br /><applet load="1c51" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1c51, resolution 4.0Å" /> | caption="1c51, resolution 4.0Å" /> | ||
'''PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY'''<br /> | '''PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY'''<br /> | ||
==Overview== | ==Overview== | ||
| - | An improved electron density map of photosystem I (PSI) calculated at 4-A | + | An improved electron density map of photosystem I (PSI) calculated at 4-A resolution yields a more detailed structural model of the stromal subunits PsaC, PsaD, and PsaE than previously reported. The NMR structure of the subunit PsaE of PSI from Synechococcus sp. PCC7002 (Falzone, C. J., Kao, Y.-H., Zhao, J., Bryant, D. A., and Lecomte, J. T. J. (1994) Biochemistry 33, 6052-6062) has been used as a model to interpret the region of the electron density map corresponding to this subunit. The spatial orientation with respect to other subunits is described as well as the possible interactions between the stromal subunits. A first model of PsaD consisting of a four-stranded beta-sheet and an alpha-helix is suggested, indicating that this subunit partly shields PsaC from the stromal side. In addition to the improvements on the stromal subunits, the structural model of the membrane-integral region of PSI is also extended. The current electron density map allows the identification of the N and C termini of the subunits PsaA and PsaB. The 11-transmembrane alpha-helices of these subunits can now be assigned uniquely to the hydrophobic segments identified by hydrophobicity analyses. |
==About this Structure== | ==About this Structure== | ||
| - | 1C51 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]. Full crystallographic information is available from [http:// | + | 1C51 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 <scene name='pdbligand=CLA:'>CLA</scene>, <scene name='pdbligand=PQN:'>PQN</scene> and <scene name='pdbligand=SF4:'>SF4</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1C51 OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Krauss, N.]] | [[Category: Krauss, N.]] | ||
[[Category: Saenger, W.]] | [[Category: Saenger, W.]] | ||
| - | [[Category: Schubert, W | + | [[Category: Schubert, W D.]] |
| - | [[Category: Witt, H | + | [[Category: Witt, H T.]] |
[[Category: CLA]] | [[Category: CLA]] | ||
[[Category: PQN]] | [[Category: PQN]] | ||
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[[Category: thermophilic cyanobacterium]] | [[Category: thermophilic cyanobacterium]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:02:26 2008'' |
Revision as of 10:02, 21 February 2008
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PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY
Overview
An improved electron density map of photosystem I (PSI) calculated at 4-A resolution yields a more detailed structural model of the stromal subunits PsaC, PsaD, and PsaE than previously reported. The NMR structure of the subunit PsaE of PSI from Synechococcus sp. PCC7002 (Falzone, C. J., Kao, Y.-H., Zhao, J., Bryant, D. A., and Lecomte, J. T. J. (1994) Biochemistry 33, 6052-6062) has been used as a model to interpret the region of the electron density map corresponding to this subunit. The spatial orientation with respect to other subunits is described as well as the possible interactions between the stromal subunits. A first model of PsaD consisting of a four-stranded beta-sheet and an alpha-helix is suggested, indicating that this subunit partly shields PsaC from the stromal side. In addition to the improvements on the stromal subunits, the structural model of the membrane-integral region of PSI is also extended. The current electron density map allows the identification of the N and C termini of the subunits PsaA and PsaB. The 11-transmembrane alpha-helices of these subunits can now be assigned uniquely to the hydrophobic segments identified by hydrophobicity analyses.
About this Structure
1C51 is a Protein complex structure of sequences from Synechococcus elongatus with , and as ligands. Full crystallographic information is available from OCA.
Reference
Photosystem I, an improved model of the stromal subunits PsaC, PsaD, and PsaE., Klukas O, Schubert WD, Jordan P, Krauss N, Fromme P, Witt HT, Saenger W, J Biol Chem. 1999 Mar 12;274(11):7351-60. PMID:10066799
Page seeded by OCA on Thu Feb 21 12:02:26 2008
Categories: Protein complex | Synechococcus elongatus | Fromme, P. | Jordan, P. | Klukas, O. | Krauss, N. | Saenger, W. | Schubert, W D. | Witt, H T. | CLA | PQN | SF4 | Core- antenna light-harvesting system | Helix-bundle membrane protein | Oxygenic photosynthesis | Photosynthesis | Photosynthetic reaction center | Thermophilic cyanobacterium
