1c51

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spinqualitylabelsall models 1c51, resolution 4.0Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

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 CLA, PQN and SF4 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

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