2pps

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Image:2pps.gif

2pps, resolution 4.0Å

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PHOTOSYNTHETIC REACTION CENTER AND CORE ANTENNA SYSTEM (TRIMERIC), ALPHA CARBON ONLY

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, ancestor.

About this Structure

2PPS is a Protein complex structure of sequences from Synechococcus elongatus with CLA, PQN and SF4 as ligands. This structure superseeds the now removed PDB entry 1PPS. Known structural/functional Site: . Full crystallographic information is available from OCA.

Reference

Photosystem I at 4 A resolution represents the first structural model of a joint photosynthetic reaction centre and core antenna system., Krauss N, Schubert WD, Klukas O, Fromme P, Witt HT, Saenger W, Nat Struct Biol. 1996 Nov;3(11):965-73. PMID:8901876

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