1QZV

Crystal structure of plant photosystem I

Summary for 1QZV

• Entry DOI: 10.2210/pdb1qzv/pdb
• Descriptor: PLANT PHOTOSYSTEM I: SUBUNIT PSAA, PLANT PHOTOSYSTEM I: SUBUNIT PSAJ, PLANT PHOTOSYSTEM I: SUBUNIT PSAK, ... (19 entities in total)
• Functional Keywords: photosynthesis, plant photosynthetic reaction center, peripheral antenna, light-harvesting system, plant membrane protein complex
• Biological source: Pisum sativum (pea); More
• Total number of polymer chains: 32
• Total formula weight: 771330.96

Authors

Ben-Shem, A.,Frolow, F.,Nelson, N. (deposition date: 2003-09-18, release date: 2004-01-06, Last modification date: 2024-02-14)

Primary citation

Ben-Shem, A.,Frolow, F.,Nelson, N.
Crystal structure of plant photosystem I.
Nature, 426:630-635, 2003

PubMed Abstract: Oxygenic photosynthesis is the principal producer of both oxygen and organic matter on Earth. The conversion of sunlight into chemical energy is driven by two multisubunit membrane protein complexes named photosystem I and II. We determined the crystal structure of the complete photosystem I (PSI) from a higher plant (Pisum sativum var. alaska) to 4.4 A resolution. Its intricate structure shows 12 core subunits, 4 different light-harvesting membrane proteins (LHCI) assembled in a half-moon shape on one side of the core, 45 transmembrane helices, 167 chlorophylls, 3 Fe-S clusters and 2 phylloquinones. About 20 chlorophylls are positioned in strategic locations in the cleft between LHCI and the core. This structure provides a framework for exploration not only of energy and electron transfer but also of the evolutionary forces that shaped the photosynthetic apparatus of terrestrial plants after the divergence of chloroplasts from marine cyanobacteria one billion years ago.

PubMed: 14668855
DOI: 10.1038/nature02200

Experimental method

X-RAY DIFFRACTION (4.44 Å)