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FEBS Lett. 2002 Aug 14;525(1-3):121-5.

Supramolecular organization of photosystem I and light-harvesting complex I in Chlamydomonas reinhardtii.

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  • 1Faculty of Sciences, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands.

Abstract

We report a structural characterization by electron microscopy and image analysis of a supramolecular complex consisting of photosystem I and light-harvesting complex I from the unicellular green alga Chlamydomonas reinhardtii. The complex is a monomer, has longest dimensions of 21.3 and 18.2 nm in projection, and is significantly larger than the corresponding complex in spinach. Comparison with photosystem I complexes from other organisms suggests that the complex contains about 14 light-harvesting proteins, two or three of which bind at the side of the PSI-H subunit. We suggest that special light-harvesting I proteins play a role in the binding of phosphorylated light-harvesting complex II in state 2.

PMID:
12163173
[PubMed - indexed for MEDLINE]
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