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Gene Review

LHCA2  -  photosystem I light harvesting complex...

Arabidopsis thaliana

Synonyms: LHCI-680, photosystem I light harvesting complex gene 2
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High impact information on LHCA2

  • We report a detailed characterization of the Lhca2 subunit using molecular biology, biochemistry, and spectroscopy and show that the 701-nm emission form originates from a broad absorption band at 690 nm [1].
  • Furthermore, thylakoids and isolated PSI without PSI-K had 20-30% less Lhca2 and 30-40% less Lhca3, whereas Lhca1 and Lhca4 were unaffected [2].
  • Levels of light-harvesting complex I proteins in plants, which lack simultaneously PSI-G and -K, indicate that PSI subunits other than G and K can also bind Lhca2 and 3 [3].
  • The results indicate that Lhca2/3 and Lhca1/4 each provides about equally effective energy transfer routes to the PSI core complex, and that Lhca5 provides a less effective energy transfer route [4].
  • The interdependence of levels of PSI-C, -D and -E, of -H and -L, and of Lhca2 and 3, which was previously proposed based on the study of single genotypes or on cross-linking experiments, was confirmed by our analyses [5].


  1. Origin of the 701-nm fluorescence emission of the Lhca2 subunit of higher plant photosystem I. Croce, R., Morosinotto, T., Ihalainen, J.A., Chojnicka, A., Breton, J., Dekker, J.P., van Grondelle, R., Bassi, R. J. Biol. Chem. (2004) [Pubmed]
  2. The PSI-K subunit of photosystem I is involved in the interaction between light-harvesting complex I and the photosystem I reaction center core. Jensen, P.E., Gilpin, M., Knoetzel, J., Scheller, H.V. J. Biol. Chem. (2000) [Pubmed]
  3. Single and double knockouts of the genes for photosystem I subunits G, K, and H of Arabidopsis. Effects on photosystem I composition, photosynthetic electron flow, and state transitions. Varotto, C., Pesaresi, P., Jahns, P., Lessnick, A., Tizzano, M., Schiavon, F., Salamini, F., Leister, D. Plant Physiol. (2002) [Pubmed]
  4. Excitation energy trapping in photosystem I complexes depleted in Lhca1 and Lhca4. Ihalainen, J.A., Klimmek, F., Ganeteg, U., van Stokkum, I.H., van Grondelle, R., Jansson, S., Dekker, J.P. FEBS Lett. (2005) [Pubmed]
  5. Protein-protein and protein-function relationships in Arabidopsis photosystem I: cluster analysis of PSI polypeptide levels and photosynthetic parameters in PSI mutants. Pesaresi, P., Varotto, C., Richly, E., Lessnick, A., Salamini, F., Leister, D. J. Plant Physiol. (2003) [Pubmed]
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