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Gene Review

psaA  -  PSI P700 apoprotein A1

Arabidopsis thaliana

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High impact information on psaA

  • In vivo labeling experiments and analyses of polysome association suggest that translational elongation of the PSI transcripts psaA and psaB is specifically arrested in the mutant [1].
  • Real-time reverse transcription (RT)-PCR analysis has successfully been applied to quantify defined intervals of the tricistronic transcript and it was established that the psaA region is less stable than the rps14 region in hcf145 [2].
  • The PSI-LHCII complex could be averaged with a resolution of 16 A, showing that LHCII has a specific binding site at the PSI-A, -H, -L, and -K subunits [3].
  • However, certain cpDNA sequences, including the central portion of the rbcL gene and the 3' end of the psaA gene, are shared by all six crucifer mtDNAs and appear to have been transferred in a common ancestor of the crucifer family over 30 million years ago [4].
  • Furthermore, the 11 identified regions of transferred DNA, which include the 5' end of the chloroplast psaA gene and the central segment of rpoB, have the same mtDNA locations in these three species [4].

Other interactions of psaA

  • Especially for psaA and psaB, the complex analysis demonstrated that the assumed PQ-dependent redox control is subordinate to signals linked to the relative availability of 3-PGA and DHAP, which define the assimilatory force [5].


  1. ACCUMULATION OF PHOTOSYSTEM ONE1, a member of a novel gene family, is required for accumulation of [4Fe-4S] cluster-containing chloroplast complexes and antenna proteins. Amann, K., Lezhneva, L., Wanner, G., Herrmann, R.G., Meurer, J. Plant Cell (2004) [Pubmed]
  2. The nuclear factor HCF145 affects chloroplast psaA-psaB-rps14 transcript abundance in Arabidopsis thaliana. Lezhneva, L., Meurer, J. Plant J. (2004) [Pubmed]
  3. Structural characterization of a complex of photosystem I and light-harvesting complex II of Arabidopsis thaliana. Kouril, R., Zygadlo, A., Arteni, A.A., de Wit, C.D., Dekker, J.P., Jensen, P.E., Scheller, H.V., Boekema, E.J. Biochemistry (2005) [Pubmed]
  4. Location, identity, amount and serial entry of chloroplast DNA sequences in crucifer mitochondrial DNAs. Nugent, J.M., Palmer, J.D. Curr. Genet. (1988) [Pubmed]
  5. Regulation of gene expression by photosynthetic signals triggered through modified CO2 availability. Wormuth, D., Baier, M., Kandlbinder, A., Scheibe, R., Hartung, W., Dietz, K.J. BMC Plant Biol. (2006) [Pubmed]
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