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Gene Review

PSAD-1  -  photosystem I subunit D-1

Arabidopsis thaliana

Synonyms: PSI-D
 
 
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High impact information on PSAD-1

  • Plants with reduced amounts of PSI-D became light-stressed even in low light although they exhibited high non-photochemical quenching (NPQ) [1].
  • Arabidopsis thaliana plants lacking the PSI-D subunit of photosystem I suffer severe photoinhibition, have unstable photosystem I complexes, and altered redox homeostasis in the chloroplast stroma [1].
  • The change in the thiol disulfide redox state might be fatal for the PSI-D-less plants, because reduction of thioredoxin is one of the main switches for the initiation of CO2 assimilation and photoprotection upon light exposure [1].
  • Photosystem I lacking PSI-F was less stable, and the stromal subunits PSI-C, PSI-D, and PSI-E were present in lower amounts than in wild type [2].
  • Increased dosage of PsaD2 in the psad1-1 background restores the WT phenotype, indicating that PSI-D1 and PSI-D2 have redundant functions [3].
 

Biological context of PSAD-1

  • The double mutant psad1-1 psad2-1 is seedling-lethal, high-chlorophyll-fluorescent and deficient for all tested PSI subunits, indicating that PSI-D is essential for photosynthesis [3].
  • The two isoforms of the psaD product have distinct amino acid sequences, indicating that they are encoded by different genes within the genome [4].
 

Associations of PSAD-1 with chemical compounds

  • The psaD, psaF, psaH, and psaL products have two isoforms each that are distinguished by different mobilities in polyacrylamide gel electrophoresis, and the psaE product has four isoforms [4].

References

 
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