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Gene Review

PETC  -  cytochrome b6-f complex iron-sulfur subunit

Arabidopsis thaliana

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High impact information on PETC

  • To assess whether ferredoxin (Fd) donates electrons directly to plastoquinone (PQ) or via a Q-cycle in the cytochrome (cyt) b(6)f complex in PSI cyclic electron transport, we characterized the activity of PSI cyclic electron transport in an Arabidopsis mutant, pgr1 (proton gradient regulation) [1].
  • In pgr1, Q-cycle activity was hypersensitive to acidification of the thylakoid lumen because of an amino acid alteration in the Rieske subunit of the cyt b(6)f complex, resulting in a conditional defect in Q-cycle activity [1].
  • All the results indicated that the pgr1 mutation did not affect PGR5-dependent PQ reduction by Fd [1].
  • In contrast to the pgr5 defect, the pgr1 defect did not show any synergistic effect on the quantum yield of photosystem II in crr2-2, a mutant in which NDH (NAD(P)H dehydrogenase) activity was impaired [1].
  • Map-based cloning showed that pgr1 had a point mutation in petC encoding the Rieske subunit of the cytochrome b(6)f complex [2].

Biological context of PETC

  • The photosynthetic electron transport chain (PETC) is the principal place of appearance of reactive oxygen species (ROS) in plants under illumination [3].
  • We showed that pgr1 was sensitive to changes in light conditions, demonstrating that maximum activity of the cytochrome b(6)f complex is indispensable for short-term acclimation [2].
  • The amino acid sequence of CAO predicts mononuclear iron and Rieske iron-sulfur centers in the protein [4].

Anatomical context of PETC


Associations of PETC with chemical compounds


Other interactions of PETC


  1. The pgr1 mutation in the Rieske subunit of the cytochrome b6f complex does not affect PGR5-dependent cyclic electron transport around photosystem I. Okegawa, Y., Tsuyama, M., Kobayashi, Y., Shikanai, T. J. Biol. Chem. (2005) [Pubmed]
  2. Cytochrome b(6)f mutation specifically affects thermal dissipation of absorbed light energy in Arabidopsis. Munekage, Y., Takeda, S., Endo, T., Jahns, P., Hashimoto, T., Shikanai, T. Plant J. (2001) [Pubmed]
  3. Participation of photosynthetic electron transport in production and scavenging of reactive oxygen species. Ivanov, B., Khorobrykh, S. Antioxid. Redox Signal. (2003) [Pubmed]
  4. Synthesis of chlorophyll b: localization of chlorophyllide a oxygenase and discovery of a stable radical in the catalytic subunit. Eggink, L.L., LoBrutto, R., Brune, D.C., Brusslan, J., Yamasato, A., Tanaka, A., Hoober, J.K. BMC Plant Biol. (2004) [Pubmed]
  5. Single point mutation in the Rieske iron-sulfur subunit of cytochrome b6/f leads to an altered pH dependence of plastoquinol oxidation in Arabidopsis. Jahns, P., Graf, M., Munekage, Y., Shikanai, T. FEBS Lett. (2002) [Pubmed]
  6. 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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