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Gene Review

petB  -  cytochrome b6

Chlamydomonas reinhardtii

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Disease relevance of petB


High impact information on petB


Biological context of petB


Anatomical context of petB


Associations of petB with chemical compounds

  • This gene modification mimics the presence of proline codons at the same position in the petB genes of maize and tobacco, which are subsequently edited to leucine codons at the RNA level [12].
  • The loss of cytochrome b6/f complexes during gametogenesis is prevented by the addition of cycloheximide, but is chloramphenicol insensitive [8].
  • The light-induced turnover of the D1 protein subunit of reaction center II (RCII) was investigated in Chlamydomonas reinhardtii y-1 (control) and D6, AC208, and B4 mutants lacking cytochrome b6/f, plastocyanin or photosystem I activity, respectively, and, thus, impaired in light-dependent plastoquinol (PQH2) oxidation [13].
  • Thin three-dimensional crystals of the cytochrome b6 f complex from the unicellular algae Chlamydomonas reinhardtii have been grown by BioBeads-mediated detergent removal from a mixture of protein and lipid solubilized in Hecameg [14].
  • Function-directed mutagenesis of the cytochrome b6f complex in Chlamydomonas reinhardtii: involvement of the cd loop of cytochrome b6 in quinol binding to the Q(o) site [15].

Physical interactions of petB


Other interactions of petB

  • At variance with the pet genes in higher plant chloroplasts, the petB and petD genes are continuous, not adjacent and not located next to the psbB gene [17].
  • The resulting homoplasmic petG deletion strains are unable to grow photosynthetically, and immunoblot analysis shows markedly decreased levels of cytochrome b6, cytochrome f, the Rieske iron-sulfur protein, and subunit IV [18].
  • Biochemical comparison of the proline-containing transformants with a cytochrome b6 mutant deficient in heme-attachment indicates that their primary defect is at the level of assembly of apocytochrome b6 with the bh heme, thereby preventing assembly of the whole cytochrome b6f complex [12].

Analytical, diagnostic and therapeutic context of petB


  1. Cytochrome b6 arginine 214 of Synechococcus sp. PCC 7002, a key residue for quinone-reductase site function and turnover of the cytochrome bf complex. Nelson, M.E., Finazzi, G., Wang, Q.J., Middleton-Zarka, K.A., Whitmarsh, J., Kallas, T. J. Biol. Chem. (2005) [Pubmed]
  2. The assembly of cytochrome b6/f complexes: an approach using genetic transformation of the green alga Chlamydomonas reinhardtii. Kuras, R., Wollman, F.A. EMBO J. (1994) [Pubmed]
  3. Initiation codon mutations in the Chlamydomonas chloroplast petD gene result in temperature-sensitive photosynthetic growth. Chen, X., Kindle, K., Stern, D. EMBO J. (1993) [Pubmed]
  4. Lateral redistribution of cytochrome b6/f complexes along thylakoid membranes upon state transitions. Vallon, O., Bulte, L., Dainese, P., Olive, J., Bassi, R., Wollman, F.A. Proc. Natl. Acad. Sci. U.S.A. (1991) [Pubmed]
  5. Nucleotide sequence of the frxC, petB and trnL genes in the chloroplast genome of Chlamydomonas reinhardtii. Huang, C., Liu, X.Q. Plant Mol. Biol. (1992) [Pubmed]
  6. Microarray analysis confirms the specificity of a Chlamydomonas reinhardtii chloroplast RNA stability mutant. Erickson, B., Stern, D.B., Higgs, D.C. Plant Physiol. (2005) [Pubmed]
  7. Post-transcriptional defects in tobacco chloroplast mutants lacking the cytochrome b6/f complex. Monde, R.A., Zito, F., Olive, J., Wollman, F.A., Stern, D.B. Plant J. (2000) [Pubmed]
  8. Evidence for a selective destabilization of an integral membrane protein, the cytochrome b6/f complex, during gametogenesis in Chlamydomonas reinhardtii. Bulté, L., Wollman, F.A. Eur. J. Biochem. (1992) [Pubmed]
  9. Molecular genetic identification of a pathway for heme binding to cytochrome b6. Kuras, R., de Vitry, C., Choquet, Y., Girard-Bascou, J., Culler, D., Büschlen, S., Merchant, S., Wollman, F.A. J. Biol. Chem. (1997) [Pubmed]
  10. Chlororespiration: an adaptation to nitrogen deficiency in Chlamydomonas reinhardtii. Peltier, G., Schmidt, G.W. Proc. Natl. Acad. Sci. U.S.A. (1991) [Pubmed]
  11. Extensive accumulation of an extracellular L-amino-acid oxidase during gametogenesis of Chlamydomonas reinhardtii. Vallon, O., Bulté, L., Kuras, R., Olive, J., Wollman, F.A. Eur. J. Biochem. (1993) [Pubmed]
  12. Mutations of cytochrome b6 in Chlamydomonas reinhardtii disclose the functional significance for a proline to leucine conversion by petB editing in maize and tobacco. Zito, F., Kuras, R., Choquet, Y., Kössel, H., Wollman, F.A. Plant Mol. Biol. (1997) [Pubmed]
  13. Role of plastoquinol oxidoreduction in regulation of photochemical reaction center IID1 protein turnover in vivo. Zer, H., Prasil, O., Ohad, I. J. Biol. Chem. (1994) [Pubmed]
  14. The 9 A projection structure of cytochrome b6f complex determined by electron crystallography. Bron, P., Lacapère, J.J., Breyton, C., Mosser, G. J. Mol. Biol. (1999) [Pubmed]
  15. Function-directed mutagenesis of the cytochrome b6f complex in Chlamydomonas reinhardtii: involvement of the cd loop of cytochrome b6 in quinol binding to the Q(o) site. Finazzi, G., Büschlen, S., de Vitry, C., Rappaport, F., Joliot, P., Wollman, F.A. Biochemistry (1997) [Pubmed]
  16. On the presence and role of a molecule of chlorophyll a in the cytochrome b6 f complex. Pierre, Y., Breyton, C., Lemoine, Y., Robert, B., Vernotte, C., Popot, J.L. J. Biol. Chem. (1997) [Pubmed]
  17. Nucleotide sequences of the continuous and separated petA, petB and petD chloroplast genes in Chlamydomonas reinhardtii. Büschlen, S., Choquet, Y., Kuras, R., Wollman, F.A. FEBS Lett. (1991) [Pubmed]
  18. The deletion of petG in Chlamydomonas reinhardtii disrupts the cytochrome bf complex. Berthold, D.A., Schmidt, C.L., Malkin, R. J. Biol. Chem. (1995) [Pubmed]
  19. Projection map of cytochrome b6 f complex at 8 A resolution. Mosser, G., Breyton, C., Olofsson, A., Popot, J.L., Rigaud, J.L. J. Biol. Chem. (1997) [Pubmed]
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