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Gene Review

petB  -  cytochrome B6

Synechocystis sp. PCC 6803

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Disease relevance of petB

  • The gene encoding the cytochrome b6 subunit (petB) of the cytochrome b6f complex has been isolated, cloned and sequenced by nonradioactive methods from genomic DNA of the unicellular cyanobacterium Synechocystis sp. PCC 6803 [1].

High impact information on petB

  • In striking contrast, in the genomes of plant chloroplasts, psbH is cotranscribed with petB and petD, encoding the other two major subunits of the cytochrome b6-f complex [2].
  • Further fractionation of monomeric complexes by mild gel electrophoresis in the presence of sodium dodecyl sulfate indicated that it is the cytochrome b6 polypeptide which provides the actual binding site for the chlorophyll molecule observed in the complex [3].
  • The transcript level of the photosynthetic genes psbA, psaA and petB was found to be different in the hydrogenase-free mutant cells compared to wild-type cells, which indicates that the hydrogenase has an effect on the regulation of these genes [4].
  • Nucleotide sequence of the petB gene encoding cytochrome b6 from the mesophilic cyanobacterium Synechocystis PCC 6803: implications for evolution and function [1].

Analytical, diagnostic and therapeutic context of petB

  • Two of them, with molecular masses of 240+/-20 and 110+/-15 kDa respectively, showed peroxidase activity and, by means of polypeptide composition, immunoblotting and N-terminal sequencing, were identified as dimeric and monomeric cytochrome b6/f complexes, containing 1.3+/-0.35 chlorophyll molecules per cytochrome f [3].


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