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Gene Review

cob  -  apocytochrome B

Arabidopsis thaliana

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High impact information on cob

  • Quantitative polarized-light and field-emission scanning electron microscopy reveal that loss of anisotropic expansion in cob mutants is accompanied by disorganization of the orientation of cellulose microfibrils and subsequent reduction of crystalline cellulose [1].
  • Novel RNA editing sites were identified in grapevine cob, which have not been previously reported for other plants [2].
  • This report presents the sequences of the grapevine (Vitis vinifera L.) mitochondrial gene for apocytochrome b (cob), the edited mRNA and the deduced protein [2].
  • The rpl5 gene, the rps14 pseudogene, and the cob gene are separated by one nucleotide and a 1604-nucleotide-long spacer respectively [3].
  • The entire region is transcribed into a 5-kb transcript, containing the rps14 pseudogene and the cob gene [3].


  1. COBRA, an Arabidopsis extracellular glycosyl-phosphatidyl inositol-anchored protein, specifically controls highly anisotropic expansion through its involvement in cellulose microfibril orientation. Roudier, F., Fernandez, A.G., Fujita, M., Himmelspach, R., Borner, G.H., Schindelman, G., Song, S., Baskin, T.I., Dupree, P., Wasteneys, G.O., Benfey, P.N. Plant Cell (2005) [Pubmed]
  2. Editing of the grapevine mitochondrial cytochrome b mRNA and molecular modeling of the protein. Islas-Osuna, M.A., Silva-Moreno, B., Caceres-Carrizosa, N., García-Robles, J.M., Sotelo-Mundo, R.R., Yepiz-Plascencia, G.M. Biochimie (2006) [Pubmed]
  3. An rps14 pseudogene is transcribed and edited in Arabidopsis mitochondria. Brandt, P., Unseld, M., Eckert-Ossenkopp, U., Brennicke, A. Curr. Genet. (1993) [Pubmed]
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