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Gene Review

ocs  -  hypothetical protein

Agrobacterium tumefaciens

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Disease relevance of ocs

  • The ocs-elements comprise a family of related 20-base pair DNA sequences with dyad symmetry that are functional components of the promoters of several genes introduced into the plant nucleus by Agrobacterium transformation or infection by DNA viruses [1].
  • ocs elements are a group of promoter elements that have been exploited by two distinct groups of plant pathogens, Agrobacterium and certain viruses, to express genes in plants [2].

High impact information on ocs


Chemical compound and disease context of ocs

  • Our results indicate that treatment of plants with SA increases ASF-1 binding to as-1 and to ocs, an as-1-like element from the Agrobacterium octopine synthase gene [3].

Biological context of ocs

  • The mutants exhibit similar phenotypes in protoplasts of both tobacco and maize, implying conservation of the DNA-protein interactions of the ocs enhancer sequence in monocotyledonous and dicotyledonous plants [4].
  • The apparent rarity of the ocs-element in plant genes contrasts with its frequent use by pathogens that transform the plant nucleus [5].
  • Two adjacent and functionally identical protein-binding sites separated by an exact number of nucleotides are required for in vivo activity of the ocs-element [5].
  • The genes, called OBF4 and OBF5, were isolated by screening an Arabidopsis genomic library with degenerate oligonucleotides complementary to the DNA-binding domains of other plant ocs-element-binding proteins [6].


  1. OCSBF-1, a maize ocs enhancer binding factor: isolation and expression during development. Singh, K., Dennis, E.S., Ellis, J.G., Llewellyn, D.J., Tokuhisa, J.G., Wahleithner, J.A., Peacock, W.J. Plant Cell (1990) [Pubmed]
  2. ocs element promoter sequences are activated by auxin and salicylic acid in Arabidopsis. Zhang, B., Singh, K.B. Proc. Natl. Acad. Sci. U.S.A. (1994) [Pubmed]
  3. Phosphorylation of nuclear proteins directs binding to salicylic acid-responsive elements. Stange, C., Ramírez, I., Gómez, I., Jordana, X., Holuigue, L. Plant J. (1997) [Pubmed]
  4. Saturation mutagenesis of the octopine synthase enhancer: correlation of mutant phenotypes with binding of a nuclear protein factor. Singh, K., Tokuhisa, J.G., Dennis, E.S., Peacock, W.J. Proc. Natl. Acad. Sci. U.S.A. (1989) [Pubmed]
  5. Does the ocs-element occur as a functional component of the promoters of plant genes? Ellis, J.G., Tokuhisa, J.G., Llewellyn, D.J., Bouchez, D., Singh, K., Dennis, E.S., Peacock, W.J. Plant J. (1993) [Pubmed]
  6. Isolation and characterization of two related Arabidopsis ocs-element bZIP binding proteins. Zhang, B., Foley, R.C., Singh, K.B. Plant J. (1993) [Pubmed]
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