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

• OCSBF-1, a maize ocs enhancer binding factor: isolation and expression during development [1].
• The response of ocs elements to exogenous auxin began within 1 h [2].
• ocs element promoter sequences are activated by auxin and salicylic acid in Arabidopsis [2].
• Salicylic acid, a disease-resistance signal in plants, also increased ocs element activity in both roots and aerial parts of the plant [2].
• The question of whether the induction in ocs element activity is mediated through auxin and/or salicylic acid signal transduction pathways or is part of a more general stress response is discussed [2].

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].

References