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. 2006 Mar 9;34(5):1450–1458. doi: 10.1093/nar/gkl015

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© The Author 2006. Published by Oxford University Press. All rights reserved

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Model of seven Δ19ω₂-bound heptads (→→→→→←←) of the natural promoter Pδ. (A) DNA in space filling and Δ19ω₂ as orange/red ribbons, (B) DNA in stick and Δ19ω₂ in surface representation colored according to electrostatic potential (negative and positive charges red and blue, respectively). The model is based on the structures of [Δ19ω₂]₂-(→→) and [Δ19ω₂]₂-(→←). Repressors form a left-handed protein-matrix winding around the nearly straight operator.