Structure of the RNA polymerase core-binding domain of sigma(54) reveals a likely conformational fracture point.

Structure Of The Core Binding Domain Of Sigma54

RNA polymerase sigma factor RpoN [Aquifex aeolicus VF5]

RNA polymerase sigma-54 factor [Aquifex aeolicus]

Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax