Considering the in-vivo and in-vitro data presented in this work , the mechanism by which ArgP regulates argO transcription  , and the known capacity of Lrp to alter the shape of the DNA by inducing bending and wrapping  , a model for lysP regulation in which binding of Lrp to the lysP control region may favor and/or stabilize the ArgP-RNA polymerase-DNA complexes or introduce DNA conformational changes is conceivable .