Chem 273, 27146-27153. The three dimensional structure of trp RNA-binding attenuation protein. Nature 374, 693-700. Model of transcription attenuation of the B. subtilis trp operon. Large boxed letters designate the complementary strands of the terminator and antiterminator RNA structures.
Numbers indicate the residue positions relative to the start of transcription.
Nucleotides 108-111 overlap between the antiterminator and terminator structures and are shown as outlined letters. The TRAP protein is represented as an 11 segmented ring and the bound RNA is shown forming a matching circle upon binding to TRAP with each triplet repeat interacting with one subunit. Each subunit is shown as a different color. The eleven bound tryptophan molecules are shown as van der Waals spheres. The 11 bound L-tryptophan molecules are shown in van der Waals spheres.