Figure 1: Domain organization of T. thermophilus RRF in the ribosome4,5,6,7.
From: Crystal structure of the ribosome recycling factor bound to the ribosome

Domain I, comprising residues 1–29 and 107–185, forms a three-helix bundle (red). Domain II, formed by residues 34–102, has a three-layered β/α/β structure (blue), and its orientation relative to domain I is shown as it appears in the present complex with the 70S ribosome. Below, sequence of T. thermophilus RRF, with α-helices indicated.