Figure 6.

Characteristic switch residues shift upon phosphorylation in CheY. A: Apo orientation (PDB 3CHY). B: ${\text{BeF}}_3^{-}$ bound orientation (PDB 1FQW). Thr87 has shifted to form a hydrogen bond with Asp57. Tyr106 has rotamerized inwards into the hydrophobic pocket. C: A sample candidate structure of phosphorylated CheY demonstrates near‐identical orientations to the ${\text{BeF}}_3^{-}$ bound crystal.