Common Hydrogen Bond Interactions in Diverse Phosphoryl Transfer Active Sites
Figure 5
Hyperconjugation in methyl triphosphate, a model for ATP.
Electron density is transferred from a lone pair orbital on one of the γ-oxygens (Oγ), into the antibonding orbital (σ*) of the O3β—Pγ bond. Red lettering indicates the atoms involved in the hyperconjugative interaction and the red arrow represents electron density transfer.