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Eukaryotic translation initiation factor 4G (eIF4G) plays a crucial role in translation initiation, serving as a scaffolding protein binding several other initiation factors, other proteins, and RNA. Binding of eIF4G to the ATP-dependent RNA helicase eukaryotic translation initiation factor 4A (eIF4A) enhances the activity of eIF4A in solution and in crowded environments. Previously, this activity enhancement was solely attributed to eIF4G, conferring a closed, active conformation upon eIF4A. Here we show that eIF4G contains a low-affinity binding site at the entrance to the ATP-binding cleft on eIF4A, suggesting that regulation of the local ATP concentration may be an additional reason for the enhancement in activity.

Human Translation Initiation Factor eIF4G1 Possesses a Low-Affinity ATP Binding Site Facing the ATP-Binding Cleft of eIF4A in the eIF4G/eIF4A Complex