Structural highlights
FunctionCD123_HUMAN Required for S phase entry of the cell cycle. Publication Abstract from PubMedEukaryotic initiation factor 2 (eIF2) plays a key role in protein synthesis and in its regulation. The assembly of this heterotrimeric factor is facilitated by Cdc123, a member of the ATP grasp family that binds the gamma subunit of eIF2. Notably, some mutations related to MEHMO syndrome, an X-linked intellectual disability, affect Cdc123-mediated eIF2 assembly. The mechanism of action of Cdc123 is unclear and structural information for the human protein is awaited. Here, the crystallographic structure of human Cdc123 (Hs-Cdc123) bound to domain 3 of human eIF2gamma (Hs-eIF2gammaD3) was determined. The structure shows that the domain 3 of eIF2gamma is bound to domain 1 of Cdc123. In addition, the long C-terminal region of Hs-Cdc123 provides a link between the ATP and Hs-eIF2gammaD3 binding sites. A thermal shift assay shows that ATP is tightly bound to Cdc123 whereas the affinity of ADP is much smaller. Yeast cell viability experiments, western blot analysis and two-hybrid assays show that ATP is important for the function of Hs-Cdc123 in eIF2 assembly. These data and recent findings allow us to propose a refined model to explain the mechanism of action of Cdc123 in eIF2 assembly. Binding of human Cdc123 to eIF2gamma.,Cardenal Peralta C, Vandroux P, Neumann-Arnold L, Panvert M, Fagart J, Seufert W, Mechulam Y, Schmitt E J Struct Biol. 2023 Jul 27;215(3):108006. doi: 10.1016/j.jsb.2023.108006. PMID:37507029[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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