4u04 | pdb_00004u04
Structure of a eukaryotic fic domain containing protein
Structural highlights
Function[FICD_HUMAN] Adenylyltransferase that mediates the addition of adenosine 5'-monophosphate (AMP) to specific residues of target proteins. Able to inactivate Rho GTPases in vitro by adding AMP to RhoA, Rac and Cdc42. It is however unclear whether it inactivates GTPases in vivo and physiological substrates probably remain to be identified.[1] [2] Publication Abstract from PubMedProtein AMPylation, the transfer of AMP from ATP to protein targets, has been recognized as a new mechanism of host-cell disruption by some bacterial effectors that typically contain a FIC-domain. Eukaryotic genomes also encode one FIC-domain protein, HYPE, which has remained poorly characterized. Here we describe the structure of human HYPE, solved by X-ray crystallography, representing the first structure of a eukaryotic FIC-domain protein. We demonstrate that HYPE forms stable dimers with structurally and functionally integrated FIC-domains and with TPR-motifs exposed for protein-protein interactions. As HYPE also uniquely possesses a transmembrane helix, dimerization is likely to affect its positioning and function in the membrane vicinity. The low rate of autoAMPylation of the wild-type HYPE could be due to autoinhibition, consistent with the mechanism proposed for a number of putative FIC AMPylators. Our findings also provide a basis to further consider possible alternative cofactors of HYPE and distinct modes of target-recognition. Crystal Structure of the Human, FIC-Domain Containing Protein HYPE and Implications for Its Functions.,Bunney TD, Cole AR, Broncel M, Esposito D, Tate EW, Katan M Structure. 2014 Nov 25. pii: S0969-2126(14)00334-7. doi:, 10.1016/j.str.2014.10.007. PMID:25435325[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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