6b7o

Crystal structure of Legionella effector sdeD (lpg2509) H67A in complex with ADP-ribosylated Ubiquitin

spinqualitylabelsall models 6b7o, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6b7o is a 3 chain structure with sequence from Homo sapiens and Legionella pneumophila. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.85Å Ligands: AR6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q5ZSK8_LEGPH Publication Abstract from PubMed Ubiquitination is a post-translational modification that regulates many cellular processes in eukaryotes(1-4). The conventional ubiquitination cascade culminates in a covalent linkage between the C terminus of ubiquitin (Ub) and a target protein, usually on a lysine side chain(1,5). Recent studies of the Legionella pneumophila SidE family of effector proteins revealed a ubiquitination method in which a phosphoribosyl ubiquitin (PR-Ub) is conjugated to a serine residue on substrates via a phosphodiester bond(6-8). Here we present the crystal structure of a fragment of the SidE family member SdeA that retains ubiquitination activity, and determine the mechanism of this unique post-translational modification. The structure reveals that the catalytic module contains two distinct functional units: a phosphodiesterase domain and a mono-ADP-ribosyltransferase domain. Biochemical analysis shows that the mono-ADP-ribosyltransferase domain-mediated conversion of Ub to ADP-ribosylated Ub (ADPR-Ub) and the phosphodiesterase domain-mediated ligation of PR-Ub to substrates are two independent activities of SdeA. Furthermore, we present two crystal structures of a homologous phosphodiesterase domain from the SidE family member SdeD (9) in complexes with Ub and ADPR-Ub. The structures suggest a mechanism for how SdeA processes ADPR-Ub to PR-Ub and AMP, and conjugates PR-Ub to a serine residue in substrates. Our study establishes the molecular mechanism of phosphoribosyl-linked ubiquitination and will enable future studies of this unusual type of ubiquitination in eukaryotes. Mechanism of phosphoribosyl-ubiquitination mediated by a single Legionella effector.,Akturk A, Wasilko DJ, Wu X, Liu Y, Zhang Y, Qiu J, Luo ZQ, Reiter KH, Brzovic PS, Klevit RE, Mao Y Nature. 2018 May;557(7707):729-733. doi: 10.1038/s41586-018-0147-6. Epub 2018 May, 23. PMID:29795346 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also 3D structures of ubiquitin

Proteopedia Page Contributors and Editors (what is this?)

OCA