title: Crystallization and preliminary crystallographic analysis of the ADP-ribosyltransferase HopU1.
abstract: Several Gram-negative pathogens of plants and animals and some eukaryotic associated bacteria use type III protein-secretion systems (T3SSs) to deliver bacterial virulence-associated ;effector' proteins directly into host cells. HopU1 is a type III effector protein from the plant pathogen Pseudomonas syringae, which causes plant bacterial speck disease. HopU1 quells host immunity through ADP-ribosylation of GRP7 as a substrate. HopU1 has been reported as the first ADP-ribosyltransferase virulence protein to be identified in a plant pathogen. Although several structures of ADP-ribosyltransferases have been determined to date, no structure of an ADP-ribosyltransferase from a plant pathogen has been determined. Here, the protein expression, purification, crystallization and preliminary crystallographic analysis of HopU1 are reported. Diffracting crystals were grown by hanging-drop vapour diffusion using polyethylene glycol 10,000 as a precipitant. Native and SAD data sets were collected using native and selenomethionine-derivative HopU1 crystals. The diffraction pattern of the crystal extended to 2.7 A resolution using synchrotron radiation. The crystals belonged to space group P4(3), with unit-cell parameters a=92.6, b=92.6, c=101.6 A.
authors.affiliation: School of Life Sciences, Fudan University, 220 Han-Dan Road, Shanghai 200433, People's Republic of China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Lin
authors.forename: Ping
authors.initials: P
authors.lastname: Wang
authors.forename: Huirong
authors.initials: H
authors.lastname: Yang
authors.forename: Yanhui
authors.initials: Y
authors.lastname: Xu
mesh_terms: D036002:ADP Ribose Transferases / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D044224:Pseudomonas syringae / Q000201:enzymology*
chemical_list: D036002:ADP Ribose Transferases