title: Crystal structure of type VI effector Tse1 from Pseudomonas aeruginosa.
abstract: The type VI secretion systems (T6SS) have emerging roles in interspecies competition. In order to have an advantage in defense against other organisms, this system in Pseudomonas aeruginosa delivers a peptidoglycan amidase (Tse1) to the periplasmic space of a competitor. An immune protein (Tsi1) is also produced by the bacterium to protect itself from damage caused by Tse1. Tsi1 directly interacts with Tse1. We report that the crystal structure of Tse1 displays a common CHAP protein fold. Strikingly, our structures showed that the third residue in the catalytic triad may be novel as this residue type has not been observed previously.
authors: State Key Laboratory of Protein and Plant Gene Research, and Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing 100871, China.
authors: Heng
authors: H
authors: Zhang
authors: Zeng-Qiang
authors: ZQ
authors: Gao
authors: Xiao-Dong
authors: XD
authors: Su
authors: Yu-Hui
authors: YH
authors: Dong
mesh_terms: D000581:Amidohydrolases / Q000737:chemistry* / Q000235:genetics; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics; D058947:Bacterial Secretion Systems / Q000235:genetics; D001483:Base Sequence; D018360:Crystallography, X-Ray; D004269:DNA, Bacterial / Q000235:genetics; D008024:Ligands; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D011550:Pseudomonas aeruginosa / Q000737:chemistry* / Q000235:genetics; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D055672:Static Electricity
chemical_list: D001426:Bacterial Proteins; D058947:Bacterial Secretion Systems; D004269:DNA, Bacterial; D008024:Ligands; D011994:Recombinant Proteins; D000581:Amidohydrolases