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Structural basis for the glycosyltransferase activity of the Salmonella effector SseK3

DOI: 10.1074/jbc.RA118.001796 DOI Help

Authors: Diego Esposito (The Francis Crick Institute) , Regina A. Günster (Imperial College London) , Luigi Martino (The Francis Crick Institute) , Kamel El Omari (Diamond Light Source) , Armin Wagner (Diamond Light Source) , Teresa L. M. Thurston (Imperial College London) , Katrin Rittinger (The Francis Crick Institute)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Biological Chemistry

State: Published (Approved)
Published: February 2018
Diamond Proposal Number(s): 14493

Open Access Open Access

Abstract: The Salmonella secreted effector SseK3 translocates into host cells, targeting innate immune responses including NF-κB activation. SseK3 is a glycosyltransferase that transfers an N-acetylglucosamine (GlcNAc) moiety onto the guanidino group of a target arginine, modulating host cell function. However, a lack of structural information has precluded elucidation of the molecular mechanisms in arginine and GlcNAc selection. We report here the crystal structure of SseK3 in its apo form and in complex with hydrolysed UDP-GlcNAc. SseK3 possesses the typical glycosyltransferase type-A (GT-A)-family fold and the metal-coordinating DXD motif essential for ligand binding and enzymatic activity. Several conserved residues were essential for arginine-GlcNAcylation and SseK3-mediated inhibition of NF-κB activation. Isothermal titration calorimetry revealed SseK3’s preference for manganese coordination. The pattern of interactions in the substrate-bound SseK3 structure explained the selection of the primary ligand. Structural re-arrangement of the C-terminal residues upon ligand binding was crucial for SseK3’s catalytic activity and NMR analysis indicated that SseK3 has limited UDP-GlcNAc hydrolysis activity. The release of free N-acetyl α-D-glucosamine, and the presence of the same molecule in the SseK3 active site, classified it as a retaining glycosyltransferase. A glutamate residue in the active site suggested a double-inversion mechanism for the arginine N-glycosylation reaction. Homology models of SseK1, SseK2, and the Escherichia coli orthologue NleB1, reveal differences in the surface electrostatic charge distribution possibly accounting for their diverse activities. This first structure of a retaining GT-A arginine N-glycosyltransferase provides an important step towards a better understanding of this enzyme class and their roles as bacterial effectors.

Journal Keywords: bacterial effectors; UDP-GlcNAc; SseK3; arginine-modification; glycosyltransgerase type-A; protein structure; enzyme mechanism; Salmonella enterica; bacterial toxin; glycosyltransferase; X-ray crystallography

Diamond Keywords: Bacteria; Enzymes

Subject Areas: Biology and Bio-materials, Chemistry

Instruments: I23-Long wavelength MX

Added On: 19/02/2018 15:05


Discipline Tags:

Pathogens Infectious Diseases Health & Wellbeing Biochemistry Chemistry Structural biology Life Sciences & Biotech

Technical Tags:

Diffraction Macromolecular Crystallography (MX)