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Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
Published on: September 23, 2021
3D Structure Determination of an Unstable Transient Enzyme Intermediate by Paramagnetic NMR Spectroscopy
Jia-Liang Chen1, Xiao Wang1, Feng Yang1
1State Key Laboratory of Elemento-Organic Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin, 300071, China.
Abstract:
Enzyme catalysis relies on conformational plasticity, but structural information on transient intermediates is difficult to obtain. We show that the three-dimensional (3D) structure of an unstable, low-abundance enzymatic intermediate can be determined by nuclear magnetic resonance (NMR) spectroscopy. The approach is demonstrated for Staphylococcus aureus sortase A (SrtA), which is an established drug target and biotechnological reagent. SrtA is a transpeptidase that converts an amide bond of a substrate peptide into a thioester. By measuring pseudocontact shifts (PCSs) generated by a site-specific cysteine-reactive paramagnetic tag that does not react with the active-site residue Cys184, a sufficient number of restraints were collected to determine the 3D structure of the unstable thioester intermediate of SrtA that is present only as a minor species under non-equilibrium conditions. The 3D structure reveals structural changes that protect the thioester intermediate against hydrolysis.
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