3D Structure Determination of an Unstable Transient Enzyme Intermediate by Paramagnetic NMR Spectroscopy.
Jia-Liang ChenXiao WangFeng YangChan CaoGottfried OttingXun-Cheng SuPublished in: Angewandte Chemie (International ed. in English) (2016)
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.
Keyphrases
- magnetic resonance
- staphylococcus aureus
- molecular dynamics
- molecular dynamics simulations
- magnetic resonance imaging
- cerebral ischemia
- computed tomography
- emergency department
- escherichia coli
- pseudomonas aeruginosa
- hydrogen peroxide
- cystic fibrosis
- nitric oxide
- health information
- subarachnoid hemorrhage
- methicillin resistant staphylococcus aureus
- anaerobic digestion