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Discovery of a Celecoxib Binding Site on Prostaglandin E Synthase (PTGES) with a Cleavable Chelation-Assisted Biotin Probe
- Source :
- ACS Chemical Biology. 14:2527-2532
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- The coxibs are a subset of nonsteroidal anti-inflammatory drugs (NSAIDs) that primarily target cyclooxygenase-2 (COX-2) to inhibit prostaglandin signaling and reduce inflammation. However, mechanisms to inhibit other members of the prostaglandin signaling pathway may improve selectivity and reduce off-target toxicity. Here, we report a novel binding site for celecoxib on prostaglandin E synthase (PTGES), which is an enzyme downstream of COX-2 in the prostaglandin signaling pathway, using a cleavable chelation-assisted biotin probe 6. Evaluation of the multifunctional probe 6 revealed significantly improved tagging efficiencies attributable to the embedded picolyl functional group. Application of the probe 6 within the small molecule interactome mapping by photoaffinity labeling (SIM-PAL) platform using photo-celecoxib as a reporter for celecoxib identified PTGES and other membrane proteins in the top eight enriched proteins from A549 cells. Four binding sites to photo-celecoxib were mapped by the probe 6, including a binding site with PTGES. The binding interaction with PTGES was validated by competitive displacement with celecoxib and licofelone, which is a known PTGES inhibitor, and was used to generate a structural model of the interaction. The identification of photo-celecoxib interactions with membrane proteins, including the direct binding site on the membrane protein PTGES, will inform further functional followup and the design of new selective inhibitors of the prostaglandin signaling pathway.
- Subjects :
- 0301 basic medicine
Biotin
Prostaglandin
Photoaffinity Labels
Prostaglandin E synthase
01 natural sciences
Biochemistry
03 medical and health sciences
chemistry.chemical_compound
Binding site
Chelating Agents
Prostaglandin-E Synthases
Binding Sites
Cyclooxygenase 2 Inhibitors
biology
Photoaffinity labeling
010405 organic chemistry
General Medicine
Small molecule
0104 chemical sciences
Cell biology
030104 developmental biology
chemistry
Membrane protein
Celecoxib
Molecular Probes
Prostaglandins
biology.protein
Molecular Medicine
lipids (amino acids, peptides, and proteins)
Signal transduction
Signal Transduction
Subjects
Details
- ISSN :
- 15548937 and 15548929
- Volume :
- 14
- Database :
- OpenAIRE
- Journal :
- ACS Chemical Biology
- Accession number :
- edsair.doi.dedup.....d23329efc8be92ef921d2652f1263119