title: A novel reversible thiol-specific spin label: papain active site labeling and inhibition.
mesh_terms: D001665:Binding Sites; D055598:Chemical Phenomena; D002621:Chemistry; D003497:Cyclic N-Oxides / Q000138:chemical synthesis*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D004789:Enzyme Activation; D006863:Hydrogen-Ion Concentration; D008698:Mesylates; D010206:Papain / Q000032:analysis* / Q000037:antagonists & inhibitors; D013113:Spin Labels / Q000138:chemical synthesis*; D013438:Sulfhydryl Compounds / Q000032:analysis*
chemical_list: D003497:Cyclic N-Oxides; D008698:Mesylates; D013113:Spin Labels; D013438:Sulfhydryl Compounds; C034248:(1-oxyl-2,2,5,5-tetramethylpyrroline-3-methyl)methanethiosulfonate; D010206:Papain