1.1.1.184 additional information in presence of S-nitrosoglutathione, S-glutathionylation of cysteines at positions 122, 150, 226, 227 occurs. GSNO treatment of CBR1 results in a 2–5-fold decrease in kcat with menadione, 4-benzoylpyridine, 2,3-hexanedione, daunorubicin and 1,4-naphthoquinone and an increased kcat for substrates containing a 1,2-diketo group in a ring structure such as 1,2-naphthoquinone, 9,10-phenanthrenequinone, isatin 724718 1.1.1.184 additional information presence of a disulfide bond between neighboring residues Cys226 and Cys227 724718