   2.6.1.3 | physiological function |
cystathionine beta-synthase, cysteine aminotransferase, and mercaptopyruvate sulfurtransferase, but not cystathionine gamma-lyase, are expressed in PC12 cells and the dorsal root ganglion, and appreciable amounts of H2S are produced from L-cysteine in the presence of alpha-ketoglutarate, together with dithiothreitol. The production of H2S is inhibited by cysteine aminotransferase inhibitor aminooxyacetic acid, and competitive cysteine aminotransferase substrates L-aspartate and oxaloacetate. The amount of H2S produced by cysteine aminotransferase/mercaptopyruvate sulfurtransferase at pH 8.0, a physiological mitochondrial matrix pH, is comparable to that produced by cystathionine beta-synthase and cystathionine beta-synthase in the liver and the brain, respectively |
738896 |
