| MMDBr0036145 | L-Cysteine | 2-oxo-3-sulfanylpropanoic acid | L-amino acid dehydrogenase | Dehydrogenation | Not Available | 0 | 1 | RHEA |
| MMDBr0026143 | 3-Mercaptopyruvic acid | L-Cysteine | Ornithine aminotransferase | Amine group addition | Not Available | 0 | 38 | RHEA |
| MMDBr0026130 | L-Cysteine | D-Cysteine | Broad substrate specificity amino-acid racemase | Racemization | Not Available | 0 | 19 | RHEA |
| MMDBr0026060 | L-Cystine | L-Cysteine | Vitamin B12-dependent ribonucleoside-diphosphate reductase | Reduction | Not Available | 0 | 150 | RHEA |
| MMDBr0026059 | 2'-Deoxyadenosine 5'-diphosphate | L-Cysteine | Vitamin B12-dependent ribonucleoside-diphosphate reductase | Reduction | Not Available | 0 | 150 | RHEA |
| MMDBr0026058 | L-Cystine | L-Cysteine | Vitamin B12-dependent ribonucleoside-diphosphate reductase | Reduction | Not Available | 0 | 150 | RHEA |
| MMDBr0026057 | L-Cystine | L-Cysteine | Vitamin B12-dependent ribonucleoside-diphosphate reductase | Reduction | Not Available | 0 | 150 | RHEA |
| MMDBr0026029 | L-Cystine | L-Cysteine | Probable adenosylcobalamin-dependent ribonucleoside-triphosphate reductase | Reduction | Not Available | 0 | 12 | RHEA |
| MMDBr0026028 | L-Cystine | L-Cysteine | Probable adenosylcobalamin-dependent ribonucleoside-triphosphate reductase | Reduction | Not Available | 0 | 12 | RHEA |
| MMDBr0026027 | L-Cystine | L-Cysteine | Probable adenosylcobalamin-dependent ribonucleoside-triphosphate reductase | Reduction | Not Available | 0 | 12 | RHEA |
| MMDBr0026026 | L-Cystine | L-Cysteine | Probable adenosylcobalamin-dependent ribonucleoside-triphosphate reductase | Reduction | Not Available | 0 | 12 | RHEA |
| MMDBr0025930 | L-Cysteine | S-Adenosylhomocysteine | Cysteine S-methyltransferase OspZ | Methylation | Not Available | 0 | 4 | RHEA |
| MMDBr0025929 | L-Cysteine | S-Adenosylhomocysteine | Cysteine S-methyltransferase OspZ | Methylation | Not Available | 0 | 4 | RHEA |
| MMDBr0025790 | L-Cysteine | L-Cystine | Alkyl hydroperoxide reductase E | Reduction | Not Available | 0 | 3 | RHEA |
| MMDBr0025787 | L-Cysteine | L-Cystine | Peroxiredoxin PRX1, mitochondrial | Not Available | Not Available | 0 | 1 | RHEA |
| MMDBr0025786 | L-Cysteine | L-Cystine | Peroxiredoxin | Oxidation | Not Available | 0 | 127 | RHEA |
| MMDBr0025745 | L-Cysteine | 5'-Deoxyadenosine | Cysteine-type anaerobic sulfatase-maturating enzyme | Not Available | Not Available | 0 | 3 | RHEA |
| MMDBr0025639 | Adenosine triphosphate | L-Cysteine | tRNA-cytidine(32) 2-sulfurtransferase | Sulfuration | Not Available | 0 | 302 | RHEA |
| MMDBr0025638 | Adenosine triphosphate | L-Cysteine | tRNA-cytidine(32) 2-sulfurtransferase | Sulfuration | Not Available | 0 | 302 | RHEA |
| MMDBr0025621 | L-Cysteine | Hydrogen Ion | L-cysteine S-thiosulfotransferase subunit SoxA | Transfer of a L-cysteine S-thiosulfo group | Not Available | 0 | 10 | RHEA |
| MMDBr0025620 | L-Cysteine | Sn-Glycerol-1-phosphate | Phosphatidylglycerol--prolipoprotein diacylglyceryl transferase | Transfer of the diacylglyceryl group | Not Available | 0 | 536 | RHEA |
| MMDBr0025573 | L-Cysteine | Niacinamide | Thiamine thiazole synthase | Synthesis | Not Available | 0 | 28 | RHEA |
| MMDBr0025526 | L-Cysteine | pyridinium-3,5-bisthiocarboxylic acid mononucleotide | Pyridinium-3,5-bisthiocarboxylic acid mononucleotide synthase | Synthesis | Not Available | 0 | 1 | RHEA |
| MMDBr0025517 | L-Cysteine | pyridinium-3-carboxylic acid-5-thiocarboxylic acid mononucleotide | Pyridinium-3,5-bisthiocarboxylic acid mononucleotide synthase | Synthesis | Not Available | 0 | 1 | RHEA |
| MMDBr0025478 | L-Cysteine | Arsenite | Mycoredoxin 1 | Not Available | Not Available | 0 | 2 | RHEA |
