| MMDBr0025620 | L-Cysteine | Sn-Glycerol-1-phosphate | Phosphatidylglycerol--prolipoprotein diacylglyceryl transferase | Transfer of the diacylglyceryl group | Not Available | 0 | 536 | RHEA |
| MMDBr0024605 | L-Cysteine | L-Cystine | Thiol:disulfide interchange protein DsbD | Transfer of electrons from cytoplasmic thioredoxin to the periplasm | Not Available | 0 | 53 | RHEA |
| MMDBr0024606 | L-Cysteine | L-Cystine | Thiol:disulfide interchange protein DsbD | Transfer of electrons from cytoplasmic thioredoxin to the periplasm | Not Available | 0 | 53 | RHEA |
| MMDBr0024964 | L-Cysteine | CoA | Palmitoyltransferase pfa3 | Transfer of a palmitoyl group | Not Available | 0 | 83 | 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 |
| MMDBr0018241 | Hydrogen sulfide | Acetic acid | Cysteine synthase A | Synthesis | Not Available | 0 | 1 | PathBank |
| MMDBr0018275 | L-Cysteine | Succinic acid | Cystathionine gamma-synthase | Synthesis | Not Available | 0 | 1 | PathBank |
| MMDBr0018359 | L-Cysteine | Cytidine monophosphate | Coenzyme A biosynthesis bifunctional protein CoaBC | Synthesis | Not Available | 0 | 1 | PathBank |
| MMDBr0018557 | Hydrogen sulfide | Acetic acid | Cysteine synthase A | Synthesis | Not Available | 0 | 1 | PathBank |
| MMDBr0019936 | Hydrogen sulfide | Acetic acid | Putative mitochondrial cysteine synthase | Synthesis | Not Available | 0 | 1 | PathBank |
| MMDBr0025517 | L-Cysteine | pyridinium-3-carboxylic acid-5-thiocarboxylic acid mononucleotide | Pyridinium-3,5-bisthiocarboxylic acid mononucleotide synthase | Synthesis | Not Available | 0 | 1 | RHEA |
| MMDBr0025526 | L-Cysteine | pyridinium-3,5-bisthiocarboxylic acid mononucleotide | Pyridinium-3,5-bisthiocarboxylic acid mononucleotide synthase | Synthesis | Not Available | 0 | 1 | RHEA |
| MMDBr0025573 | L-Cysteine | Niacinamide | Thiamine thiazole synthase | Synthesis | Not Available | 0 | 28 | RHEA |
| MMDBr0024692 | L-Cysteine | Hydrogen sulfide | 3-mercaptopyruvate sulfurtransferase | Sulfuration | Not Available | 0 | 4 | RHEA |
| MMDBr0024693 | L-Cysteine | Hydrogen sulfide | 3-mercaptopyruvate sulfurtransferase | Sulfuration | Not Available | 0 | 2 | RHEA |
| MMDBr0024770 | di-mu-Sulfido-diiron(1+) | L-Cysteine | Probable tRNA sulfurtransferase | Sulfuration | Not Available | 0 | 287 | RHEA |
| MMDBr0025638 | Adenosine triphosphate | L-Cysteine | tRNA-cytidine(32) 2-sulfurtransferase | Sulfuration | Not Available | 0 | 302 | RHEA |
| MMDBr0025639 | Adenosine triphosphate | L-Cysteine | tRNA-cytidine(32) 2-sulfurtransferase | Sulfuration | Not Available | 0 | 302 | RHEA |
| MMDBr0024392 | L-Cystine | L-Cysteine | Phosphoadenosine 5'-phosphosulfate reductase | Reduction | Not Available | 0 | 99 | RHEA |
| MMDBr0024397 | Acetyl phosphate | Betaine | Glycine/sarcosine/betaine reductase complex component A | Reduction | Not Available | 0 | 17 | RHEA |
| MMDBr0024410 | Acetyl phosphate | L-Cysteine | Glycine/sarcosine/betaine reductase complex component A | Reduction | Not Available | 0 | 22 | RHEA |
| MMDBr0024423 | L-Cystine | L-Cysteine | Probable adenosylcobalamin-dependent ribonucleoside-triphosphate reductase | Reduction | Not Available | 0 | 12 | RHEA |
| MMDBr0024428 | 5-Aminopentanoic acid | L-Cysteine | D-proline reductase proprotein PrdA | Reduction | Not Available | 0 | 2 | RHEA |
| MMDBr0024436 | Acetyl phosphate | L-Cysteine | Glycine/sarcosine/betaine reductase complex component A | Reduction | Not Available | 0 | 17 | RHEA |
| MMDBr0024471 | L-Methionine | L-Cysteine | Peptide methionine sulfoxide reductase MsrA | Reduction | Not Available | 0 | 308 | RHEA |
