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Your translated search: L-cysteine = 268 reactions were found.
State Icon Reaction EC-Number Conf. maximal confidence score from EnzymeDetector PW
L-glutamate + L-cysteine + ATP <=> gamma-Glu-L-Cys + ADP + phosphate + H+ 6.3.2.2 glutamate---cysteine ligase

L-cystathionine + H2O <=> L-cysteine + 2-oxobutyrate + NH3 2.5.1.48 cystathionine gamma-synthase
4.4.1.1 cystathionine gamma-lyase


H+ + sulfite + L-cysteine <=> Sulfide + L-cysteic_acid 4.4.1.10 cysteine lyase

L-cysteine + cyanide <=> H+ + Sulfide + Beta-cyanoalanine 2.5.1.47 cysteine synthase
2.8.1.1 thiosulfate sulfurtransferase
4.4.1.9 L-3-cyanoalanine synthase



L-cystine + glutathione <=> GSSG + L-cysteine 1.8.1.6 cystine reductase
1.8.4.4 glutathione---cystine transhydrogenase
1.8.4.9 adenylyl-sulfate reductase (glutathione)



H2O + O2 + an_S-prenyl-L-cysteine <=> 3-methylbut-2-enal + H2O2 + L-cysteine 1.8.3.5 prenylcysteine oxidase

O2 + L-cysteine <=> H+ + L-cysteine_sulfinic_acid 1.13.11.20 cysteine dioxygenase
1.14.99.52 L-cysteinyl-L-histidinylsulfoxide synthase


L-2-aminoadipate + L-cysteine + L-valine + ATP + H2O <=> H+ + N-[(5S)-5-amino-5-carboxypentanoyl]-L-cysteinyl-D-valine + AMP + diphosphate 6.3.2.26 N-(5-amino-5-carboxypentanoyl)-L-cysteinyl-D-valine synthase

L-cysteine + NAD+ <=> H+ + L-cystine + NADH 1.8.1.6 cystine reductase

tRNAMet + L-cysteine + ATP <=> L-cysteinyl-[tRNACys] + diphosphate + AMP 6.1.1.15 proline---tRNA ligase
6.1.1.16 cysteine---tRNA ligase


O-acetyl-L-serine + Sulfide <=> L-cysteine + acetate + H+ 2.5.1.47 cysteine synthase
2.5.1.49 O-acetylhomoserine aminocarboxypropyltransferase
2.5.1.65 O-phosphoserine sulfhydrylase
4.2.1.22 cystathionine beta-synthase
4.2.1.50 pyrazolylalanine synthase
4.4.1.9 L-3-cyanoalanine synthase






O-succinyl-L-homoserine + L-cysteine <=> L-cystathionine + succinate + H+ 2.5.1.48 cystathionine gamma-synthase

L-cysteine + 2-oxoglutarate <=> 3-Mercaptopyruvate + L-glutamate 2.6.1.1 aspartate transaminase
2.6.1.3 cysteine transaminase
2.6.1.5 tyrosine transaminase



(R)-4''-phosphopantothenate + L-cysteine + CTP <=> H+ + (R)-4''-phosphopantothenoyl-L-cysteine + diphosphate + CMP 6.3.2.5 phosphopantothenate---cysteine ligase (CTP)

1-O-(2-amino-2-deoxy-alpha-D-glucopyranosyl)-1D-myo-inositol + L-cysteine + ATP <=> H+ + desacetylmycothiol + AMP + diphosphate 6.3.1.13 L-cysteine:1D-myo-inositol 2-amino-2-deoxy-alpha-D-glucopyranoside ligase

O-phospho-L-serine + Sulfide <=> L-cysteine + phosphate 2.5.1.47 cysteine synthase
2.5.1.65 O-phosphoserine sulfhydrylase


S-(2E,6E)-farnesyl-L-cysteine + O2 + H2O <=> (2E,6E)-farnesal + L-cysteine + H2O2 1.8.3.5 prenylcysteine oxidase
1.8.3.6 farnesylcysteine lyase


L-cysteine + H2O <=> pyruvate + Sulfide + NH3 4.4.1.1 cystathionine gamma-lyase
4.4.1.11 methionine gamma-lyase
4.4.1.13 cysteine-S-conjugate beta-lyase
4.4.1.28 L-cysteine desulfidase
4.4.1.3 dimethylpropiothetin dethiomethylase





L-cysteine <=> 2-aminoacrylate + Sulfide 4.4.1.28 L-cysteine desulfidase

L-cystathionine <=> L-cysteine + 2-aminobut-2-enoate + H+ 4.4.1.1 cystathionine gamma-lyase

hercynine + L-cysteine + O2 <=> S-(hercyn-2-yl)-L-cysteine_S-oxide + H2O 1.14.99.51 hercynylcysteine S-oxide synthase

L-histidine + L-cysteine + O2 <=> S-(L-histidin-5-yl)-L-cysteine_S-oxide + H2O 1.14.99.52 L-cysteinyl-L-histidinylsulfoxide synthase

(R)-4''-phosphopantothenate + L-cysteine + ATP <=> H+ + (R)-4''-phosphopantothenoyl-L-cysteine + diphosphate + AMP 6.3.2.51 phosphopantothenate---cysteine ligase (ATP)

L-cystathionine + H2O <=> L-cysteine + L-homoserine 4.4.1.1 cystathionine gamma-lyase

L-cysteine + H2O <=> L-serine + Sulfide 2.5.1.47 cysteine synthase
2.5.1.49 O-acetylhomoserine aminocarboxypropyltransferase
4.2.1.22 cystathionine beta-synthase



L-cysteine + O-phospho-L-homoserine <=> L-cystathionine + phosphate 2.5.1.48 cystathionine gamma-synthase

Cys-Gly + H2O <=> L-cysteine + glycine 3.4.11.1 leucyl aminopeptidase
3.4.11.10 bacterial leucyl aminopeptidase
3.4.11.2 membrane alanyl aminopeptidase
3.4.11.23 PepB aminopeptidase
3.4.11.6 aminopeptidase B
3.4.13
3.4.13.18 cytosol nonspecific dipeptidase
3.4.13.23








ATP + L-cysteine + H2O <=> ADP + L-cysteine + phosphate + H+ 7.4.2
7.4.2.1 ABC-type polar-amino-acid transporter


L-cysteine + L-homocysteine <=> L-cystathionine + Sulfide 2.5.1.47 cysteine synthase
4.2.1.22 cystathionine beta-synthase
4.4.1.1 cystathionine gamma-lyase



L-cysteine <=> Lanthionine + Sulfide 2.5.1.47 cysteine synthase
4.2.1.22 cystathionine beta-synthase
4.4.1.1 cystathionine gamma-lyase



L-cysteine + [enzyme]-cysteine <=> L-alanine + [enzyme]-S-sulfanylcysteine 2.8.1.7 cysteine desulfurase

gamma-Glu-L-Cys <=> 5-oxoproline + L-cysteine 4.3.2.9 gamma-glutamylcyclotransferase

O-acetyl-L-homoserine + L-cysteine <=> L-cystathionine + acetate 2.5.1.48 cystathionine gamma-synthase

L-cysteine + ''activated''_tRNA <=> L-serine + tRNA_containing_a_thionucleotide 2.8.1.4 tRNA uracil 4-sulfurtransferase

H+ + S-Glutathionyl-L-cysteine + NADPH <=> L-cysteine + glutathione + NADP+ 1.8.1.10 CoA-glutathione reductase
1.8.1.9 thioredoxin-disulfide reductase
1.8.4.2 protein-disulfide reductase (glutathione)



dopaquinone + L-cysteine <=> Cysteinyldopa not assigned

(Z)-phenylacetaldoxime + O2 + L-cysteine + NADPH + H+ <=> S-(Phenylacetothiohydroximoyl)-L-cysteine + H2O + NADP+ 1.14

molybdenum_cofactor + L-cysteine + reduced_acceptor <=> MoOS(OH)Dtpp-mP + L-alanine + H2O + acceptor 2.8.1.9 molybdenum cofactor sulfurtransferase

L-cysteine + acceptor <=> L-alanine + sulfhydryl_reagents 2.8.1.7 cysteine desulfurase
4.4.1.16 selenocysteine lyase


N-acetyl-L-cysteine + H2O <=> L-cysteine + acetate 3.5.1.14 N-acyl-aliphatic-L-amino acid amidohydrolase
3.5.1.15 aspartoacylase
3.5.1.16 acetylornithine deacetylase
3.5.1.32 hippurate hydrolase




Lanthionine + H2O <=> L-cysteine + NH3 + pyruvate 4.4.1.13 cysteine-S-conjugate beta-lyase
4.4.1.3 dimethylpropiothetin dethiomethylase


L-cysteine + 2-mercaptoethanol <=> S-(2-Hydroxyethyl)-L-cysteine + Sulfide 4.2.1.22 cystathionine beta-synthase

L-cysteine + H2O + O2 <=> 3-Mercaptopyruvate + NH3 + H2O2 1.4.3.2 L-amino-acid oxidase

beta-chloro-L-alanine + Sulfide <=> L-cysteine + Cl- 2.5.1.47 cysteine synthase
4.4.1.9 L-3-cyanoalanine synthase


L-glutamine + 3-Mercaptopyruvate <=> 2-Oxoglutaramate + L-cysteine 2.6.1.15 glutamine---pyruvate transaminase

L-cystine + NADPH + H+ <=> 2 L-cysteine + NADP+ 1.8.1.9 thioredoxin-disulfide reductase

(E,Z)-indolyl-3-acetaldoxime + L-cysteine + NADPH + O2 + H+ <=> S-(Indolylmethylthiohydroximoyl)-L-cysteine + NADP+ + 2 H2O 1.14.14.43 (methylsulfanyl)alkanaldoxime N-monooxygenase
1.14.14.45 aromatic aldoxime N-monooxygenase


L-cysteine <=> D-cysteine 5.1.1.10 amino-acid racemase

L-cystine + sulfate <=> S-sulfocysteine + L-cysteine 1.8.4.3 glutathione---CoA-glutathione transhydrogenase

L-serine <=> L-cysteine not assigned

O-acetyl-L-serine + thiosulfate + thioredoxin + H+ <=> L-cysteine + sulfite + thioredoxin_disulfide + acetate 2.5.1.47 cysteine synthase
2.5.1.49 O-acetylhomoserine aminocarboxypropyltransferase


1-aci-nitro-2-indolyl-ethane + L-cysteine <=> S-(Indolylmethylthiohydroximoyl)-L-cysteine + H2O not assigned

p-hydroxyphenylacetaldoxime + O2 + NADPH + L-cysteine + H+ <=> S-(Hydroxyphenylacetothiohydroximoyl)-L-cysteine + NADP+ + 2 H2O 1.14

4-methylthiobutanaldoxime + L-cysteine + reduced_flavodoxin + O2 <=> S-(4-Methylthiobutylthiohydroximoyl)-L-cysteine + flavin + 2 H2O 1.14.14.43 (methylsulfanyl)alkanaldoxime N-monooxygenase

an_aliphatic_aldoxime + NADPH + O2 + L-cysteine + H+ <=> S-Alkyl-thiohydroximate + NADP+ + 2 H2O 1.14

S-sulfocysteine + thioredoxin <=> L-cysteine + sulfite + thioredoxin_disulfide not assigned

(E)-phenylacetaldoxime + L-cysteine + NADPH + O2 + H+ <=> S-(Phenylacetothiohydroximoyl)-L-cysteine + NADP+ + 2 H2O 1.14.14.45 aromatic aldoxime N-monooxygenase

p-hydroxyphenylacetaldoxime + L-cysteine + NADPH + O2 + H+ <=> S-(Hydroxyphenylacetothiohydroximoyl)-L-cysteine + NADP+ + 2 H2O 1.14.14.45 aromatic aldoxime N-monooxygenase

(5R)-carbapen-2-em-3-carboxylate + L-cysteine <=> C20817 + CO2 not assigned

[Sulfur-carrier_protein]-Gly-Gly-L-Cys + H2O <=> L-cysteine + Sulfur-carrier_protein 3.13.1.6 [CysO sulfur-carrier protein]-S-L-cysteine hydrolase

L-cysteine + protein <=> L-alanine + a_[protein]-S-sulfanyl-L-cysteine 2.8.1.7 cysteine desulfurase

peptide_with_an_N-terminal_L-cysteine + H2O <=> L-cysteine + peptide 3.4.11.3 cystinyl aminopeptidase

2-sulfoacetaldehyde + L-cysteine <=> H+ + 2-(sulfomethyl)thiazolidine-4-carboxylate + H2O not assigned

(5-hydroxy-1H-indol-3-yl)acetaldehyde + L-cysteine <=> 5-hydroxyindole_thiazolidine_carboxylate + H2O + H+ not assigned

S-adenosyl-L-methionine + (2-hydroxybenzoyl)adenylate + L-cysteine + malonyl-CoA + NADPH + H+ <=> yersiniabactin + CoA + S-adenosyl-L-homocysteine + NADP+ + H2O + AMP 2.3.1

S-adenosyl-L-methionine + salicylate + L-cysteine + NADPH <=> pyochelin + S-adenosyl-L-homocysteine + NADP+ + H2O not assigned

L-cysteine + ATP + H+ <=> (L-cysteinyl)adenylate + diphosphate not assigned

4-(2-aminoethyl)-1,2-benzoquinone + L-cysteine <=> 5-S-cysteinyl_dopamine not assigned

L-cysteine + unsulfurated_[sulfur_carrier] <=> L-alanine + sulfurated_[sulfur_carrier] 2.8.1.7 cysteine desulfurase

L-cysteine + [cysteine_desulfurase]-S-sulfanyl-[disordered-form_scaffold_protein]_complex <=> L-alanine + S-sulfanyl-[cysteine_desulfurase]-S-sulfanyl-[disordered-form_scaffold_protein]_complex 2.8.1.7 cysteine desulfurase

[CysO_sulfur-carrier_protein]-Gly-NH-CH2-C(O)-S-L-cysteine + H2O <=> [CysO_sulfur-carrier_protein]-Gly-Gly + L-cysteine + H+ 3.13.1.6 [CysO sulfur-carrier protein]-S-L-cysteine hydrolase

L-cysteine + H+ <=> L-cysteine + H+ not assigned

L-cysteine + [L-cysteine_desulfurase] <=> L-alanine + S-sulfanyl-[L-cysteine_desulfurase] 2.8.1.7 cysteine desulfurase

L-cysteinyl-[tRNACys] + H2O <=> L-cysteine + tRNAMet + H+ 3.1.1.29 aminoacyl-tRNA hydrolase

HlmE_non-ribosomal_peptide_synthetase + L-cysteine + ATP <=> L-cysteinyl-[HlmE_non-ribosomal_peptide_synthetase] + AMP + diphosphate 6.3.2

(2E)-2-amino-3-sulfanylprop-2-enoyl-[HlmE_non-ribosomal_peptide_synthetase] + L-cysteine + acceptor + ATP <=> (2E)-2-[(2E)-2-azanidyl-3-sulfanylprop-2-enamido]-3-[HlmE_non-ribosomal_peptide_synthetase] + reduced_acceptor + AMP + diphosphate + H+ 6.3.2

S-adenosyl-L-methionine + quinoxaline-2-carboxyl-D-seryl-L-alanyl-[non-ribosomal_peptide_synthase] + L-cysteine + L-valine + ATP <=> triostin_A_dithiol + non-ribosomal_peptide_synthase + AMP + diphosphate + H+ + S-adenosyl-L-homocysteine 6.3.2

3-hydroxyquinaldyl-[aryl-carrier_protein] + L-cysteine + glycine + non-ribosomal_peptide_synthase + ATP <=> 3-hydroxyquinaldyl-D-cysteinyl-glycyl-[non-ribosomal_peptide_synthase] + aryl-carrier_protein + AMP + diphosphate + H+ 6.3.2

S-adenosyl-L-methionine + 3-hydroxyquinaldyl-D-cysteinyl-glycyl-[non-ribosomal_peptide_synthase] + L-cysteine + ATP <=> S-demethyl-thiocoraline_dithiol + non-ribosomal_peptide_synthase + AMP + diphosphate + H+ + S-adenosyl-L-homocysteine 6.3.2

S-sulfocysteine + reduced_glutaredoxin <=> L-cysteine + sulfite + thioredoxin_disulfide + H+ not assigned

2-cyano-6-hydroxybenzothiazole + L-cysteine + acceptor <=> L-luciferin + NH3 + reduced_acceptor not assigned

2-amino-3-[(2,5-dihydroxyphenyl)sulfanyl]propanoate + L-cysteine + acceptor <=> L-luciferin + CO2 + H2O + H+ + reduced_acceptor not assigned

1,4-benzoquinone + L-cysteine <=> 2-amino-3-[(2,5-dihydroxyphenyl)sulfanyl]propanoate not assigned

dopaquinone + L-cysteine <=> 2-S-cysteinyldopa not assigned

L-cysteine + holo-[L-cysteinyl-carrier_protein] + ATP <=> L-cysteinyl-[L-cysteinyl-carrier_protein] + AMP + diphosphate 6.2.1.aa

L-cysteine + [PchE_non-ribosomal_peptide_synthase] + ATP <=> L-cysteinyl-[PchE_non-ribosomal_peptide_synthase] + AMP + diphosphate 6.2.1.aa

L-cysteine + [PchF_non-ribosomal_peptide_synthase_protein] + ATP <=> L-cysteinyl-[PchF_non-ribosomal_peptide_synthase] + AMP + diphosphate 6.2.1.aa

glutathione + S-sulfocysteine <=> GSSG + L-cysteine + sulfite + H+ 1.8.4.2 protein-disulfide reductase (glutathione)

L-cysteine + adenylyl-[ThiS] + reduced_acceptor <=> thiocarboxy-[ThiS-Protein] + L-alanine + AMP + acceptor + H+ 2.8.1.7 cysteine desulfurase

L-cysteinyl-[tRNAPro] + H2O <=> tRNAMet + L-cysteine + H+ 4.2.99

(E)-4-(methylsulfanyl)butanal_oxime + NADPH + O2 + L-cysteine + H+ <=> S-(4-Methylthiobutylthiohydroximoyl)-L-cysteine + NADP+ + H2O not assigned

L-cysteine + [ThiI_sulfur-carrier_protein]-L-cysteine <=> L-alanine + [ThiI_sulfur-carrier_protein]-S-sulfanyl-L-cysteine 2.8.1.7 cysteine desulfurase

L-cysteine <=> L-cysteine not assigned

L-cysteine + [L-cysteine_desulfurase]-L-cysteine <=> L-alanine + [L-cysteine_desulfurase]-S-sulfanyl-L-cysteine not assigned

Indole-3-aldehyde + L-cysteine <=> S-indole-L-cysteine not assigned

(S)-malyl_alpha-D-glucosaminide + L-cysteine <=> bacillithiol + H2O not assigned

H+ + (E)-5-(methylsulfanyl)pentanal_oxime + NADPH + O2 + L-cysteine <=> (E)-1-(L-cystein-S-yl)-N-hydroxy-omega-(methylsulfanyl)pentan-1-imine + NADP+ + H2O not assigned

H+ + 6-Methylthiohexanaldoxime + NADPH + O2 + L-cysteine <=> (E)-1-(L-cystein-S-yl)-N-hydroxy-omega-(methylsulfanyl)hexan-1-imine + NADP+ + H2O not assigned

H+ + 4-methylthioheptanaldoxime + NADPH + O2 + L-cysteine <=> (E)-1-(L-cystein-S-yl)-N-hydroxy-omega-(methylsulfanyl)heptan-1-imine + NADP+ + H2O not assigned

H+ + 4-methylthiooctanaldoxime + NADPH + O2 + L-cysteine <=> (E)-1-(L-cystein-S-yl)-N-hydroxy-omega-(methylsulfanyl)octan-1-imine + NADP+ + H2O not assigned

H+ + 4-methylthiononanaldoxime + NADPH + O2 + L-cysteine <=> (E)-1-(L-cystein-S-yl)-N-hydroxy-omega-(methylsulfanyl)nonan-1-imine + NADP+ + H2O not assigned

indole-3-carbinol + L-cysteine <=> indol-3-ylmethyl-L-cysteine + H2O not assigned

p-hydroxyphenylacetaldoxime + flavin_hydroquinone + L-cysteine + O2 <=> S-(benzohydroximoyl)-L-cysteine + [oxidized_NADPH-hemoprotein_reductase] + 2 H2O 1.14.14.45 aromatic aldoxime N-monooxygenase

2-fluorohistidine + L-cysteine + O2 <=> S-(2-fluoro-L-histidin-5-yl)-L-cysteine_S-oxide + H2O 1.14.99.52 L-cysteinyl-L-histidinylsulfoxide synthase

D-histidine + L-cysteine + O2 <=> S-(D-histidin-5-yl)-L-cysteine_S-oxide + S-(D-histidin-2-yl)-L-cysteine_S-oxide + H2O 1.14.99.52 L-cysteinyl-L-histidinylsulfoxide synthase

histamine + L-cysteine + O2 <=> S-(histamin-5-yl)-L-cysteine_S-oxide + H2O 1.14.99.52 L-cysteinyl-L-histidinylsulfoxide synthase

L-histidinamide + L-cysteine + O2 <=> S-(L-histidinamide-5-yl)-L-cysteine_S-oxide + H2O 1.14.99.52 L-cysteinyl-L-histidinylsulfoxide synthase

D-allocystathionine + H2O <=> L-cysteine + NH3 + 2-oxobutyrate 4.4.1.1 cystathionine gamma-lyase

DL-cystathionine + H2O <=> L-cysteine + NH3 + 2-oxobutyrate 4.4.1.1 cystathionine gamma-lyase

geranylgeranylcysteine + O2 + H2O <=> geranylgeranal + L-cysteine + H2O2 1.8.3.5 prenylcysteine oxidase

L-cysteine + O2 <=> L-cystine + H2O2 1.8.3.2 thiol oxidase
1.8.3.3 glutathione oxidase


N-carbamoyl-L-cysteine + H2O <=> L-cysteine + CO2 + NH3 3.5.1.87 N-carbamoyl-L-amino-acid hydrolase

L-cysteine + 2-oxoglutarate <=> pyruvate + L-glutamate 2.6.1.1 aspartate transaminase

S-adenosyl-L-methionine + L-cysteine <=> S-adenosyl-L-homocysteine + S-methyl-L-cysteine 2.1.1.10 homocysteine S-methyltransferase
2.1.1.280 selenocysteine Se-methyltransferase


GTP + L-glutamate + L-cysteine <=> GDP + phosphate + gamma-Glu-L-Cys 6.3.2.2 glutamate---cysteine ligase

UTP + L-glutamate + L-cysteine <=> UDP + phosphate + gamma-Glu-L-Cys 6.3.2.2 glutamate---cysteine ligase

L-cysteine + 2-oxoglutarate <=> 2-oxo-3-thiobutyrate + L-glutamate 2.6.1.42 branched-chain-amino-acid transaminase

L-cysteine + pyruvate + NADH <=> N2-(D-1-Carboxyethyl)-L-Cys + NAD+ 1.5.1.28 opine dehydrogenase

L-cysteine + H2O + NAD+ <=> 3-Mercaptopyruvate + NH3 + NADH 1.4.1.5 L-amino-acid dehydrogenase
1.4.1.8 valine dehydrogenase (NADP+)


L-cysteine + pyruvate + NADH + H+ <=> N-(1-carboxyethyl)-L-Cys + NAD+ + H2O 1.5.1.22 strombine dehydrogenase

L-cysteine + dithiothreitol <=> Beta-cyanoalanine + Sulfide 2.5.1.47 cysteine synthase

L-cysteine + dithiothreitol <=> S-(2,3-hydroxy-4-thiobutyl)-L-cysteine + Sulfide 2.5.1.47 cysteine synthase
2.5.1.65 O-phosphoserine sulfhydrylase


CTP + (R)-4''-phosphopantothenate + L-cysteine <=> (R)-4''-phosphopantothenoyl-L-cysteine + CDP + phosphate 6.3.2.5 phosphopantothenate---cysteine ligase (CTP)

L-cysteine + pyruvate + NADPH <=> N2-(D-1-Carboxyethyl)-L-Cys + NADP+ + H2O 1.5.1.11 D-octopine dehydrogenase

4beta-(S-cysteinyl)-epicatechin + NADPH + H+ <=> epicatechin + L-cysteine + NADP+ 1.17.1.3 leucoanthocyanidin reductase

L-cysteine + NADPH <=> L-cystine + NADP+ 1.8.1.9 thioredoxin-disulfide reductase

glycyl-L-cysteine + H2O <=> glycine + L-cysteine 3.4.11.19 D-stereospecific aminopeptidase

N-carbobenzoxy-L-cysteine + H2O <=> benzyl_alcohol + CO2 + L-cysteine 3.5.1.64 Nalpha-benzyloxycarbonylleucine hydrolase

L-Cys-7-amido-4-methylcoumarin + H2O <=> L-cysteine + 7-amino-4-methylcoumarin 3.4.11.1 leucyl aminopeptidase
3.4.11.10 bacterial leucyl aminopeptidase
3.4.11.6 aminopeptidase B



3''-phosphoadenylylsulfate + L-cysteine <=> adenosine_3'',5''-bisphosphate + 2-amino-3-sulfosulfanyl-propionic_acid 2.8.2.16 thiol sulfotransferase

L-cysteine + adenosine <=> S-adenosyl-L-homocysteine 3.3.1.1 adenosylhomocysteinase

D-glutamine + L-cysteine <=> D-Glu-L-Cys + NH3 2.3.2.2 gamma-glutamyltransferase

2-oxosuccinamic_acid + L-cysteine <=> L-asparagine + 3-Mercaptopyruvate 2.6.1.14 asparagine---oxo-acid transaminase

ubiquitin-Cys + H2O <=> ubiquitin + L-cysteine 3.4.19.12 ubiquitinyl hydrolase 1

L-cysteine + L-homocystine <=> L-cystine + 2 L-homocysteine 1.8.4.1 glutathione---homocystine transhydrogenase

O-acetyl-L-serine + Thiophenol <=> L-cysteine + Benzyl_acetate 2.5.1.47 cysteine synthase

L-cysteine + L-homocysteine <=> L-cystathionine + acetate 2.5.1.47 cysteine synthase
4.2.1.22 cystathionine beta-synthase


Sulfide + L-cysteine + ubiquinone <=> thiocysteine + ubiquinol 1.8.5.4 bacterial sulfide:quinone reductase

cysteine-glutathione + glutathione <=> L-cysteine + GSSG 1.8.4.3 glutathione---CoA-glutathione transhydrogenase

O-malonyl-L-homoserine + L-cysteine <=> L-cystathionine + malonate 2.5.1.48 cystathionine gamma-synthase

L-kynurenine + 3-Mercaptopyruvate <=> 4-(2-aminophenyl)-2,4-dioxobutanoate + L-cysteine 2.6.1.7 kynurenine---oxoglutarate transaminase

L-cysteine + D-homoserine <=> L-cystathionine 4.4.1.1 cystathionine gamma-lyase

O-Succinyl-L-serine + L-cysteine <=> Lanthionine + succinate 2.5.1.48 cystathionine gamma-synthase

L-cystathionine + L-cysteine <=> L-cystathionine + L-cysteine 2.5.1.48 cystathionine gamma-synthase

L-cysteine + H2O + 2 cytochrome_b <=> 3-Mercaptopyruvate + NH3 + 2 reduced_cytochrome_b 1.4.99.B3

thiamine + L-cysteine <=> 4-methyl-5-(2-hydroxyethyl)-thiazole + 2-[[(4-amino-2-ethylpyrimidin-5-yl)methyl]amino]-3-mercaptopropanoic_acid 2.5.1.2 thiamine pyridinylase

L-cysteine + 1-mercapto-2-propanol <=> HOOC-CH(NH2)-CH2-S-CH2-CH(OH)-CH3 + Sulfide 4.2.1.22 cystathionine beta-synthase

O-phenyl-L-homoserine + L-cysteine <=> L-cystathionine + phenol 2.5.1.48 cystathionine gamma-synthase

L-cysteine + DL-homocysteine <=> L-cystathionine + Sulfide 4.2.1.22 cystathionine beta-synthase

L-cysteine + NaCN <=> Beta-cyanoalanine + Na2S 4.4.1.9 L-3-cyanoalanine synthase

N-lauroyl-L-Cys + H2O <=> laurate + L-cysteine 3.5.1.14 N-acyl-aliphatic-L-amino acid amidohydrolase

[CysO_sulfur-carrier_protein]-Gly-NH-CH2-C(O)-S-L-cysteine + H2O <=> [CysO_sulfur-carrier_protein]-Gly-NH-CH2-COOH + L-cysteine 3.13.1.6 [CysO sulfur-carrier protein]-S-L-cysteine hydrolase

L-cysteine_methyl_ester + H2O <=> L-cysteine + methanol 3.1.1.43 alpha-amino-acid esterase

Ile-tRNAIle + L-cysteine <=> tRNAMet + isoleucylcysteine 6.1.1.5 isoleucine---tRNA ligase

thiocysteine + O2 <=> L-cysteine + sulfite 1.13.11.18 persulfide dioxygenase

L-cysteine + L-serine <=> Lanthionine + H2O 4.2.1.22 cystathionine beta-synthase

L-cystinyl-p-nitroanilide + H2O <=> L-cysteine + 4-nitroaniline 3.4.11.10 bacterial leucyl aminopeptidase
3.4.11.3 cystinyl aminopeptidase


glyoxylate + L-cysteine <=> glycine + 3-Mercaptopyruvate 2.6.1.15 glutamine---pyruvate transaminase
2.6.1.64 glutamine---phenylpyruvate transaminase


L-cysteine + H2O <=> Thiophenol + pyruvate + NH3 4.1.99.2 tyrosine phenol-lyase

L-cysteine <=> Sulfide 4.4.1.1 cystathionine gamma-lyase

L-cysteine + H2O <=> Sulfide + S-(2-Hydroxyethyl)-L-cysteine 4.4.1.11 methionine gamma-lyase

O-phospho-L-serine + Sulfide <=> L-cysteine + H2O 2.5.1.49 O-acetylhomoserine aminocarboxypropyltransferase

L-cysteine <=> pyruvate + Sulfide 2.8.1.7 cysteine desulfurase

L-cysteine + L-cysteine <=> Lanthionine 4.4.1.10 cysteine lyase

L-cysteine + 2-(glutathione-S-yl)-trichloro-p-hydroquinone <=> glutathionyl_cysteinyl_disulfide + 2,3,5-trichlorohydroquinone 1.8.5.7 glutathionyl-hydroquinone reductase

[CysO_sulfur-carrier_protein]-His10-L-Ala-NH-CH2-C(O)-S-L-cysteine + H2O <=> [CysO_sulfur-carrier_protein]-His-10-L-Ala-NH-CH2-COOH + L-cysteine 3.13.1.6 [CysO sulfur-carrier protein]-S-L-cysteine hydrolase

[CysO_sulfur-carrier_protein]-His10-L-Cys-NH-CH2-C(O)-S-L-cysteine + H2O <=> [CysO_sulfur-carrier_protein]-His-10-L-Cys-NH-CH2-COOH + L-cysteine 3.13.1.6 [CysO sulfur-carrier protein]-S-L-cysteine hydrolase

Cys-Leu + H2O <=> L-cysteine + L-leucine 3.4.11.1 leucyl aminopeptidase
3.4.11.23 PepB aminopeptidase


L-Cys-beta-naphthylamide + H2O <=> L-cysteine + 2-Naphthylamine 3.4.11.3 cystinyl aminopeptidase

L-cysteinyl_7-amido-4-carbamoylmethylcoumarin + H2O <=> L-cysteine + 7-amino-4-carbamoylmethylcoumarin 3.4.11.10 bacterial leucyl aminopeptidase

Leu-Cys + H2O <=> L-leucine + L-cysteine 3.4.11.23 PepB aminopeptidase

gamma-Glu-L-Cys + Gly-Gly <=> L-cysteine + 5-L-glutamyl-Gly-Gly 2.3.2.2 gamma-glutamyltransferase

cysteinyl-bis-glycine + H2O <=> L-cysteine + glycine 3.4.11.1 leucyl aminopeptidase

ATP + (R)-4''-phosphopantothenate + L-cysteine <=> (R)-4''-phosphopantothenoyl-L-cysteine + ADP + phosphate 6.3.2.5 phosphopantothenate---cysteine ligase (CTP)

ATP + L-asparagine + L-cysteine <=> ADP + phosphate + L-asparaginyl-L-cysteine 6.3.2.B10

ATP + L-glutamate + L-cysteine <=> ADP + phosphate + L-glutamyl-L-cysteine 6.3.2.2 glutamate---cysteine ligase

ATP + L-cysteine + glycine <=> ADP + phosphate + Cys-Gly 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-methionine + L-cysteine <=> ADP + phosphate + L-methionyl-L-cysteine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + 3-aminopentanedioate + L-cysteine <=> ADP + phosphate + beta-aminoglutaryl-L-Cys 6.3.2.2 glutamate---cysteine ligase

ATP + beta-Methylglutamate + L-cysteine <=> ADP + phosphate + beta-methylglutamyl-L-Cys 6.3.2.2 glutamate---cysteine ligase

ATP + D-glutamate + L-cysteine <=> ADP + phosphate + D-Glu-L-Cys 6.3.2.2 glutamate---cysteine ligase

ATP + L-isoleucine + L-cysteine <=> ADP + phosphate + isoleucylcysteine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + N-Methyl-L-glutamate + L-cysteine <=> ADP + phosphate + N-methyl-L-glutaryl-L-Cys 6.3.2.2 glutamate---cysteine ligase

ATP + UDP-N-acetylmuramate + L-cysteine <=> ADP + phosphate + UDP-N-acetylmuramoyl-L-Cys 6.3.2.8 UDP-N-acetylmuramate---L-alanine ligase

ATP + alpha-Methyl-DL-glutamate + L-cysteine <=> ADP + phosphate + alpha-methylglutamyl-L-Cys 6.3.2.2 glutamate---cysteine ligase

ATP + threo-beta-Hydroxy-DL-glutamate + L-cysteine <=> ADP + phosphate + threo-beta-hydroxy-L-Glu-L-Cys 6.3.2.2 glutamate---cysteine ligase

ATP + 2 L-cysteine <=> ADP + phosphate + Cys-Cys 6.3.2.49 L-alanine---L-anticapsin ligase

L-2-Oxothiazolidine-4-carboxylate + H2O + ATP <=> L-cysteine + ADP + phosphate 3.5.2.9 5-oxoprolinase (ATP-hydrolysing)

ATP + L-leucine + L-cysteine <=> ADP + phosphate + Leu-Cys 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + 2-Aminoadipate + L-cysteine <=> ADP + phosphate + DL-aminoadipyl-L-cysteine 6.3.2.2 glutamate---cysteine ligase

ATP + L-cysteine + L-alanine <=> ADP + phosphate + L-cysteinyl-L-alanine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-cysteine + L-serine <=> ADP + phosphate + L-cysteinyl-L-serine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-cysteine + L-threonine <=> ADP + phosphate + L-cysteinyl-L-threonine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-histidine + L-cysteine <=> ADP + phosphate + L-histidyl-L-cysteine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-phenylalanine + L-cysteine <=> ADP + phosphate + L-phenylalanyl-L-cysteine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-tryptophan + L-cysteine <=> ADP + phosphate + L-tryptophanyl-L-cysteine 6.3.2.49 L-alanine---L-anticapsin ligase

ATP + L-tyrosine + L-cysteine <=> ADP + phosphate + L-tyrosinyl-L-cysteine 6.3.2.49 L-alanine---L-anticapsin ligase

L-cysteine + 4-methylsulfanyl-2-oxobutanoate <=> 3-Mercaptopyruvate + L-methionine 2.6.1.57 aromatic-amino-acid transaminase

2-aminobenzoyl-Phe-Arg-Cys + H2O <=> 2-aminobenzoyl-Phe-Arg + L-cysteine