L-histidine
362,296 routes · scope human · up to 3 steps · built 5 October 2026 · Reactions · API
311 compounds within 3 steps: 7 in 1, 67 in 2, 237 in 3
Three steps
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of ornithine and tryptophan (cytosol to extracellular)
- L-tryptophan + O2 + H2O = indole-3-pyruvate + H2O2 + NH4(+)
Catalysed by SLC25A2, SLC7A6, IL4I1inner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of alanine and ornithine (cytosol to extracellular)
- L-Alanine:tRNA(Ala) ligase (AMP-forming)
Catalysed by SLC25A2, SLC7A6, AARS1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- transport of arginine and chloride (cytosol to extracellular)
- transport of betaine and chloride (cytosol to extracellular)
Catalysed by SLC7A6, SLC6A14, SLC6A12inner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 3 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-ornithine carboxy-lyase (putrescine-forming)
- Putrescine:oxygen oxidoreductase (deaminating)
Catalysed by SLC25A2, ODC1, AOC2, AOC1 and 1 moreinner side of the membrane, outer side of the membrane, cytosol, extracellular spaceOne of 2 routes
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- L-Arginine amidinohydrolase
- Peroxidase
Catalysed by SLC7A6, ARG1, MPOinner side of the membrane, outer side of the membrane, cytosol, nucleusOne of 3 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of ornithine and tryptophan (cytosol to extracellular)
- (6R)-L-erythro-5,6,7,8-tetrahydrobiopterin + L-tryptophan + O2 = 5-hydroxy-L-tryptophan + (4aS,6R)-4a-hydroxy-L-erythro-5,6,7,8-tetrahydrobiopterin
Catalysed by SLC25A2, SLC7A6, TPH1, TPH2inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of leucine and ornithine (cytosol to extracellular)
- L-Leucine:2-oxoglutarate aminotransferase
Catalysed by SLC25A2, SLC7A6, BCAT2inner side of the membrane, outer side of the membrane, extracellular space, cytosol, mitochondrial matrixOne of 4 routes
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- 2-(Nomega-L-arginino)succinate arginine-lyase (fumarate-forming)
- 2-(Nomega-L-arginino)succinate arginine-lyase (fumarate-forming)
Catalysed by SLC7A6, ASLinner side of the membrane, outer side of the membrane, cytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of alanine and ornithine (cytosol to extracellular)
- Transport of Hydroxy-Proline
Catalysed by SLC25A2, SLC7A6, SLC1A4inner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 5 routes
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- transport of arginine and chloride (cytosol to extracellular)
- Transport of 3-Ureidopropionate
Catalysed by SLC7A6, SLC6A14inner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- 5-Phospho-D-ribosylamine:glycine ligase (ADP-forming)
Catalysed by SLC25A2, GATM, GARTinner side of the membrane, outer side of the membrane, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of glutamine and ornithine (cytosol to extracellular)
- 5'-Phosphoribosylformylglycinamide:L-glutamine amido-ligase (ADP-forming)
Catalysed by SLC25A2, SLC7A6, PFASinner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- gamma-L-glutamyl-(2S)-2-aminobutanoate + glycine + ATP = ophthalmate + ADP + phosphate + H(+)
Catalysed by SLC25A2, GATM, GSSinner side of the membrane, outer side of the membrane, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of alanine and ornithine (cytosol to extracellular)
- 2-aminoisobutanoate(out) + L-alanine(in) = 2-aminoisobutanoate(in) + L-alanine(out)
Catalysed by SLC25A2, SLC7A6, SLC7A10inner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-ornithine(out) + L-lysine(in) = L-ornithine(in) + L-lysine(out)
- biocytin + H2O = biotin + L-lysine
Catalysed by SLC25A2, SLC25A15, BTDinner side of the membrane, outer side of the membrane
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- N(omega),N(omega)-dimethyl-L-arginine(in) + L-ornithine(out) = N(omega),N(omega)-dimethyl-L-arginine(out) + L-ornithine(in)
- N(omega),N(omega)-dimethyl-L-arginine + pyruvate = 5-(3,3-dimethylguanidino)-2-oxopentanoate + L-alanine
Catalysed by SLC25A2, AGXT2inner side of the membrane, outer side of the membraneOne of 6 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- N(omega),N('omega)-dimethyl-L-arginine + glyoxylate = 5-(3,3'-dimethylguanidino)-2-oxopentanoate + glycine
Catalysed by SLC25A2, GATM, AGXT2inner side of the membrane, outer side of the membrane, cytosolOne of 2 routes
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- N(omega)-methyl-L-arginine(in) + L-arginine(out) = N(omega)-methyl-L-arginine(out) + L-arginine(in)
- N(omega)-methyl-L-arginine + pyruvate = 5-(3-methylguanidino)-2-oxopentanoate + L-alanine
Catalysed by SLC7A6, SLC25A29, AGXT2inner side of the membrane, outer side of the membraneOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- 5,10-Methylenetetrahydrofolate:glycine hydroxymethyltransferase
Catalysed by SLC25A2, GATM, SHMT1inner side of the membrane, outer side of the membrane, cytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of cysteine and ornithine (cytosol to extracellular)
- S-sulfanyl-L-cysteine + L-cysteine = S-disulfanyl-L-cysteine + L-alanine
Catalysed by SLC25A2, SLC7A6, CARS2inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- glycine N-acyltransferase (2-methylbutyryl-CoA)
Catalysed by SLC25A2, GATM, GLYAT, GLYATL2 and 1 moreinner side of the membrane, outer side of the membrane, cytosol, mitochondrial matrixOne of 3 routes
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- transport of arginine and chloride (cytosol to extracellular)
- Peroxidase
Catalysed by SLC7A6, SLC6A14, LPOinner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 4 routes
- 4-aminobutanoate + L-histidine + ATP = L-homocarnosine + ADP + phosphate + H(+)
- Transport of Homocarnosine
- transport of Ca2+ and K+ (cytosol to extracellular)
Catalysed by CARNS1, SLC24A1, SLC24A5, SLC24A4 and 2 moreextracellular space, cytosolOne of 4 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- phenylacetyl-CoA:glycine N-phenylacetyltransferase
Catalysed by SLC25A2, GATM, GLYATinner side of the membrane, outer side of the membrane, cytosolOne of 3 routes
- L-histidine + H(+) = histamine + CO2
- S-Adenosyl-L-methionine:histamine N-tele-methyltransferase
- N-methylhistamine:oxygen oxidoreductase (deaminating)
Catalysed by HDC, HNMT, AOC2, AOC1 and 3 morecytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of ornithine and tryptophan (cytosol to extracellular)
- L-Tryptophan, Tetrahydrobiopterin:Oxygen Oxidoreductase (5-Hydroxylating)
Catalysed by SLC25A2, SLC7A6, TPH1, TPH2inner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 2 routes
- L-histidine + H(+) = histamine + CO2
- transport of GSH and histamine (cytosol to extracellular)
- Glutathione: 5-HPETE oxidoreductase
Catalysed by HDC, SLCO1A2, SLCO1B3, GPX5 and 8 moreextracellular space, cytosolOne of 2 routes
- L-histidine(in) + L-phenylalanine(out) = L-histidine(out) + L-phenylalanine(in)
- Phenylalanine Transaminase, Mitochondrial
- Phenylpyruvate:oxygen oxidoreductase (hydroxylating,decarboxylating)
Catalysed by SLC7A8, GOT2, TAT, HPDinner side of the membrane, outer side of the membrane, mitochondrial matrix, cytosol
- L-histidine + H(+) = histamine + CO2
- transport of histamine (cytosol to extracellular)
- transport of LTD4 (cytosol to extracellular)
Catalysed by HDC, SLCO1A2, SLCO1B3, SLCO1B1extracellular space, cytosolOne of 5 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of alanine and ornithine (cytosol to extracellular)
- L-selenocysteine selenide-lyase (L-alanine-forming)
Catalysed by SLC25A2, SLC7A6, SCLYinner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- L-cystine(out) + L-arginine(in) = L-cystine(in) + L-arginine(out)
- L-cystine thiocysteine-lyase (deaminating
Catalysed by SLC7A6, SLC7A9, CTHinner side of the membrane, outer side of the membrane, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of cysteine and ornithine (cytosol to extracellular)
- N-acetylglutamate synthase (N-acetyl-L-cysteine)
Catalysed by SLC25A2, SLC7A6, NAGSinner side of the membrane, outer side of the membrane, extracellular space, cytosol, mitochondrial matrix
- 4-aminobutanoate + L-histidine + ATP = L-homocarnosine + ADP + phosphate + H(+)
- Transport of Homocarnosine
- Mn(2+)(out) + Ca(2+)(in) = Mn(2+)(in) + Ca(2+)(out)
Catalysed by CARNS1, SLC30A10extracellular space, cytosol, inner side of the membrane, outer side of the membraneOne of 2 routes
- 4-aminobutanoate + L-histidine + ATP = L-homocarnosine + ADP + phosphate + H(+)
- Transport of Homocarnosine
- Ca(2+)(out) + K(+)(out) + 4 Na(+)(in) = Ca(2+)(in) + K(+)(in) + 4 Na(+)(out)
Catalysed by CARNS1, SLC24A1, SLC24A5, SLC24A4 and 2 moreextracellular space, cytosol, inner side of the membrane, outer side of the membraneOne of 6 routes
- 4-aminobutanoate + L-histidine + ATP = L-homocarnosine + ADP + phosphate + H(+)
- Transport of Homocarnosine
- Zn(2+)(in) + Ca(2+)(out) = Zn(2+)(out) + Ca(2+)(in)
Catalysed by CARNS1, SLC30A1extracellular space, cytosol, inner side of the membrane, outer side of the membraneOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of cysteine and ornithine (cytosol to extracellular)
- L-Cysteine:tRNA(Cys) ligase (AMP-forming)
Catalysed by SLC25A2, SLC7A6, CARS1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- L-Arginine:glycine amidinotransferase
- glycine:tRNA(Gly) ligase (AMP-forming)
Catalysed by SLC25A2, GATM, GARS1inner side of the membrane, outer side of the membrane, cytosol
- L-histidine(in) + L-phenylalanine(out) = L-histidine(out) + L-phenylalanine(in)
- L-aspartate(in) + L-phenylalanine(out) = L-aspartate(out) + L-phenylalanine(in)
- L-Aspartate:tRNA(Asp) ligase (AMP-forming)
Catalysed by SLC7A8, SLC7A13, DARS1inner side of the membrane, outer side of the membrane, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of ornithine and tryptophan (cytosol to extracellular)
- L-Tryptophan -tRNA(Trp) ligase (AMP-forming)
Catalysed by SLC25A2, SLC7A6, WARS1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of isoleucine and ornithine (cytosol to extracellular)
- L-Isoleucine:tRNA(Ile) ligase (AMP-forming)
Catalysed by SLC25A2, SLC7A6, IARS1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of glutamine and ornithine (cytosol to extracellular)
- L-Glutamine:tRNA(Gln) ligase (AMP-forming)
Catalysed by SLC25A2, SLC7A6, QARS1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- Amino Acid-Polyamine-Organocation (Apc) Tcdb:2.A.3.8.15
- L-citrulline + H(+) = isocyanate + L-ornithine
Catalysed by SLC25A2, SLC7A9, LACC1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of asparagine and ornithine (cytosol to extracellular)
- L-Asparagine:tRNA(Asn) ligase (AMP-forming)
Catalysed by SLC25A2, SLC7A6, NARS1inner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine + H(+) = histamine + CO2
- transport of histamine (cytosol to extracellular)
- solute carrier organic anion transporter (glycocholate)
Catalysed by HDC, SLCO1A2, SLCO1B3extracellular space, cytosolOne of 7 routes
- L-histidine + H(+) = histamine + CO2
- transport of histamine (cytosol to extracellular)
- solute carrier organic anion transporter (cholate)
Catalysed by HDC, SLCO1A2, SLCO1B3extracellular space, cytosolOne of 4 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of cysteine and ornithine (cytosol to extracellular)
- L-cysteine hydrogen-sulfide-lyase (deaminating
Catalysed by SLC25A2, SLC7A6, CTHinner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 2 routes
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- N2-Acetyl-L-ornithine amidohydrolase
- N2-Acetyl-L-ornithine amidohydrolase
Catalysed by SLC25A2, ACY1inner side of the membrane, outer side of the membrane, cytosol
- L-histidine(in) + L-ornithine(out) + H(+)(in) = L-histidine(out) + L-ornithine(in) + H(+)(out)
- transport of ornithine and tryptophan (cytosol to extracellular)
- L-tryptophan:oxygen 2,3-oxidoreductase (decyclizing)
Catalysed by SLC25A2, SLC7A6, IDO1, TDO2 and 1 moreinner side of the membrane, outer side of the membrane, extracellular space, cytosol
- L-histidine(out) + L-arginine(in) + Na(+)(out) = L-histidine(in) + L-arginine(out) + Na(+)(in)
- Transport by Y+Lat-2 into Extracellular Space
- N1-acetylspermidine:oxygen oxidoreductase (3-acetamidopropanal-forming)
Catalysed by SLC7A6, SLC3A2, PAOX, SMOXinner side of the membrane, outer side of the membrane, extracellular space, cytosolOne of 2 routes