L-cysteine   Click here for help

GtoPdb Ligand ID: 4782

Abbreviated name: L-Cys
PDB Ligand
Compound class: Metabolite

L-cysteine is commercially available from our sponsors

2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/). All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 3
Hydrogen bond donors 2
Rotatable bonds 2
Topological polar surface area 102.12
Molecular weight 121.02
XLogP -2.58
No. Lipinski's rules broken 0

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)

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Canonical SMILES NC(C(=O)O)CS
Isomeric SMILES N[C@H](C(=O)O)CS
InChI InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1
InChI Key XUJNEKJLAYXESH-REOHCLBHSA-N

Generated using the Chemistry Development Kit (CDK) (Willighagen EL et al. Journal of Cheminformatics vol. 9:33. 2017, doi:10.1186/s13321-017-0220-4; https://cdk.github.io/)
Enzymes Catalysing Reactions with this Compound as a Substrate or Product
Enzyme EC number Reaction Reference
Cystathionine β-synthase 2
Cystathionine γ-lyase
L-Cysteine:2-oxoglutarate aminotransferase
Transporters Moving this Compound Across a Lipid Membrane
Transporter EC number Reaction Reference
Excitatory amino acid transporter 3 4
Alanine/serine/cysteine transporter 1
Alanine/serine/cysteine transporter 2
NTT4 3
sodium-coupled neutral amino acid transporter 1 1
Additional information and targets (data relate to human unless otherwise stated)
Description Data Reference
Endogenous substrates at Alanine/serine/cysteine transporter 1 L-cysteine > L-alanine = L-serine > L-threonine
Endogenous substrates at Alanine/serine/cysteine transporter 2 L-alanine = L-serine = L-cysteine (low Vmax) = L-threonine = L-glutamine = L-asparagine >> L-methionine ≅ glycine ≅ L-leucine > L-valine > L-glutamic acid (enhanced at low pH)
Endogenous substrates at NTT4 L-leucine, L-methionine, L-proline > L-cysteine, L-alanine, L-glutamine, L-serine > L-histidine, glycine 3
Substrates at sodium-coupled neutral amino acid transporter 1 L-alanine > L-serine, L-glutamine, L-asparagine, L-histidine, L-cysteine, L-methionine > glycine, L-threonine, L-proline, L-tyrosine, L-valine 1