L-citrulline   Click here for help

GtoPdb Ligand ID: 722

PDB Ligand
Compound class: Metabolite
Comment: L-citrulline is a non-essential amino acid. Some mammalian proteins naturally contain citrulline residues (myelin basic protein, some histone proteins and filaggrin).
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Ligand Activity Visualisation Charts

These are box plot that provide a unique visualisation, summarising all the activity data for a ligand taken from ChEMBL and GtoPdb across multiple targets and species. Click on a plot to see the median, interquartile range, low and high data points. A value of zero indicates that no data are available. A separate chart is created for each target, and where possible the algorithm tries to merge ChEMBL and GtoPdb targets by matching them on name and UniProt accession, for each available species. However, please note that inconsistency in naming of targets may lead to data for the same target being reported across multiple charts.

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View interactive charts of activity data across species

L-citrulline 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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Click here for structure editor
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 6
Hydrogen bond donors 4
Rotatable bonds 6
Topological polar surface area 118.44
Molecular weight 175.1
XLogP -3.91
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(=O)NCCCC(C(=O)O)N
Isomeric SMILES NC(=O)NCCC[C@@H](C(=O)O)N
InChI InChI=1S/C6H13N3O3/c7-4(5(10)11)2-1-3-9-6(8)12/h4H,1-3,7H2,(H,10,11)(H3,8,9,12)/t4-/m0/s1
InChI Key RHGKLRLOHDJJDR-BYPYZUCNSA-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/)
Natural/Endogenous Targets
Target
GPRC6 receptor
Enzymes Catalysing Reactions with this Compound as a Substrate or Product
Enzyme EC number Reaction Reference
Endothelial NOS
Inducible NOS
Neuronal NOS
Transporters Moving this Compound Across a Lipid Membrane
Transporter EC number Reaction Reference
Mitochondrial ornithine transporter 2 1
Mitochondrial ornithine transporter 1 1
Selectivity at GPCRs
Key to terms and symbols Click column headers to sort
Target Sp. Type Action Value Parameter Concentration range (M) Reference
GPRC6 receptor Ligand is endogenous in the given species Hs Agonist Full agonist 3.6 pEC50 - 2
⤷ pEC50 3.6 [2]
Ligand mentioned in the following text fields
Dimethylarginine dimethylaminohydrolases overview
L-Arginine turnover overview
Mitochondrial amino acid transporter subfamily overview
Nitric oxide synthases overview