Lysine (abbreviated as Lys or K)[1], encoded by the codons AAA and AAG) is an ɑ-amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated -+NH3 form under biological conditions), an α-carboxylic acid group (which is in the deprotonated –COO- form under biological conditions), and a side chain lysyl ((CH2)4NH2), classifying it as a charged(at physiological pH), aliphatic amino acid. It is essential in humans, meaning the body cannot synthesize it and thus it must be obtained from the diet.
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IUPAC name
Lysine
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Other names
2,6-Diaminohexanoic acid; 2,6-Diammoniohexanoic acid
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CAS Number
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70-54-2 DL 56-87-1 L 923-27-3 D |
ChEBI | CHEBI:25094 |
ChEMBL | ChEMBL28328 |
ChemSpider | 843 5747 L |
IUPHAR/BPS
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724 |
Jmol interactive 3D | Image |
KEGG | C16440 |
PubChem | 866 |
UNII | K3Z4F929H6 |
InChI[show]
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SMILES[show]
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Chemical formula
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C6H14N2O2 |
Molar mass | 146.19 g·mol−1 |
Solubility in water
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1.5kg/L @ 25 °C |
ATC code | B05XB03 |
Structure and
properties |
Refractive index (n), Dielectric constant (εr), etc. |
Thermodynamic
data |
Phase behaviour solid–liquid–gas |
Spectral data
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UV, IR, NMR, MS |