IUPAC codes for amino acids

(Single-letter codes based on International Union of Pure and Applied Chemistry)

The information is gathered from: http://www.ebi.ac.uk/2can/tutorials/aa.html

One-letter abbreviation Three-letter abbreviation Description
A Ala Alanine
R Arg Arginine
N Asn Asparagine
D Asp Aspartic acid
C Cys Cysteine
Q Gln Glutamine
E Glu Glutamic acid
G Gly Glycine
H His Histidine
J Xle Leucine or Isoleucineucine
L Leu Leucine
I ILe Isoleucine
K Lys Lysine
M Met Methionine
F Phe Phenylalanine
P Pro Proline
O Pyl Pyrrolysine
U Sec Selenocysteine
S Ser Serine
T Thr Threonine
W Trp Tryptophan
Y Tyr Tyrosine
V Val Valine
B Asx Aspartic acid or Asparagine Asparagine
Z Glx Glutamic acid or Glutamine Glutamine
X Xaa Any amino acid