Codon table

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Revision as of 15:45, 15 December 2010 by Kelvin Liu (talk | contribs) (Changed "T" to "U" because RNA uses Uracil, not Thymine.)
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Codon tables describe how the triplet codon of RNA (or DNA) is read by specific tRNAs to map to a particular amino acid. Many organisms use the Standard Codon Table, shown below.

Comprehensive information about codon usage in different organisms can be found at the NCBI Taxonomy site

Standard Codon table


UUU Phe F Phenylalanine
UUC Phe F Phenylalanine
UUA Leu L Leucine
UUG Leu L Leucine

UCU Ser S Serine
UCC Ser S Serine
UCA Ser S Serine
UCG Ser S Serine

UAU Tyr Y Tyrosine
UAC Tyr Y Tyrosine
UAA Ochre (Stop)
UAG Amber (Stop)

UGU Cys C Cysteine
UGC Cys C Cysteine
UGA Opal (Stop)
UGG Trp W Tryptophan


CUU Leu L Leucine
CUC Leu L Leucine
CUA Leu L Leucine
CUG Leu L Leucine

CCU Pro P Proline
CCC Pro P Proline
CCA Pro P Proline
CCG Pro P Proline

CAU His H Histidine
CAC His H Histidine
CAA Gln Q Glutamine
CAG Gln Q Glutamine

CGU Arg R Arginine
CGC Arg R Arginine
CGA Arg R Arginine
CGG Arg R Arginine


ATT Ile I Isoleucine
ATC Ile I Isoleucine
ATA Ile I Isoleucine
ATG Met M Methionine, Start

ACT Thr T Threonine
ACC Thr T Threonine
ACA Thr T Threonine
ACG Thr T Threonine

AAT Asn N Asparagine
AAC Asn N Asparagine
AAA Lys K Lysine
AAG Lys K Lysine

AGT Ser S Serine
AGC Ser S Serine
AGA Arg R Arginine
AGG Arg R Arginine


GTT Val V Valine
GTC Val V Valine
GTA Val V Valine
GTG Val V Valine

GCT Ala A Alanine
GCC Ala A Alanine
GCA Ala A Alanine
GCG Ala A Alanine

GAT Asp D Aspartic acid
GAC Asp D Aspartic acid
GAA Glu E Glutamic acid
GAG Glu E Glutamic acid

GGT Gly G Glycine
GGC Gly G Glycine
GGA Gly G Glycine
GGG Gly G Glycine

1The codon ATG both codes for methionine and serves as an initiation site: the first ATG in an mRNA's coding region is where translation into protein begins.
2UGA can also code for selenomethionine: the twenty-first amino acid, discovered in 1986.
3UAG can also code for pyrrolysine: the twenty-second amino acid, discovered in 2002.