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Table of the 20 amino acids specified by the genetic code.

 

The names and 3-letter and 1-letter abbreviations are presented. For each amino acid, the chemical structure of its R group (or "side chain) and its codons are also presented.

Amino acid

3 letters

1 letter

Structure of the side (R)

Codons
Aspartic acid

 Asp

D

GAU GAC
Alanine

Ala

A

GCU GCC
GCA GCG
Arginine

Arg

R

CGU CGC
CGA CGG
AGA AGG
Asparagine

Asn

N

 

AAU AAC
Cysteine

Cys

C

 

UGU UGC
Glutamic Acid

Glu

E

GAA GAG
Glutamine

Gln

Q

CAA CAG
Glycine

Gly

G

 

GGU GGC
GGA GGG
Histidine

His

H

 

CAU CAC
Isoleucine

Ile

I

AUU AUC
AUA
Leucine

Leu

L

 

CUU CUC
CUA CUG
Lysine

Lys

K

 

AAA AAG
Methionine

Met

M

 

ATG
Phenyl-
alanine

Phe

F

 

UUU UUC
Proline

Pro

P

For proline, the side chain is cyclic and bonded to the nitrogen.

CCU CCC
CCA CCG
Serine

Ser

S

UCU UCC
UCA UCG
AGU AGC
Threonine

Thr

T

ACU ACC
ACA ACG
Trypto-
phan

Trp

W

UGG
Tyrosine

Tyr

Y

 

UAU UAC
Valine

Val

V

GUU GUC
GUA GUG

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