List of amino acids and their abbreviations

    This table is included for future reference.

    Amino acid 3-letter abbreviation 1-letter abbreviation
    Alanine Ala A
    Arginine Arg R
    Asparagine Asn N
    Aspartic acid Asp D
    Cysteine Cys C
    Glutamic acid Glu E
    Glutamine Gln Q
    Glycine Gly G
    Histidine His H
    Isoleucine Ile I
    Leucine Leu L
    Lysine Lys K
    Methionine Met M
    Phenylalanine Phe F
    Proline Pro P
    Serine Ser S
    Threonine Thr T
    Tryptophan Trp W
    Tyrosine Tyr Y
    Valine Val V

    20
    Amino acids, their single-letter data-base codes (SLC), and their corresponding DNA codons

     

    Amino Acid

    SLC

    DNA codons

    Isoleucine

    I

    ATT,
    ATC, ATA

    Leucine  

    L

    CTT, CTC, CTA, CTG, TTA, TTG
    Valine

    V

    GTT, GTC, GTA, GTG
    Phenylalanine  

    F

    TTT, TTC
    Methionine M ATG
    Cysteine  C

    TGT, TGC

    Alanine      

    A

    GCT, GCC,
    GCA, GCG

    Glycine  

    G

    GGT, GGC, GGA, GGG
    Proline      

    P

    CCT, CCC, CCA, CCG
    Threonine  

    T

    ACT, ACC, ACA, ACG
    Serine        S TCT, TCC, TCA, TCG, AGT, AGC

    Tyrosine  

    Y TAT, TAC
    Tryptophan   W TGG
    Glutamine   Q CAA, CAG
    Asparagine   N AAT, AAC
    Histidine 

    H

    CAT, CAC
    Glutamic acid  

    E

    GAA, GAG

    Aspartic acid 

    D

    GAT, GAC
    Lysine       

    K

    AAA, AAG
    Arginine  

    R

    CGT, CGC, CGA, CGG, AGA, AGG
    Stop codons Stop TAA, TAG, TGA
    In this table, the twenty amino acids found in proteins are listed, along
    with the single-letter code used to represent these amino acids in protein data bases. The
    DNA codons representing each amino acid are also listed. All 64 possible 3-letter
    combinations of the DNA coding units T, C, A and G are used either to encode one of these
    amino acids or as one of the three stop codons that signals the end of a sequence. While
    DNA can be decoded unambiguously, it is not possible to predict a DNA sequence from its
    protein sequence. Because most amino acids have multiple codons, a number of possible DNA
    sequences might represent the same protein sequence.

     

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