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AbMole Amino acid single-letter ↔ three-letter converter & Nomenclature guide

Amino acid single-letter ↔ three-letter converter

Enter a peptide sequence and the system will automatically detect whether it is single-letter (e.g. MKTA) or three-letter (e.g. Met-Lys-Thr-Ala), then convert it to the other form. Unrecognized or uncommon residues are shown as X.

Conversion result will appear here…
Separator:

Residue-by-residue breakdown

#1-Letter3-LetterNameStatus
Auto-parsed after entering a sequence…

Amino acid symbols & structures

Common amino acids (also called "proteinogenic" or "coded" amino acids) are represented by a three-letter symbol, and sometimes by a single-letter symbol. Uncommon amino acids are also represented by a three-letter symbol, sometimes by the single letter "X". The tables below list the symbols and abbreviations used on our website and in the literature.

Acidic Alkaline Nonpolar (hydrophobic) Polar (uncharged)
Table 1 · Common amino acids
Table 2 · Uncommon amino acids
Table 3 · Substituents

Table 1. Common amino acids

Standard proteinogenic amino acids (20). Color indicates side-chain property.

Amino acid3-Letter1-LetterStructure

Table 2. Uncommon amino acids

Uncommon amino acids and their three-letter codes (single-letter is usually X).

3-LetterAmino acid

Table 3. Substituents

Common protecting groups and modifying-group abbreviations.

Abbrev.Substituent


 
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