One to Three Letter Code

Convert single letter amino acid codes to three letter codes

What is One to Three Letter Amino Acid Converter?

This tool converts single letter amino acid codes to their corresponding three letter abbreviations. Essential for protein sequence analysis, structural biology, and molecular biology research where different notation systems are used.

How to Use This Converter

Quick guide to convert amino acid codes:

  1. Paste your protein sequence using single letter codes
  2. Three letter codes appear automatically
  3. Download or copy the converted output

When to Use

This tool is useful when you need to:

  • Convert sequences for publication or presentation
  • Match different database formats and standards
  • Prepare sequences for structural analysis software
  • Standardize protein notation across datasets

Example Input

Sample amino acid sequence (single letter codes):

ARNDCQEGHILKMFPSTWYVBZX

Try with your own sequence or use the Example button.

Example Output

Converted three letter code format:

Ala-Arg-Asn-Asp-Cys-Gln-Glu-Gly-His-Ile-Leu-Lys-Met-Phe-Pro-Ser-Thr-Trp-Tyr-Val-Asx-Glx-Xaa

Results can be copied or downloaded as text file.

FAQ

Q: Does this tool handle FASTA format?
A: Yes, both single and multiple protein sequences in FASTA format.

Q: What about ambiguous amino acids?
A: Handles B (Asx), Z (Glx), and X (Xaa) for unknown amino acids.

Q: Can I convert long protein sequences?
A: Yes, no length limitations for protein sequence conversion.