Three to One Letter Code

Convert three-letter amino acid codes to single-letter codes for protein sequence analysis

What is Three to One Letter Converter?

This tool converts three-letter amino acid codes (like Ala, Gly, Val) to their single-letter equivalents (A, G, V). It automatically removes spaces, digits, and handles special amino acids like Asx, Glx, and Xaa.

How to Use This Converter

Quick guide to convert your sequences:

  1. Paste three-letter amino acid codes
  2. Codes can be separated by spaces, hyphens, or nothing
  3. Results appear automatically in single-letter format

When to Use

This tool is useful when you need to:

  • Convert protein sequences for alignment tools
  • Standardize sequences for database searches
  • Prepare sequences for structural analysis software

Example Input

Sample three-letter sequence:

AlaGlyValLeuIleProPhe

Or with separators: Ala-Gly-Val-Leu-Ile-Pro-Phe

Example Output

Single-letter sequence:

AGVLIPF

Standard single-letter format for analysis.

FAQ

Q: Does it handle special amino acids?
A: Yes, including Asx (B), Glx (Z), Xaa (X), and stop codons (*).

Q: What about non-standard amino acids?
A: Unknown three-letter codes are ignored in the output.