---
title: "Isoleucine: research glossary | Sable Peptides"
description: "Isoleucine (three-letter code Ile, one-letter code I) is a branched-chain amino acid with two chiral centres and a hydrophobic sec-butyl side chain. It has"
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publisher: Sable Peptides Limited (UK company 17488610)
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---

Glossary

# Isoleucine

Isoleucine (three-letter code Ile, one-letter code I) is a branched-chain amino acid with two chiral centres and a hydrophobic sec-butyl side chain. It has the same mass as leucine, so distinguishing them requires specialised fragmentation methods or chromatography. It is beta-branched and favours beta-sheet conformations.

Source: [en.wikipedia.org](https://en.wikipedia.org/wiki/Isoleucine)

## Related terms

-   [Amino acid](/glossary/amino-acid)
-   [One-letter code](/glossary/one-letter-code)
-   [Leucine](/glossary/leucine)

[Back to glossary A–Z](/glossary/terms)

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