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Updated: Sep 7, 2025

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
Published on: August 16, 2017
Hiding in plain sight: three chemically distinct α-helix types
1Laboratory of Molecular Architecture, Media Lab, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.
Linus Pauling
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biology
Background:
- Linus Pauling proposed the alpha-helix, a key protein secondary structure, in 1950.
- The term 'alpha-helix' replaced 'alpha-spiral' following a suggestion by Jack Dunitz.
- Amino acid properties influence alpha-helix structure, a concept familiar to experts but not laypersons.
Purpose of the Study:
- To classify the three chemically distinct types of alpha-helices.
- To make the varying polar and apolar characters of amino acids in alpha-helices accessible to non-experts.
Main Methods:
- Analysis of amino acid sequences and their physicochemical properties within alpha-helical structures.
- Classification of alpha-helices based on distinct chemical characteristics.
Main Results:
- Identification and categorization of three unique types of alpha-helices.
- Demonstration of how amino acid composition dictates alpha-helix chemical properties.
Conclusions:
- The three chemically distinct alpha-helix types can be identified and understood.
- This classification aids in comprehending protein structure beyond expert knowledge.
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