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Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism. Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members. If these new proteins contain similar amino acids in key...

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Related Experiment Video

Updated: Jan 22, 2026

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins

Published on: August 9, 2019

Exploring the sequence patterns in the alpha-helices of proteins.

Junwen Wang¹, Jin-An Feng

¹Department of Chemistry and Center for Biotechnology, Temple University, 1901 North 13th Street, Philadelphia, PA 19122, USA.

Protein Engineering

|November 25, 2003

Summary

This study analyzed protein alpha-helices, finding specific amino acids like tryptophan prefer short helical structures. Neighbor-dependent analysis revealed unique sequence patterns that influence helix formation, aiding in predicting protein secondary structures.

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Area of Science:

Protein structure analysis
Bioinformatics
Structural biology

Background:

Alpha-helices are crucial secondary structures in proteins.
Understanding amino acid propensities for helical formation is key to predicting protein structure.
Previous studies have explored individual amino acid propensities, but neighbor interactions are less understood.

Purpose of the Study:

To conduct an extensive sequence analysis of protein alpha-helices.
To investigate how amino acid propensities for helical conformation vary with helix length.
To identify sequence patterns and amino acid pair preferences that favor alpha-helix formation.

Main Methods:

Extraction of alpha-helices from the Protein Data Bank (PDB).
Classification of helices by size (short, medium, long).
Neighbor-dependent sequence analysis to calculate the effect of adjacent amino acids on helical propensity.

Main Results:

Amino acid propensities for helical conformation differ significantly between short, medium, and long alpha-helices.
Proline and Tryptophan show a higher propensity for short helices; Tryptophan is the strongest helix conformer in short helices.
Amino acid pair preferences for alpha-helix formation exhibit unique patterns not solely predictable from individual propensities.

Conclusions:

The study provides a detailed understanding of amino acid preferences within alpha-helices of varying lengths.
Neighboring amino acid interactions play a critical role in determining alpha-helix formation.
The findings can contribute to developing predictive models for protein secondary structures.