Protein Structure Hierarchy

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About This MicroSim

This MicroSim presents the four levels of protein structure (primary, secondary, tertiary, quaternary) with toggle buttons that let students focus on one level at a time. Each level includes a visual representation and a description of the structures and stabilizing forces involved.

The Four Levels

Primary — The linear amino acid sequence, linked by peptide bonds
Secondary — Local folding patterns (alpha helices and beta sheets) stabilized by backbone hydrogen bonds
Tertiary — The 3D fold of a single polypeptide chain, stabilized by side-chain interactions
Quaternary — Multi-subunit complexes formed by the association of multiple polypeptide chains

How to Use

Toggle buttons — Click to show one structural level at a time
Read descriptions — Each level explains the structures, stabilizing forces, and associated data formats
Compare levels — Switch between levels to understand how each builds on the previous one

Iframe Embed Code

<iframe src="https://dmccreary.github.io/bioinformatics/sims/protein-structure-hierarchy/main.html"
        height="522"
        width="100%"
        scrolling="no"></iframe>

Lesson Plan

Grade Level

College introductory bioinformatics

Duration

10-15 minutes

Prerequisites

Knowledge of amino acids and peptide bonds
Understanding of molecular interactions (hydrogen bonds, hydrophobic effect)

Activities

Exploration (4 min): Toggle through each level and note the key stabilizing forces.
Guided Practice (4 min): For each level, name one bioinformatics tool or database that works with data at that level.
Assessment (4 min): Answer the questions below.

Assessment

What stabilizing forces are unique to tertiary structure that are not present in secondary structure?
Why does primary structure determine all higher levels of structure?
Not all proteins have quaternary structure. Give an example of a protein that does and one that does not.