biology / Molecules of Life / free

Protein Folding

See an amino-acid chain settle into the shape that lets it work.

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A sequence carries interaction preferences. The amino-acid order places hydrophobic, charged, and polar side chains along the chain. The sequence does not draw one shape directly; it constrains which contacts are energetically plausible.

protein foldinghydrophobic collapse · native 44%

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native fold44%

stability67%

exposed hydrophobics46%

misfolding4%

Hydrophobic drive 72%Thermal stress 24%Chaperone support 58%Molecular crowding 38%Folding time 72%

The sequence sets hydrophobicity at 72%, so collapse can bury non-polar residues while polar and charged residues remain exposed.

This is a normalized folding landscape, not a molecular-dynamics simulation. Real proteins sample many conformations and may use chaperones, co-translational folding, disulfide bonds, post-translational modifications, or degradation pathways.

04 / PRACTICE

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Answer from the model, then use the explanation to connect the visual mechanism to the biological rule.

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Protein Folding

Make the biology yours.

What does the amino-acid sequence constrain?