The physical process by which a protein chain assumes its functional three-dimensional structure from its linear amino acid sequence. This process is guided by thermodynamic principles and often assisted by cellular machinery.
The concept emerged in the 1960s with Christian Anfinsen's Nobel Prize-winning work showing that protein sequence determines structure. The term 'folding' was borrowed from origami-like imagery of a linear chain organizing into complex shapes.
Imagine trying to fold a 300-bead necklace into a specific complex shape in a crowded room full of other necklaces - that's what every protein faces inside a cell! The fact that most proteins fold correctly most of the time is one of biology's most remarkable achievements.
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