The backbone switches repeatedly between the two β-sheets. Typically, the pattern is (N-terminal β-hairpin in sheet 1)-(β-hairpin in sheet 2)-(β-strand in sheet 1)-(C-terminal β-hairpin in sheet 2). The cross-overs between sheets form an "X", so that the N- and C-terminal hairpins are facing each other.
Protein tertiary structure
|General||Structural domain | Protein folding | Structure determination methods|
|All-α folds:||Helix bundle | Globin fold | Homeodomain fold | Alpha solenoid|
|All-β folds:||Immunoglobulin fold | Beta barrel | Beta-propeller|
|α/β folds:||TIM barrel | Leucine-rich repeat | Flavodoxin fold | Rossmann fold | Thioredoxin fold | Trefoil knot fold|
|α+β folds:||DNA clamp | Ferredoxin fold | Ribonuclease A | SH2-like fold|
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