Immunoglobulin fold
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An immunoglobulin fold is a common all-β protein fold that consists of a 2-layer sandwich of ~7 antiparallel β-strands arranged in two β-sheets.
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.
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| Protein tertiary structure | ||
|---|---|---|
| General: | Structural domain | Protein folding | |
| All-α folds: | Helix bundle | Globin fold | Homeodomain fold | Alpha solenoid | |
| All-β folds: | Immunoglobulin fold | Beta barrel | Beta-propeller domain | |
| α/β folds: | TIM barrel | Leucine-rich repeat | Flavodoxin fold | Thioredoxin fold | Trefoil knot fold | |
| α+β folds: | Ferredoxin fold | Ribonuclease A | SH2-like fold | |
| Irregular folds: | Conotoxin | |
| ←Secondary structure | Structure determination methods | Quaternary structure→ |
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