Faktor XIII

Koagulering faktor XIII dimer, Human blood.

Faktor XIII (13), även fibrinstabiliserande faktor (FSF), är ett protein som ingår i blodkoaguleringen. Den aktiveras av trombin och tillsammans med kalcium stabiliserar den fibrin till ett starkare koagel.

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Inactive human blood clotting factor XIII (PDB: 1EVU), a transglutaminase. Homodimer of catalytic A1 peptides (gene F13A1) is shown. XIII in human blood is actually a heterotetramer of 2 A1 peptides and 2 B peptides (gene F13B). B peptides are not shown, but would form a ring-like structure around the A1 dimer.

N- & C-terminals are shown as "N" and "C". Protein on the left is rotated 90° about its y-axis and the result is on the right.

Domains:

  • Magenta (N-terminal): activation peptide, which is removed when XIII is activated to XIIIa
  • Cyan: β-sandwich
  • Green: catalytic core (orange: catalytic amino acid residues C314, H373-D396 and W279 are shown)
  • Blue: β-barrel 1
  • Red (C-terminal): β-barrel 2

Sructure from www.rcsb.org. Source for info: