Annexin

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Function

Annexins are proteins which make a membrane scaffold. They bind negatively charged phospholipids and contain a 70 amino acid long annexin repeat. Annexins divide into species and are numbered from I to XII.

  • Annexin I is involved in a variety of pathways[1].
  • Annexin II is involved in angiogenesis, tutor progression and metastasis[2].
  • Annexin V is the most abundant scaffolding protein.
  • Annexin E1 (AnE1) is associated with tubulin in trophozoites of Giardia lamblia and forms local slubs in the flagella.
  • Annexin A-V has a major role in coagulation.
  • Annexin AII has a major role in fibrinolysis. Annexins bind phospholipids and Ca+2 ions. See also Ezetimibe.

Relevance

Annexin I is involved in anti-inflammatory responses and apoptotic mechanisms.

Structural highlights

Annexins consist of 2 domains - the C-terminal core and the N-terminal head. The containing . The core domain concave side contains the .[3]

3D structures of annexin

Annexin 3D structures


Rat annexin V complex with Ca+2 (green) and sulfate (PDB code 1n42)

Drag the structure with the mouse to rotate


ReferencesReferences

  1. Lim LH, Pervaiz S. Annexin 1: the new face of an old molecule. FASEB J. 2007 Apr;21(4):968-75. PMID:17215481 doi:10.1096/fj.06-7464rev
  2. Sharma MC, Sharma M. The role of annexin II in angiogenesis and tumor progression: a potential therapeutic target. Curr Pharm Des. 2007;13(35):3568-75. PMID:18220793 doi:10.2174/138161207782794167
  3. Mo Y, Campos B, Mealy TR, Commodore L, Head JF, Dedman JR, Seaton BA. Interfacial basic cluster in annexin V couples phospholipid binding and trimer formation on membrane surfaces. J Biol Chem. 2003 Jan 24;278(4):2437-43. Epub 2002 Oct 24. PMID:12401794 doi:10.1074/jbc.M210286200

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