Adhesion mechanism of human beta 2-glycoprotein I to phospholipids based on its crystal structure

B Bouma, P G de Groot, J M H van den Elsen, R B G Ravelli, A Schouten, M J A Simmelink, R H W M Derksen, J Kroon, P Gros

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Human beta2-glycoprotein I is a heavily glycosylated five-domain plasma membrane-adhesion protein, which has been implicated in blood coagulation and clearance of apoptotic bodies from the circulation. It is also the key antigen in the autoimmune disease anti-phospholipid syndrome. The crystal structure of beta2-glycoprotein I isolated from human plasma reveals an elongated fish-hook-like arrangement of the globular short consensus repeat domains. Half of the C-terminal fifth domain deviates strongly from the standard fold, as observed in domains one to four. This aberrant half forms a specific phospholipid-binding site. A large patch of 14 positively charged residues provides electrostatic interactions with anionic phospholipid headgroups and an exposed membrane-insertion loop yields specificity for lipid layers. The observed spatial arrangement of the five domains suggests a functional partitioning of protein adhesion and membrane adhesion over the N- and C-terminal domains, respectively, separated by glycosylated bridging domains. Coordinates are in the Protein Data Bank
Original languageEnglish
Pages (from-to)5166-5174
Number of pages9
JournalThe EMBO Journal
Issue number19
Publication statusPublished - 1999


Cite this

Bouma, B., de Groot, P. G., van den Elsen, J. M. H., Ravelli, R. B. G., Schouten, A., Simmelink, M. J. A., ... Gros, P. (1999). Adhesion mechanism of human beta 2-glycoprotein I to phospholipids based on its crystal structure. The EMBO Journal, 18(19), 5166-5174.