Annexin V--heparin oligosaccharide complex suggests heparan sulfate--mediated assembly on cell surfaces

Structure
Ishan CapilaBarbara A Seaton

Abstract

Annexin V, an abundant anticoagulant protein, has been proposed to exert its effects by self-assembling into highly ordered arrays on phospholipid membranes to form a protective anti-thrombotic shield at the cell surface. The protein exhibits very high-affinity calcium-dependent interactions with acidic phospholipid membranes, as well as specific binding to glycosaminoglycans (GAGs) such as heparin and heparan sulfate, a major component of cell surface proteoglycans. At present, there is no structural information to elucidate this interaction or the role it may play in annexin V function at the cell surface. We report the 1.9 A crystal structure of annexin V in complex with heparin-derived tetrasaccharides. This structure represents the first of a heparin oligosaccharide binding to a protein where calcium ions are essential for the interaction. Two distinct GAG binding sites are situated on opposite protein surfaces. Basic residues at each site were identified from the structure and site-directed mutants were prepared. The heparin binding properties of these mutants were measured by surface plasmon resonance. The results confirm the roles of these mutated residues in heparin binding, and the kinetic and thermodynamic data defin...Continue Reading

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