PMID: 1388011Oct 1, 1992

Phospholipid binding of annexin V: effects of calcium and membrane phosphatidylserine content

Archives of Biochemistry and Biophysics
Jonathan F Tait, Donald F Gibson

Abstract

We studied the binding of fluorescein-labeled annexin V (placental anticoagulant protein I) to small unilamellar phospholipid vesicles at 0.15 M ionic strength as a function of calcium concentration and membrane phosphatidylserine (PS) content. As the mole percentage of PS in the membrane increased from 10 to 50%, the stoichiometry of binding decreased hyperbolically from 1100 mol phospholipid/mol annexin V to a limiting value of 84 mol/mol for measurements made at 1.2 mM CaCl2. Over the same range of PS content, Kd remained approximately constant at 0.036 +/- 0.011 nM. A similar hyperbolic decrease in stoichiometry was observed with vesicles containing 10 or 20% PS when the calcium concentration was increased from 0.4 to 10 mM. Thus, the density of membrane binding sites is strongly dependent on the membrane PS content and calcium concentration. The effect of calcium on annexin V-membrane binding is proposed to be due to the formation of phospholipid-calcium complexes, to which the protein binds, rather than to an allosteric effect of calcium on protein-phospholipid affinity.

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Related Concepts

Annexin A5
Calcium
Phosphatidylserines
Structure-Activity Relationship
Pregnancy Proteins
Phospholipids
Niosomes
Calcium-Binding Proteins
Membranes, Artificial
ANXA5

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