Abstract
Reversible membrane binding of γ-carboxyglutamic acid (Gla)-containing coagulation factors requires Ca2+-binding to 10–12 Gla residues. Here we describe the solution structure of the Ca2+-free Gla-EGF domain pair of factor X which reveals a striking difference between the Ca2+-free and Ca2+-loaded forms. In the Ca2+-free form Gla residues are exposed to solvent and Phe 4, Leu 5 and Val 8 form a hydrophobic cluster in the interior of the domain. In the Ca2+-loaded form Gla residues ligate Ca22+ in the core of the domain pushing the side-chains of the three hydrophobic residues into the solvent. We propose that the Ca2+-induced exposure of hydrophobic side chains is crucial for membrane binding of Gla-containing coagulation proteins.
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Sunnerhagen, M., Forsén, S., Hoffrén, AM. et al. Structure of the Ca2+-free GLA domain sheds light on membrane binding of blood coagulation proteins. Nat Struct Mol Biol 2, 504–509 (1995). https://doi.org/10.1038/nsb0695-504
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DOI: https://doi.org/10.1038/nsb0695-504
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