1cfg

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MEMBRANE-BINDING PEPTIDE FROM THE C2 DOMAIN OF FACTOR VIII FORMS AN AMPHIPATHIC STRUCTURE AS DETERMINED BY NMR SPECTROSCOPY

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

Factor VIII binds to cell membranes prior to assembling with the serine, protease, factor IXa, to form the factor X-activating enzyme complex. In, order to better understand the interaction between factor VIII and, phosphatidylserine-containing membranes, we have synthesized the, membrane-binding peptide from the C2 domain of factor VIII, corresponding, to residues 2303-2324. The peptide, fVIII2303-24, with a primary structure, of TRYLRIHPQSWVHQIALRMEVL, aggregates at concentrations above 2 microM at, pH 7 but is soluble at pH 6. fVIII2303-24 competes with, fluorescein-labeled factor VIII (Ki = 3 microM) for binding sites on, synthetic phosphatidylserine-containing membranes and for binding sites on, stimulated platelets. Circular dichroism spectra indicate that, fVIII2303-24 is predominantly a random coil in aqueous solution but adopts, a predominantly helical conformation upon interaction with SDS micelles., 1H NMR spectroscopy in the presence of SDS micelles allowed estimation of, interproton distances from the nuclear Overhauser effect and estimation of, torsion angles from coupling constants indicated by splitting of resonance, lines. The distance and angle estimates, processed by distance, geometry/simulated annealing software, indicate that fVIII2303-24 has an, alpha-helical segment encompassing residues P8-E20 and an extended segment, encompassing residues L4-P8. The location of six hydrophobic residues on, one face of the structure suggests that hydrophobic interactions, contribute to membrane-binding. In addition, two arginines penetrate the, hydrophobic plane suggesting that they interact with phosphate moieties in, a phospholipid bilayer.

Disease

Known diseases associated with this structure: Hemophilia A OMIM:[306700]

About this Structure

1CFG is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Membrane-binding peptide from the C2 domain of factor VIII forms an amphipathic structure as determined by NMR spectroscopy., Gilbert GE, Baleja JD, Biochemistry. 1995 Mar 7;34(9):3022-31. PMID:7893714

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