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Uncontrolled bleeding can also occur in the setting of an overdose of the
anticoagulant heparin, leading to a need for compounds with anti-heparin
activity. A novel approach to this problem takes advantage of engineered
virus-like particles derived from bacteriophage Q¦Â (Udit et al. 2009). By
generating point mutations to the coat protein and covalent attachment of
poly-arginine peptides, the surface charge of the virus-like particles could
be widely varied since the capsid consists of 180 coat proteins. Using an
activated partial thrombin time clotting assay, they identifi ed modifi ed
particles that inhibited heparin-mediated anticoagulation by > 95%. The
inhibition is believed to be by presentation of regions with high positive
charge density to bind heparin¡¯s extensively sulfated domains

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