The publication detail shows the title, authors (with indicators showing other profiled authors), information on the publishing organization, abstract and a link to the article in PubMed. This abstract is what is used to create the fingerprint of the publication. If any grants are referenced by the publication, they will be listed here as well.
Identification of coagulation factor VIII A2 domain residues forming the binding epitope for low-density lipoprotein receptor-related protein.
Andrey G Sarafanov; Evgeny M Makogonenko; Igor V Pechik; Klaus-Peter Radtke; Alexey V Khrenov; Natalya M Ananyeva; Dudley K Strickland; Evgueni L Saenko (Profiled Author: Dudley K Strickland)
Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA. firstname.lastname@example.org
Regulation of the coagulation factor VIII (fVIII) level in circulation involves a hepatic receptor low-density lipoprotein receptor-related protein (LRP). One of two major LRP binding sites in fVIII is located within the A2 domain (A2), likely exposed within the fVIII complex with von Willebrand factor and contributing to regulation of fVIII via LRP. This work aimed to identify A2 residues forming its LRP-binding site, previously shown to involve residues 484-509. Isolated A2 was subjected to alanine-scanning mutagenesis followed by expression of a set of mutants in a baculovirus system. In competition and surface plasmon resonance assays, affinities of A2 mutants K466A, R471A, R484A, S488A, R489A, R490A, H497A, and K499A for LRP were found to be decreased by 2-4-fold. This correlated with 1.3-1.5-fold decreases in the degree of LRP-mediated internalization of the mutants in cell culture. Combining these mutations into pairs led to cumulative effects, i.e., 7-13-fold decrease in affinity for LRP and 1.6-2.2-fold decrease in the degree of LRP-mediated internalization in cell culture. We conclude that the residues mentioned above play a key role in formation of the A2 binding epitope for LRP. Experiments in mice revealed an approximately 4.5 times shorter half-life for A2 in the circulation in comparison with that of fVIII. The half-lives of A2 mutant R471A/R484A or A2 co-injected with receptor-associated protein, a classical ligand of LRP, were prolonged by approximately 1.9 and approximately 3.5 times, respectively, compared to that of A2. This further confirms the importance of the mutated residues for interaction of A2 with LRP and suggests the existence of an LRP-dependent mechanism for removing A2 as a product of dissociation of activated fVIII from the circulation.
1 Originating Grant
STRICKLAND, DUDLEY K.
1 April 2003 - 31 March 2014
NATIONAL HEART, LUNG, AND BLOOD INSTITUTE
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Andrey G Sarafanov; Evgeny M Makogonenko; Olav M Andersen; Irina A Mikhailenko; Natalya M Ananyeva; Alexey V Khrenov; Midori Shima; Dudley K Strickland; Evgueni L SaenkoThrombosis and haemostasis 2007;98(6):1170-81.
A Kinoshita; C M Whelan; C J Smith; I Mikhailenko; G W Rebeck; D K Strickland; B T Hyman
Demonstration by fluorescence resonance energy transfer of two sites of interaction between the low-density lipoprotein receptor-related protein and the amyloid precursor protein: role of the intracellular adapter protein Fe65.The Journal of neuroscience : the official journal of the Society for Neuroscience 2001;21(21):8354-61.
A G Zdanovsky; M V Zdanovskaia; D Strickland; D J FitzGeraldThe Journal of biological chemistry 1996;271(11):6122-8.
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