Almost every step in blood coagulation requires assembly of multiple proteins on membrane surfaces, yet protein-membrane interactions in blood clotting remain poorly understood at the molecular level. We are using new, high-resolution technologies including magic-angle spinning solid-state NMR (SSNMR) to probe the mechanisms by which blood clotting proteins interact with phospholipid surfaces, and how changes in membrane composition regulate clotting reactions. The primary focus of our studies is the membrane-bound complex of tissue factor and factor VIIa, the two-subunit enzyme responsible for triggering blood clotting in health and disease.
Aim 1 will delineate, at atomic resolution, the changes in structure and dynamics of PS- rich membrane domains in the presence of Ca2+, and will examine the roles of phosphatidylserine, phosphatidylcholine and phosphatidylethanolamine in configuring the membrane to support high affinity binding of clotting factors.
Aim 2 will investigate the role of phospholipid-phospholipid interactions in enhancing blood clotting reactions on membrane surfaces.
Aim 3 will delineate the lipid environments/conformations induced when clotting proteins bind to bilayers.
Aim 4 will solve the structure of tissue factor on the membrane surface and identify conformational changes in tissue factor when it interacts with ligands. Together these studies will provide valuable new insights into the role of the membrane surface in blood clotting, at atomic-scale resolution.

Public Health Relevance

Disorders of the blood clotting system represent the leading cause of disability and death in the United States, but we still have a very incomplete understanding of blood clotting reactions at the molecular level. These studies will shed new light on the regulation of the blood clotting system, with a particular focus on achieving a detailed understanding of how and why blood clotting reactions occur on membrane surfaces.

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Research Project (R01)
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Hemostasis and Thrombosis Study Section (HT)
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Link, Rebecca P
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University of Illinois Urbana-Champaign
Schools of Arts and Sciences
United States
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Tavoosi, Narjes; Morrissey, James H (2014) Influence of membrane composition on the enhancement of factor VIIa/tissue factor activity by magnesium ions. Thromb Haemost 111:770-2
Ke, Ke; Yuan, Jian; Morrissey, James H (2014) Tissue factor residues that putatively interact with membrane phospholipids. PLoS One 9:e88675
Watt, Eric D; Rienstra, Chad M (2014) Recent advances in solid-state nuclear magnetic resonance techniques to quantify biomolecular dynamics. Anal Chem 86:58-64
Tavoosi, Narjes; Smith, Stephanie A; Davis-Harrison, Rebecca L et al. (2013) Factor VII and protein C are phosphatidic acid-binding proteins. Biochemistry 52:5545-52
Sperling, Lindsay J; Tang, Ming; Berthold, Deborah A et al. (2013) Solid-state NMR study of a 41 kDa membrane protein complex DsbA/DsbB. J Phys Chem B 117:6052-60
Tang, Ming; Nesbitt, Anna E; Sperling, Lindsay J et al. (2013) Structure of the disulfide bond generating membrane protein DsbB in the lipid bilayer. J Mol Biol 425:1670-82
Nuzzio, Kristin M; Cullinan, David B; Novakovic, Valerie A et al. (2013) Backbone resonance assignments of the C2 domain of coagulation factor VIII. Biomol NMR Assign 7:31-4
Tang, Ming; Comellas, Gemma; Rienstra, Chad M (2013) Advanced solid-state NMR approaches for structure determination of membrane proteins and amyloid fibrils. Acc Chem Res 46:2080-8
Morrissey, James H; Tajkhorshid, Emad; Sligar, Stephen G et al. (2012) Tissue factor/factor VIIa complex: role of the membrane surface. Thromb Res 129 Suppl 2:S8-10
Tavoosi, Narjes; Davis-Harrison, Rebecca L; Pogorelov, Taras V et al. (2011) Molecular determinants of phospholipid synergy in blood clotting. J Biol Chem 286:23247-53

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