- EMDB-26060: Cryo-em structure of human prothrombin:prothrombinase at 4.1 Angs... -
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Entry
Database: EMDB / ID: EMD-26060
Title
Cryo-em structure of human prothrombin:prothrombinase at 4.1 Angstrom resolution
Map data
prothrombin:prothrombinase
Sample
Complex: prothrombin prothrombinase
Complex: Prothrombin (E.C.3.4.21.5), Factor X light chain, Activated factor Xa heavy chain
Protein or peptide: Prothrombin
Protein or peptide: Factor X light chain
Protein or peptide: Activated factor Xa heavy chain
Complex: Coagulation factor Va
Protein or peptide: Coagulation factor Va
Protein or peptide: Coagulation factor Va
Function / homology
Function and homology information
response to vitamin K / coagulation factor Xa / platelet alpha granule / Cargo concentration in the ER / Defective factor IX causes thrombophilia / Defective cofactor function of FVIIIa variant / Defective F9 variant does not activate FX / blood circulation / Extrinsic Pathway of Fibrin Clot Formation / COPII-mediated vesicle transport ...response to vitamin K / coagulation factor Xa / platelet alpha granule / Cargo concentration in the ER / Defective factor IX causes thrombophilia / Defective cofactor function of FVIIIa variant / Defective F9 variant does not activate FX / blood circulation / Extrinsic Pathway of Fibrin Clot Formation / COPII-mediated vesicle transport / positive regulation of leukocyte chemotaxis / positive regulation of lipid kinase activity / positive regulation of phospholipase C-activating G protein-coupled receptor signaling pathway / cytolysis by host of symbiont cells / thrombospondin receptor activity / Defective factor XII causes hereditary angioedema / COPII-coated ER to Golgi transport vesicle / thrombin / regulation of blood coagulation / neutrophil-mediated killing of gram-negative bacterium / ligand-gated ion channel signaling pathway / Defective F8 cleavage by thrombin / Platelet Aggregation (Plug Formation) / negative regulation of astrocyte differentiation / negative regulation of platelet activation / positive regulation of TOR signaling / positive regulation of collagen biosynthetic process / negative regulation of cytokine production involved in inflammatory response / positive regulation of blood coagulation / negative regulation of fibrinolysis / Gamma-carboxylation of protein precursors / Transport of gamma-carboxylated protein precursors from the endoplasmic reticulum to the Golgi apparatus / Common Pathway of Fibrin Clot Formation / Removal of aminoterminal propeptides from gamma-carboxylated proteins / fibrinolysis / regulation of cytosolic calcium ion concentration / Intrinsic Pathway of Fibrin Clot Formation / endoplasmic reticulum-Golgi intermediate compartment membrane / Peptide ligand-binding receptors / positive regulation of release of sequestered calcium ion into cytosol / platelet alpha granule lumen / acute-phase response / Regulation of Complement cascade / negative regulation of proteolysis / Cell surface interactions at the vascular wall / lipopolysaccharide binding / Post-translational protein phosphorylation / positive regulation of receptor signaling pathway via JAK-STAT / growth factor activity / positive regulation of insulin secretion / platelet activation / phospholipid binding / response to wounding / positive regulation of protein localization to nucleus / Golgi lumen / antimicrobial humoral immune response mediated by antimicrobial peptide / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / positive regulation of reactive oxygen species metabolic process / blood coagulation / extracellular vesicle / Thrombin signalling through proteinase activated receptors (PARs) / Platelet degranulation / signaling receptor activity / heparin binding / regulation of cell shape / positive regulation of cell growth / G alpha (q) signalling events / collagen-containing extracellular matrix / positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction / cell surface receptor signaling pathway / blood microparticle / positive regulation of cell migration / positive regulation of protein phosphorylation / G protein-coupled receptor signaling pathway / copper ion binding / endoplasmic reticulum lumen / external side of plasma membrane / serine-type endopeptidase activity / signaling receptor binding / calcium ion binding / positive regulation of cell population proliferation / proteolysis / extracellular space / extracellular exosome / extracellular region / membrane / plasma membrane Similarity search - Function
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
United States
Citation
Journal: Blood / Year: 2022 Title: Cryo-EM structure of the prothrombin-prothrombinase complex. Authors: Eliza A Ruben / Brock Summers / Michael J Rau / James A J Fitzpatrick / Enrico Di Cera / Abstract: The intrinsic and extrinsic pathways of the coagulation cascade converge to a common step where the prothrombinase complex, comprising the enzyme factor Xa (fXa), the cofactor fVa, Ca2+ and ...The intrinsic and extrinsic pathways of the coagulation cascade converge to a common step where the prothrombinase complex, comprising the enzyme factor Xa (fXa), the cofactor fVa, Ca2+ and phospholipids, activates the zymogen prothrombin to the protease thrombin. The reaction entails cleavage at 2 sites, R271 and R320, generating the intermediates prethrombin 2 and meizothrombin, respectively. The molecular basis of these interactions that are central to hemostasis remains elusive. We solved 2 cryogenic electron microscopy (cryo-EM) structures of the fVa-fXa complex, 1 free on nanodiscs at 5.3-Å resolution and the other bound to prothrombin at near atomic 4.1-Å resolution. In the prothrombin-fVa-fXa complex, the Gla domains of fXa and prothrombin align on a plane with the C1 and C2 domains of fVa for interaction with membranes. Prothrombin and fXa emerge from this plane in curved conformations that bring their protease domains in contact with each other against the A2 domain of fVa. The 672ESTVMATRKMHDRLEPEDEE691 segment of the A2 domain closes on the protease domain of fXa like a lid to fix orientation of the active site. The 696YDYQNRL702 segment binds to prothrombin and establishes the pathway of activation by sequestering R271 against D697 and directing R320 toward the active site of fXa. The cryo-EM structure provides a molecular view of prothrombin activation along the meizothrombin pathway and suggests a mechanism for cleavage at the alternative R271 site. The findings advance our basic knowledge of a key step of coagulation and bear broad relevance to other interactions in the blood.
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