9pai | pdb_00009pai
CLEAVED SUBSTRATE VARIANT OF PLASMINOGEN ACTIVATOR INHIBITOR-1
Structural highlights
Disease[PAI1_HUMAN] Defects in SERPINE1 are the cause of plasminogen activator inhibitor-1 deficiency (PAI-1D) [MIM:613329]. It is a hematologic disorder characterized by increased bleeding after trauma, injury, or surgery. Affected females have menorrhagia. The bleeding defect is due to increased fibrinolysis of fibrin blood clots due to deficiency of plasminogen activator inhibitor-1, which inhibits tissue and urinary activators of plasminogen.[1] Note=High concentrations of SERPINE1 seem to contribute to the development of venous but not arterial occlusions. Function[PAI1_HUMAN] Serine protease inhibitor. This inhibitor acts as 'bait' for tissue plasminogen activator, urokinase, protein C and matriptase-3/TMPRSS7. Its rapid interaction with PLAT may function as a major control point in the regulation of fibrinolysis.[2] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedPlasminogen activator inhibitor-1 (PAI-1) is unique among the serine proteinase inhibitors (serpins) in that it can adopt at least three different conformations (active, substrate and latent). We report the X-ray structure of a cleaved substrate variant of human PAI-1, which has a new beta-strand s4A formed by insertion of the amino-terminal portion of the reactive-site loop into beta-sheet A subsequent to cleavage. This is in contrast to the previous suggestion that the non-inhibitory function of substrate-type serpins is mainly due to an inability of the reactive-site loop to adopt this conformation. Comparison with the structure of latent PAI-1 provides insights into the molecular determinants responsible for the transition of the stressed active conformation to the thermostable latent conformation. Mechanisms contributing to the conformational and functional flexibility of plasminogen activator inhibitor-1.,Aertgeerts K, De Bondt HL, De Ranter CJ, Declerck PJ Nat Struct Biol. 1995 Oct;2(10):891-7. PMID:7552714[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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