FUNCTION: Heparin-dependent serine protease inhibitor acting in body fluids and secretions. Inactivates serine proteases by binding irreversibly to their serine activation site. Involved in the regulation of intravascular and extravascular proteolytic activities. Plays hemostatic roles in the blood ...
FUNCTION: Heparin-dependent serine protease inhibitor acting in body fluids and secretions. Inactivates serine proteases by binding irreversibly to their serine activation site. Involved in the regulation of intravascular and extravascular proteolytic activities. Plays hemostatic roles in the blood plasma. Acts as a procoagulant and pro-inflammatory factor by inhibiting the anticoagulant activated protein C factor as well as the generation of activated protein C factor by the thrombin/thrombomodulin complex. Acts as an anticoagulant factor by inhibiting blood coagulation factors like prothrombin, factor XI, factor Xa, plasma kallikrein and fibrinolytic enzymes such as tissue- and urinary-type plasminogen activators. In seminal plasma, inactivates several serine proteases implicated in the reproductive system. Inhibits the serpin acrosin; indirectly protects component of the male genital tract from being degraded by excessive released acrosin. Inhibits tissue- and urinary-type plasminogen activator, prostate-specific antigen and kallikrein activities; has a control on the sperm motility and fertilization. Inhibits the activated protein C-catalyzed degradation of SEMG1 and SEMG2; regulates the degradation of semenogelin during the process of transfer of spermatozoa from the male reproductive tract into the female tract. In urine, inhibits urinary-type plasminogen activator and kallikrein activities. Inactivates membrane-anchored serine proteases activities such as MPRSS7 and TMPRSS11E. Inhibits urinary-type plasminogen activator-dependent tumor cell invasion and metastasis. May also play a non-inhibitory role in seminal plasma and urine as a hydrophobic hormone carrier by its binding to retinoic acid. {ECO:0000269|PubMed:10340997, ECO:0000269|PubMed:11722589, ECO:0000269|PubMed:14696115, ECO:0000269|PubMed:15140131, ECO:0000269|PubMed:15328353, ECO:0000269|PubMed:15853774, ECO:0000269|PubMed:1725227, ECO:0000269|PubMed:18467335, ECO:0000269|PubMed:2844223, ECO:0000269|PubMed:3501295, ECO:0000269|PubMed:6323392, ECO:0000269|PubMed:7521127, ECO:0000269|PubMed:7548057, ECO:0000269|PubMed:8536714, ECO:0000269|PubMed:8665956, ECO:0000269|PubMed:9473218, ECO:0000269|PubMed:9510955, ECO:0000269|PubMed:9556620}.
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GO - Biological processes (BP):
fusion of sperm to egg plasma membrane involved in single fertilization [GO:0007342]; lipid transport [GO:0006869]; negative regulation of endopeptidase activity [GO:0010951]; negative regulation of hydrolase activity [GO:0051346]; spermatogenesis [GO:0007283]...
fusion of sperm to egg plasma membrane involved in single fertilization [GO:0007342]; lipid transport [GO:0006869]; negative regulation of endopeptidase activity [GO:0010951]; negative regulation of hydrolase activity [GO:0051346]; spermatogenesis [GO:0007283]
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GO - Molecular function (MF):
acrosin binding [GO:0032190]; glycosaminoglycan binding [GO:0005539]; heparin binding [GO:0008201]; phosphatidylcholine binding [GO:0031210]; protease binding [GO:0002020]; retinoic acid binding [GO:0001972]; serine-type endopeptidase inhibitor activity [GO:0004867]...
acrosin binding [GO:0032190]; glycosaminoglycan binding [GO:0005539]; heparin binding [GO:0008201]; phosphatidylcholine binding [GO:0031210]; protease binding [GO:0002020]; retinoic acid binding [GO:0001972]; serine-type endopeptidase inhibitor activity [GO:0004867]
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GO - Cellular component (CC):
acrosomal membrane [GO:0002080]; external side of plasma membrane [GO:0009897]; extracellular exosome [GO:0070062]; extracellular region [GO:0005576]; extracellular space [GO:0005615]; membrane [GO:0016020]; platelet alpha granule [GO:0031091]; platelet dense tubular network [GO:0031094]; protein C ...
acrosomal membrane [GO:0002080]; external side of plasma membrane [GO:0009897]; extracellular exosome [GO:0070062]; extracellular region [GO:0005576]; extracellular space [GO:0005615]; membrane [GO:0016020]; platelet alpha granule [GO:0031091]; platelet dense tubular network [GO:0031094]; protein C inhibitor-coagulation factor V complex [GO:0097181]; protein C inhibitor-coagulation factor Xa complex [GO:0097182]; protein C inhibitor-coagulation factor XI complex [GO:0097183]; protein C inhibitor-KLK3 complex [GO:0036029]; protein C inhibitor-plasma kallikrein complex [GO:0036030]; protein C inhibitor-PLAT complex [GO:0036026]; protein C inhibitor-PLAU complex [GO:0036027]; protein C inhibitor-thrombin complex [GO:0036028]; protein C inhibitor-TMPRSS11E complex [GO:0036025]; protein C inhibitor-TMPRSS7 complex [GO:0036024]; protein-containing complex [GO:0032991]
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