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Literature summary extracted from
- The heparin-binding exosite is critical to allosteric activation of factor IXa in the intrinsic tenase complex: the role of arginine 165 and factor X (2007), Biochemistry, 46, 7886-7895.
Activating Compound
| EC Number | Activating Compound | Comment | Organism | Structure |
|---|---|---|---|---|
| 3.4.21.22 | Factor VIIIa | factor IXa acts as part of phosphocholine/phosphoserine vesicles interacting with factor VIIIa in the intrinsic tenase complex | Homo sapiens | |
| 3.4.21.22 | heparin | activates by mediating cofactor binding, heparin binds to an exosite on the factor IXa protease domain, the factor IXa heparin-binding exosite participates in both cofactor binding and protease activation, and cofactor affinity is linked to active site conformation and factor X interaction during enzyme assembly, overview | Homo sapiens |  |
| 3.4.21.22 | Phospholipids | factor IXa acts as part of phosphocholine/phosphoserine vesicles interacting with factor VIIIa in the intrinsic tenase complex | Homo sapiens | |
Cloned(Commentary)
| EC Number | Cloned (Comment) | Organism |
|---|---|---|
| 3.4.21.22 | stable expression of wild-type and mutant enzymes in HEK-293 cells | Homo sapiens |
Protein Variants
| EC Number | Protein Variants | Comment | Organism |
|---|---|---|---|
| 3.4.21.22 | K126A | site-directed mutagenesis, mutation in the heparin-binding exosite, the mutant shows reduced activity and altered tenase complex formation kinetics compared to the wild-type enzyme | Homo sapiens |
| 3.4.21.22 | K132A | site-directed mutagenesis, surface residue mutation, the mutant shows reduced activity and altered tenase complex formation kinetics compared to the wild-type enzyme | Homo sapiens |
| 3.4.21.22 | N129A | site-directed mutagenesis, surface residue mutation, the mutant shows reduced activity and altered tenase complex formation kinetics compared to the wild-type enzyme | Homo sapiens |
| 3.4.21.22 | N178A | site-directed mutagenesis, mutation in the heparin-binding exosite, the mutant shows reduced activity and altered tenase complex formation kinetics compared to the wild-type enzyme | Homo sapiens |
| 3.4.21.22 | R165A | site-directed mutagenesis, mutation in the heparin-binding exosite, the mutant shows reduced activity and altered tenase complex formation kinetics compared to the wild-type enzyme | Homo sapiens |
Inhibitors
| EC Number | Inhibitors | Comment | Organism | Structure |
|---|---|---|---|---|
| 3.4.21.22 | antithrombin III | - |
Homo sapiens |
KM Value [mM]
| EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 3.4.21.22 | additional information | - |
additional information | kinetic determination of the affinity for factor IXa-factor VIIIa complex formation, effect of ethylene glycol at 30% on reaction kinetics, overview | Homo sapiens | |
| 3.4.21.22 | 0.000001 | - |
Factor X | pH 7.4, 22°C, recombinant mutant N178A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.0000052 | - |
Factor X | pH 7.4, 22°C, recombinant mutant R165A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.0000073 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K126A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.0000085 | - |
Factor X | pH 7.4, 22°C, recombinant mutants N129A and K132A, each in the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.0000096 | - |
Factor X | pH 7.4, 22°C, recombinant wild-type enzyme the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.000048 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K132A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.000055 | - |
Factor X | pH 7.4, 22°C, recombinant wild-type enzyme the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.000061 | - |
Factor X | pH 7.4, 22°C, recombinant mutant N129A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.000067 | - |
Factor X | pH 7.4, 22°C, recombinant mutant R165A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.00008 | - |
Factor X | pH 7.4, 22°C, recombinant mutant N178A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 0.000089 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K126A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens |
Localization
| EC Number | Localization | Comment | Organism | GeneOntology No. | Textmining |
|---|---|---|---|---|---|
| 3.4.21.22 | extracellular | - |
Homo sapiens | - |
- |
Metals/Ions
| EC Number | Metals/Ions | Comment | Organism | Structure |
|---|---|---|---|---|
| 3.4.21.22 | Ca2+ | activates | Homo sapiens | |
| 3.4.21.22 | Na+ | activates | Homo sapiens | |
Natural Substrates/ Products (Substrates)
| EC Number | Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 3.4.21.22 | factor X + H2O | Homo sapiens | the enzyme is part of the coagulation cascade, factor X activation by the intrinsic tenase complex, factor IXa-factor VIIIa, is the rate-limiting step for thrombin generation | activated factor X + ? | - |
? | |
Organism
| EC Number | Organism | UniProt | Comment | Textmining |
|---|---|---|---|---|
| 3.4.21.22 | Homo sapiens | - |
- |
- |
Posttranslational Modification
| EC Number | Posttranslational Modification | Comment | Organism |
|---|---|---|---|
| 3.4.21.22 | proteolytic modification | purified factor IX is activated with human factor XIa | Homo sapiens |
Source Tissue
| EC Number | Source Tissue | Comment | Organism | Textmining |
|---|---|---|---|---|
| 3.4.21.22 | commercial preparation | from plasma | Homo sapiens | - |
| 3.4.21.22 | plasma | - |
Homo sapiens | - |
Specific Activity [micromol/min/mg]
| EC Number | Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
|---|---|---|---|---|
| 3.4.21.22 | additional information | - |
relative coagulation and amidolytic activities of recombinant wild-type and mutant enzymes, overview | Homo sapiens |
Substrates and Products (Substrate)
| EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|---|
| 3.4.21.22 | factor X + H2O | the enzyme is part of the coagulation cascade, factor X activation by the intrinsic tenase complex, factor IXa-factor VIIIa, is the rate-limiting step for thrombin generation | Homo sapiens | activated factor X + ? | - |
? | |
| 3.4.21.22 | factor X + H2O | factor IXa acts as part of phosphocholine/phosphoserine vesicles interacting with factor VIIIa in the intrinsic tenase complex, the factor IXa heparin-binding exosite participates in both cofactor binding and protease activation, and cofactor affinity is linked to active site conformation and factor X interaction during enzyme assembly, overview | Homo sapiens | activated factor X + ? | - |
? | |
| 3.4.21.22 | Pefachrome IXa + H2O | commercial chromogenic substrate | Homo sapiens | ? | - |
? | |
Synonyms
| EC Number | Synonyms | Comment | Organism |
|---|---|---|---|
| 3.4.21.22 | factor IXa | - |
Homo sapiens |
Temperature Optimum [°C]
| EC Number | Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|---|
| 3.4.21.22 | 22 | - |
assay at room temperature | Homo sapiens |
Turnover Number [1/s]
| EC Number | Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|---|
| 3.4.21.22 | 1.9 | - |
Factor X | pH 7.4, 22°C, recombinant mutant R165A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 5.08 | - |
Factor X | pH 7.4, 22°C, recombinant mutant N178A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 5.2 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K126A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 5.47 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K132A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 5.51 | - |
Factor X | pH 7.4, 22°C, recombinant wild-type enzyme the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 5.6 | - |
Factor X | pH 7.4, 22°C, recombinant mutant N129A the intrinsic tenase complex, in absence of ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 600 | - |
Factor X | pH 7.4, 22°C, recombinant mutant N178A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 1000 | - |
Factor X | pH 7.4, 22°C, recombinant mutant R165A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 1340 | - |
Factor X | pH 7.4, 22°C, recombinant wild-type enzyme and mutant N129A, each in the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 1780 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K132A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens | |
| 3.4.21.22 | 1999 | - |
Factor X | pH 7.4, 22°C, recombinant mutant K126A the intrinsic tenase complex, in presence of 30% ethylene glycol | Homo sapiens |
pH Optimum
| EC Number | pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|---|
| 3.4.21.22 | 7.4 | - |
assay at | Homo sapiens |
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