Cloned (Comment) | Organism |
---|---|
expression of PAFAH1B2 or PAFAH1B3 subunits in HEK-293T cells | Homo sapiens |
Inhibitors | Comment | Organism | Structure |
---|---|---|---|
methoxy arachidonyl fluorophosphonate | type 1 PAF acetylhydrolase is irreversibly inhibited | Homo sapiens | |
NaF | - |
Homo sapiens | |
platelet activating factor | competitive | Homo sapiens |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | Michaelis-Menten kinetics | Homo sapiens | |
1.13 | - |
Acetylsalicylic acid | recombinant catalytic subuit PAFAH1B2, pH 7.2, 37°C | Homo sapiens | |
2.17 | - |
Acetylsalicylic acid | native enzyme, pH 7.2, 37°C | Homo sapiens |
Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|
intracellular | - |
Homo sapiens | 5622 | - |
Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
---|---|---|---|
29000 | - |
1 * 45000, noncatalytic subunit, + 1 * 29000, subunit alpha1 or PAFAH1B3, + 1 * 30000, subunit alpha2 or PAFAH1B2, SDS-PAGE | Homo sapiens |
30000 | - |
1 * 45000, noncatalytic subunit, + 1 * 29000, subunit alpha1 or PAFAH1B3, + 1 * 30000, subunit alpha2 or PAFAH1B2, SDS-PAGE | Homo sapiens |
45000 | - |
1 * 45000, noncatalytic subunit, + 1 * 29000, subunit alpha1 or PAFAH1B3, + 1 * 30000, subunit alpha2 or PAFAH1B2, SDS-PAGE | Homo sapiens |
70000 | - |
native enzyme, gel filtration | Homo sapiens |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
acetylsalicylic acid + H2O | Homo sapiens | aspirin is hydrolyzed inside the erythrocytes, not in plasma | acetate + salicylate | - |
? | |
additional information | Homo sapiens | the type 1 PAF acetylhydrolase is one of three mammalian family members of the group 7 phospholipase A2 family, a family that is unique in that all members require a short sn-2 ester such as the acetyl ester of PAF | ? | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Homo sapiens | - |
- |
- |
Purification (Comment) | Organism |
---|---|
native enzyme 1400fold from erythrocytes by two different steps of anion exchange chromatography, followed by gel filtration, recombinant PAFAH1B2 or PAFAH1B3 subunits from HEK-293T cells | Homo sapiens |
Source Tissue | Comment | Organism | Textmining |
---|---|---|---|
erythrocyte | erythrocyte aspirin hydrolysis varies among individuals | Homo sapiens | - |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
acetylsalicylic acid + H2O | aspirin is hydrolyzed inside the erythrocytes, not in plasma | Homo sapiens | acetate + salicylate | - |
? | |
acetylsalicylic acid + H2O | activity of recombinant PAFAH1B2, but not its family member plasma PAF acetylhydrolase, hydrolyzes acetylsalicylic acid | Homo sapiens | acetate + salicylate | - |
? | |
additional information | the type 1 PAF acetylhydrolase is one of three mammalian family members of the group 7 phospholipase A2 family, a family that is unique in that all members require a short sn-2 ester such as the acetyl ester of PAF | Homo sapiens | ? | - |
? |
Subunits | Comment | Organism |
---|---|---|
More | type I PAF acetylhydrolase is a trimer of a noncatalytic 45 kDa protein subunit associated with two catalytic subunits, PAFAH1B3 and PAFAH1B2 as homo- or heterodimers | Homo sapiens |
trimer | 1 * 45000, noncatalytic subunit, + 1 * 29000, subunit alpha1 or PAFAH1B3, + 1 * 30000, subunit alpha2 or PAFAH1B2, SDS-PAGE | Homo sapiens |
Synonyms | Comment | Organism |
---|---|---|
aspirin hydrolase | - |
Homo sapiens |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
37 | - |
assay at | Homo sapiens |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
7.2 | - |
assay at | Homo sapiens |
Ki Value [mM] | Ki Value maximum [mM] | Inhibitor | Comment | Organism | Structure |
---|---|---|---|---|---|
0.29 | - |
platelet activating factor | recombinant catalytic subuit PAFAH1B2, pH 7.2, 37°C | Homo sapiens | |
0.47 | - |
platelet activating factor | native enzyme, pH 7.2, 37°C | Homo sapiens |
General Information | Comment | Organism |
---|---|---|
physiological function | type I platelet-activating factor acetylhydrolase is a phospholipase A2 with selectivity for acetyl residues of PAF, and acts as aspirin acetylhydrolase. The intracellular erythrocyte PAF acetylhydrolase 1 inactivates aspirin in blood, and is the major aspirin hydrolase of human blood | Homo sapiens |