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- Table of Contents
Facts about Bis(5'-adenosyl)-triphosphatase ENPP4.
Hydrolyzes extracellular Ap3A into AMP and ADP, and Ap4A into AMP and ATP.
Ap3A and Ap4A are diadenosine polyphosphates believed to induce proliferation of vascular smooth muscle cells.Acts as a procoagulant, mediating platelet aggregation at the site of nascent thrombus via release of ADP from Ap3A and activation of ADP receptors. .
| Human | |
|---|---|
| Gene Name: | ENPP4 |
| Uniprot: | Q9Y6X5 |
| Entrez: | 22875 |

| Belongs to: |
|---|
| nucleotide pyrophosphatase/phosphodiesterase family |

AP3Aase; EC 3.1; ectonucleotide pyrophosphatase/phosphodiesterase 4 (putative); E-NPP 4; ENPP4; ENPP-4; KIAA0879ectonucleotide pyrophosphatase/phosphodiesterase 4 (putative function); NPP-4; NPP4ectonucleotide pyrophosphatase/phosphodiesterase family member 4
Mass (kDA):
51.641 kDA

| Human | |
|---|---|
| Location: | 6p21.1 |
| Sequence: | 6; NC_000006.12 (46129989..46146688) |
Expressed on the surface of vascular endothelia.
Cell membrane; Single-pass type I membrane protein.





PMID: 11027689 by Gijsbers R., et al. Structural and catalytic similarities between nucleotide pyrophosphatases/phosphodiesterases and alkaline phosphatases.
PMID: 22995898 by Albright R.A., et al. NPP4 is a procoagulant enzyme on the surface of vascular endothelium.