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  3. ENPP1

ENPP1 (Ectonucleotide pyrophosphatase/phosphodiesterase 1)

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Summary of ENPP1

The ENPP1 gene provides encodes a protein called ectonucleotide pyrophosphatase/phosphodiesterase 1. It helps break down extracellular ATP. This helps prevent the accumulation of abnormal deposits of calcium and other minerals in the body. It also helps control cell signaling in response to insulin (R). 

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The Function of ENPP1

By generating PPi, plays a role in regulating pyrophosphate levels, and functions in bone mineralization and soft tissue calcification. PPi inhibits mineralization by binding to nascent hydroxyapatite (HA) crystals, thereby preventing further growth of these crystals. Preferentially hydrolyzes ATP, but can also hydrolyze other nucleoside 5' triphosphates such as GTP, CTP, TTP and UTP to their corresponding monophosphates with release of pyrophosphate and diadenosine polyphosphates, and also 3',5'-cAMP to AMP. May also be involved in the regulation of the availability of nucleotide sugars in the endoplasmic reticulum and Golgi, and the regulation of purinergic signaling. Appears to modulate insulin sensitivity and function.

Protein names

Recommended name:

Ectonucleotide pyrophosphatase/phosphodiesterase family member 1

Alternative name(s):

E-NPP 1
Membrane component chromosome 6 surface marker 1
Phosphodiesterase I/nucleotide pyrophosphatase 1
Plasma-cell membrane glycoprotein PC-1
NPPase
Nucleotide diphosphatase

ENPP1 SNPs

    To see your genotype, you should be logged in and have a file with your genotype uploaded.

  1. RS1044498 (ENPP1) ??
  2. RS1799774 (ENPP1) ??
  3. RS1800949 (ENPP1) ??
  4. RS1974201 (ENPP1) ??
  5. RS28933977 (ENPP1) ??
  6. RS6907728 (ENPP1) ??
  7. RS7754561 (ENPP1) ??
  8. RS9402349 (ENPP1) ??
  9. RS997509 (ENPP1) ??

Top Gene-Substance Interactions

ENPP1 Interacts with These Diseases

Disease Score

Substances That Increase ENPP1

Substances Interaction Organism Category

Substances That Decrease ENPP1

Substances Interaction Organism Category

Advanced Summary

     Cole disease At least three ENPP1 gene mutations have been identified in people with Cole disease. People with this disorder have areas of unusually light-colored skin (hypopigmentation), typically on the arms and legs, and spots of thickened skin on the palms of the hands and the soles of the feet (punctate palmoplantar keratoderma). The ENPP1 gene mutations that cause Cole disease change the structure of the SMB2 domain, which alters its interaction with the insulin receptor and affects cell signaling. The resulting impairment of ENPP1's role in melanin transport and keratinocyte development leads to hypopigmentation and keratoderma. The mutations may also impair the protein's ability to control calcification, which likely accounts for the abnormal calcium deposits that occur in some people with this disorder. For reasons that are unclear, the changes in insulin signaling resulting from these ENPP1 gene mutations do not seem to affect blood sugar control. generalized arterial calcification of infancy More than 40 mutations in the ENPP1 gene have been identified in individuals with generalized arterial calcification of infancy (GACI), a life-threatening disorder characterized by calcification in the blood vessels that carry blood from the heart to the rest of the body (the arteries). The mutations that cause GACI are thought to impair the ENPP1 protein's role in extracellular ATP breakdown and the production of pyrophosphate. Reduced availability of pyrophosphate likely interferes with the control of calcification in the body and leads to the signs and symptoms of GACI. hereditary hypophosphatemic rickets Genetics Home Reference provides information about hereditary hypophosphatemic rickets. other disorders A normal variation (polymorphism) in the ENPP1 gene has been associated with an increased risk of type 2 diabetes mellitus (the most common form of diabetes). Type 2 diabetes is caused by resistance to the hormone insulin, which results in impaired control of blood sugar. The polymorphism associated with type 2 diabetes leads to the production of a protein with the protein building block (amino acid) glutamine in protein position 121, written as Q121, rather than the amino acid lysine in this position (K121). The Q121 variant of the ENPP1 protein inhibits the function of the insulin receptor more strongly than the K121 version, increasing insulin resistance and the risk of type 2 diabetes.

     The ENPP1 gene provides instructions for making a protein called ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1). The ENPP1 protein helps break down a molecule called adenosine triphosphate (ATP), specifically when it is found outside the cell (extracellular). Extracellular ATP is quickly broken down into other molecules called adenosine monophosphate (AMP) and pyrophosphate. Pyrophosphate is important in preventing the accumulation of abnormal deposits of calcium (calcification) and other minerals (mineralization) in the body. The ENPP1 protein also plays a role in controlling cell signaling in response to the hormone insulin, through interaction between a part of the ENPP1 protein called the SMB2 domain and the insulin receptor. The insulin receptor is a protein that attaches (binds) to insulin and initiates cell signaling. Insulin plays many roles in the body, including regulating blood sugar levels by controlling how much sugar (in the form of glucose) is passed from the bloodstream into cells to be used as energy. Cell signaling in response to insulin is also important for the maintenance of the outer layer of skin (the epidermis). It helps control the transport of the pigment melanin from the cells in which it is produced (melanocytes) to epidermal cells called keratinocytes, and it is also involved in the development of keratinocytes.

Conditions with Increased Gene Activity

Condition Change (log2fold) Comparison Species Experimental variables Experiment name

Conditions with Decreased Gene Activity

Condition Change (log2fold) Comparison Species Experimental variables Experiment name

Technical

The following transcription factors affect gene expression:

  • Evi-1
  • HNF-1A
  • Egr-1
  • HNF-1
  • FAC1
  • Bach1
  • Egr-2
  • Bach2
  • ATF6

Tissue specificity:

Expressed in plasma cells and also in a number of non-lymphoid tissues, including the distal convoluted tubule of the kidney, chondrocytes and epididymis.

Gene Pathways:

  • Metabolic pathways
  • Metabolism
  • Disease
  • Purine metabolism
  • Starch and sucrose metabolism
  • Riboflavin metabolism
  • Nicotinate and nicotinamide metabolism
  • Pantothenate and CoA biosynthesis

Caution:

It is uncertain whether Met-1 or Met-53 is the initiator.

Enzyme Regulation:

At low concentrations of ATP, a phosphorylated intermediate is formed which inhibits further hydrolysis.

Cofactor:

Binds 2 Zn(2+) ions per subunit.

Molecular Function:

  • 3'-Phosphoadenosine 5'-Phosphosulfate Binding
  • Atp Binding
  • Calcium Ion Binding
  • Insulin Receptor Binding
  • Nadh Pyrophosphatase Activity
  • Nucleic Acid Binding
  • Nucleoside-Triphosphate Diphosphatase Activity
  • Nucleotide Diphosphatase Activity
  • Phosphodiesterase I Activity
  • Polysaccharide Binding
  • Protein Homodimerization Activity
  • Scavenger Receptor Activity
  • Zinc Ion Binding

Biological Processes:

  • 3'-Phosphoadenosine 5'-Phosphosulfate Metabolic Process
  • Biomineral Tissue Development
  • Cellular Phosphate Ion Homeostasis
  • Cellular Response To Insulin Stimulus
  • Generation Of Precursor Metabolites And Energy
  • Immune Response
  • Inorganic Diphosphate Transport
  • Negative Regulation Of Cell Growth
  • Negative Regulation Of Fat Cell Differentiation
  • Negative Regulation Of Glucose Import
  • Negative Regulation Of Glycogen Biosynthetic Process
  • Negative Regulation Of Insulin Receptor Signaling Pathway
  • Negative Regulation Of Protein Autophosphorylation
  • Nucleoside Triphosphate Catabolic Process
  • Phosphate-Containing Compound Metabolic Process
  • Regulation Of Bone Mineralization
  • Riboflavin Metabolic Process
  • Sequestering Of Triglyceride

Drug Bank:

  • Ribavirin
  • Amifostine
*synonyms

Synonyms/Aliases/Alternative Names of the Gene:

hypothetical protein| A306_08549| alkaline phosphodiesterase 1| ARHR2| AS28_03773| C76301| CB1_106083001| CD203c| COLED| D623_10035675| dgf| ectonucleotidase enpp1| Ectonucleotide pyrophosphatase/phosphodiesterase family member 1| Ectonucleotide pyrophosphatase/phosphodiesterase family member 3| E-NPP1| E-NPP 1| H920_11743| Ly-41| Ly-41 antigen| lymphocyte antigen 41| M6S1| M91_17858| M959_14755| membrane component, chromosome 6, surface marker 1| N300_09715| N301_15611| N302_02866| N303_15750| N306_14909| N307_10004| N308_06439| N309_06721| N310_02721| N311_02979| N320_02299| N321_13801| N324_06649| N326_01906| N328_01583| N330_05530| N331_12079| N333_03342| N334_01826| N336_00909| N339_09594| N340_10156| N341_04370| NPP1| Npps| PAL_GLEAN10018713| PANDA_012143| Pc1| PC-1| Pca| Pca-1| PCA1| Pdnp1| phosphodiesterase I/nucleotide pyrophosphatase 1| plasma-cell membrane glycoprotein 1| plasma-cell membrane glycoprotein PC-1| tiptoe walking| TREES_T100016788| ttw| twy| UY3_09335| Y1Q_027769| Y956_00359| Z169_09674| enpp1

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