DGUOK

In mammalian cells, the phosphorylation of purine deoxyribonucleosides is mediated predominantly by two deoxyribonucleoside kinases, cytosolic deoxycytidine kinase and mitochondrial deoxyguanosine kinase. The protein encoded by this gene is responsible for phosphorylation of purine deoxyribonucleosides in the mitochondrial matrix. In addition, this protein phosphorylates several purine deoxyribonucleoside analogs used in the treatment of lymphoproliferative disorders, and this phosphorylation is critical for the effectiveness of the analogs. Alternative splice variants encoding different protein isoforms have been described for this gene. [provided by RefSeq]

Full Name

deoxyguanosine kinase

Function

Phosphorylates deoxyguanosine and deoxyadenosine in the mitochondrial matrix, with the highest efficiency for deoxyguanosine (PubMed:8692979, PubMed:8706825, PubMed:11687801, PubMed:17073823, PubMed:23043144).

In non-replicating cells, where cytosolic dNTP synthesis is down-regulated, mtDNA synthesis depends solely on DGUOK and TK2. Phosphorylates certain nucleoside analogs (By similarity).

Widely used as target of antiviral and chemotherapeutic agents.

Biological Process

ATP biosynthetic process Source: Ensembl
dGTP metabolic process Source: Ensembl
Guanosine metabolic process Source: ProtInc
Mitochondrial ATP synthesis coupled electron transport Source: Ensembl
Negative regulation of neuron projection development Source: Ensembl
Protein phosphorylation Source: Ensembl
Purine-containing compound salvage Source: Reactome
Purine deoxyribonucleoside metabolic process Source: UniProtKB

Cellular Location

Mitochondrion

Involvement in disease

Mitochondrial DNA depletion syndrome 3 (MTDPS3):
A disorder due to mitochondrial dysfunction characterized by onset in infancy of progressive liver failure, hypoglycemia, increased lactate in body fluids, and neurologic abnormalities including hypotonia, encephalopathy, peripheral neuropathy. Affected tissues show both decreased activity of the mtDNA-encoded respiratory chain complexes and mtDNA depletion.
Portal hypertension, non-cirrhotic (NCPH):
An autosomal recessive disorder characterized by portal hypertension associated with hepatosplenomegaly, in absence of cirrhosis, extrahepatic diseases, and splanchnic venous thrombosis. Portal hypertension is defined by a portal venous system pressure that is at least 5 mm Hg higher than the pressure in the inferior vena cava. High pressure in the portal venous system leads to shunting of blood through vessels that are poorly suited to carrying large blood volumes, resulting in collateral circulation and splenomegaly. NCPH patients show normal liver function.
Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal recessive 4 (PEOB4):
A form of progressive external ophthalmoplegia, a mitochondrial myopathy characterized by progressive paralysis of the levator palpebrae, orbicularis oculi, and extraocular muscles. PEOB4 patients manifest clinically variable features including mitochondrial myopathy with or without progressive external ophthalmoplegia, recurrent rhabdomyolysis, and adult-onset lower motor neuron syndrome with mild cognitive impairment.