TMP, (d)UMP, uridine 2' monophosphate, or uridine 3'-monophosphate + H2O => thymidine, deoxyuridine, or uridine + orthophosphate [NT5M]

Stable Identifier
Reaction [transition]
Homo sapiens
Locations in the PathwayBrowser
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5'3'-Nucleotidase, mitochondrial (NT5M) is the major nucleotidase of human mitochondria, catalyzing the hydrolysis of TMP, uridine 2'-, 3'-, and 5'-monophosphates, and dUMP to yield the corresponding (deoxy)nucleosides and orthophosphate. It may play a central role in "substrate cycles" to regulate mitochondrial deoxynucleotide levels, especially in non-dividing cells (Rampazzo et al. 2000; Gallinaro et al. 2002). The active form of the enzyme is a homodimer, with an absolute requirement for Mg++ (Rampazzo et al. 2000; Rinaldo-Matthis et al. 2002).

Literature References
PubMed ID Title Journal Year
12124385 Human mitochondrial 5'-deoxynucleotidase. Overproduction in cultured cells and functional aspects

Crovatto, K, Pontarin, G, Bianchi, V, Reichard, PA, Ferraro, P, Gallinaro, L, Milanese, E, Rampazzo, C

J Biol Chem 2002
12352955 Crystal structure of a human mitochondrial deoxyribonuclease

Bianchi, V, Reichard, PA, Rinaldo-Matthis, A, Nordlund, P, Rampazzo, C

Nt Struct Biol 2002
10899995 A deoxynucleotidase in mitochondria: involvement in regulation of dNTP pools and possible link to genetic disease

Bianchi, V, Reichard, PA, Frigimelica, E, Gallinaro, L, Milanese, E, Rampazzo, C

Proc Natl Acad Sci USA 2000
Catalyst Activity

5'-nucleotidase activity of NT5M dimer [mitochondrial matrix]

Orthologous Events
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