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HMDB Protein ID HMDBP00008
Secondary Accession Numbers
  • 5236
Name 5'(3')-deoxyribonucleotidase, mitochondrial
  1. 5',3'-nucleotidase, mitochondrial
  2. Deoxy-5'-nucleotidase 2
  3. dNT-2
Gene Name NT5M
Protein Type Unknown
Biological Properties
General Function Involved in phosphatase activity
Specific Function Dephosphorylates specifically the 5' and 2'(3')-phosphates of uracil and thymine deoxyribonucleotides, and so protects mitochondrial DNA replication from excess dTTP. Has only marginal activity towards dIMP and dGMP.
  • Nicotinate and nicotinamide metabolism
  • Purine metabolism
  • Pyrimidine metabolism
Adenosine monophosphate + Water → Adenosine + Phosphate details
Cytidine monophosphate + Water → Cytidine + Phosphate details
Uridine 5'-monophosphate + Water → Uridine + Phosphate details
Inosinic acid + Water → Inosine + Phosphate details
Guanosine monophosphate + Water → Guanosine + Phosphate details
5-Thymidylic acid + Water → Thymidine + Phosphate details
dCMP + Water → Deoxycytidine + Phosphate details
2'-Deoxyguanosine 5'-monophosphate + Water → Deoxyguanosine + Phosphate details
Deoxyadenosine monophosphate + Water → Deoxyadenosine + Phosphate details
beta-nicotinamide D-ribonucleotide + Water → Nicotinamide riboside + Phosphate details
Xanthylic acid + Water → Xanthosine + Phosphate details
Nicotinic acid mononucleotide + Water → Nicotinate D-ribonucleoside + Phosphate details
GO Classification
Biological Process
pyrimidine nucleobase metabolic process
pyrimidine nucleoside catabolic process
DNA replication
pyrimidine deoxyribonucleotide catabolic process
dUMP catabolic process
Cellular Component
mitochondrial matrix
hydrolase activity, acting on ester bonds
catalytic activity
hydrolase activity
phosphoric ester hydrolase activity
phosphatase activity
Molecular Function
5'-nucleotidase activity
metal ion binding
nucleotide binding
Cellular Location
  1. Mitochondrion
Gene Properties
Chromosome Location Not Available
Locus Not Available
Gene Sequence
>687 bp
Protein Properties
Number of Residues 228
Molecular Weight Not Available
Theoretical pI Not Available
Pfam Domain Function
Signals Not Available
Transmembrane Regions Not Available
Protein Sequence
>5'(3')-deoxyribonucleotidase, mitochondrial
GenBank ID Protein Not Available
UniProtKB/Swiss-Prot ID Q9NPB1
UniProtKB/Swiss-Prot Entry Name NT5M_HUMAN
GenBank Gene ID AF210652
GeneCard ID NT5M
GenAtlas ID NT5M
General References
  1. Gerhard DS, Wagner L, Feingold EA, Shenmen CM, Grouse LH, Schuler G, Klein SL, Old S, Rasooly R, Good P, Guyer M, Peck AM, Derge JG, Lipman D, Collins FS, Jang W, Sherry S, Feolo M, Misquitta L, Lee E, Rotmistrovsky K, Greenhut SF, Schaefer CF, Buetow K, Bonner TI, Haussler D, Kent J, Kiekhaus M, Furey T, Brent M, Prange C, Schreiber K, Shapiro N, Bhat NK, Hopkins RF, Hsie F, Driscoll T, Soares MB, Casavant TL, Scheetz TE, Brown-stein MJ, Usdin TB, Toshiyuki S, Carninci P, Piao Y, Dudekula DB, Ko MS, Kawakami K, Suzuki Y, Sugano S, Gruber CE, Smith MR, Simmons B, Moore T, Waterman R, Johnson SL, Ruan Y, Wei CL, Mathavan S, Gunaratne PH, Wu J, Garcia AM, Hulyk SW, Fuh E, Yuan Y, Sneed A, Kowis C, Hodgson A, Muzny DM, McPherson J, Gibbs RA, Fahey J, Helton E, Ketteman M, Madan A, Rodrigues S, Sanchez A, Whiting M, Madari A, Young AC, Wetherby KD, Granite SJ, Kwong PN, Brinkley CP, Pearson RL, Bouffard GG, Blakesly RW, Green ED, Dickson MC, Rodriguez AC, Grimwood J, Schmutz J, Myers RM, Butterfield YS, Griffith M, Griffith OL, Krzywinski MI, Liao N, Morin R, Palmquist D, Petrescu AS, Skalska U, Smailus DE, Stott JM, Schnerch A, Schein JE, Jones SJ, Holt RA, Baross A, Marra MA, Clifton S, Makowski KA, Bosak S, Malek J: The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). Genome Res. 2004 Oct;14(10B):2121-7. [PubMed:15489334 ]
  2. Rampazzo C, Gallinaro L, Milanesi E, Frigimelica E, Reichard P, Bianchi V: A deoxyribonucleotidase in mitochondria: involvement in regulation of dNTP pools and possible link to genetic disease. Proc Natl Acad Sci U S A. 2000 Jul 18;97(15):8239-44. [PubMed:10899995 ]
  3. Rinaldo-Matthis A, Rampazzo C, Reichard P, Bianchi V, Nordlund P: Crystal structure of a human mitochondrial deoxyribonucleotidase. Nat Struct Biol. 2002 Oct;9(10):779-87. [PubMed:12352955 ]