翻訳と辞書
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・ Nucleoside-diphosphatase
・ Nucleoside-diphosphate kinase
・ Nucleoside-phosphate kinase
・ Nucleoside-specific porin
・ Nucleoside-triphosphatase
・ Nucleoside-triphosphate diphosphatase
・ Nucleoside-triphosphate-aldose-1-phosphate nucleotidyltransferase
・ Nucleoside-triphosphate-hexose-1-phosphate nucleotidyltransferase
・ Nucleoside-triphosphate—adenylate kinase
・ Nucleosides, Nucleotides & Nucleic Acids
・ Nucleosome
・ Nucleosome positioning region database
・ Nucleosome Repeat Length
・ Nucleosynthesis
・ Nucleosys
Nucleotidase
・ Nucleotide
・ Nucleotide diphosphatase
・ Nucleotide diphosphokinase
・ Nucleotide diversity
・ Nucleotide exchange factor
・ Nucleotide excision repair
・ Nucleotide phosphatase
・ Nucleotide Pyrophosphatase/Phosphodiesterase (NPP)
・ Nucleotide salvage
・ Nucleotide sugar
・ Nucleotide sugars metabolism
・ Nucleotide universal IDentifier
・ Nucleotidyltransferase
・ Nucleotomy


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Nucleotidase : ウィキペディア英語版
Nucleotidase
A nucleotidase is a hydrolytic enzyme that catalyzes the hydrolysis of a nucleotide into a nucleoside and a phosphate. For example, it converts adenosine monophosphate to adenosine, and guanosine monophosphate to guanosine.
Nucleotidases have an important function in digestion in that they break down consumed nucleic acids.
They can be divided into two categories, based upon the end that is hydrolyzed:
* : 5'-nucleotidase - , , , ,
* : 3'-nucleotidase -
5'-Nucleotidases cleave off the phosphate from the 5' end of the sugar moiety. They can be classified into various kinds depending on their substrate preferences and subcellular localization. Membrane-bound 5'-nucleotidases display specificity toward adenosine monophosphates and are involved predominantly in the salvage of preformed nucleotides and in signal transduction cascades involving purinergic receptors. Soluble 5'-nucleotidases are all known to belong to the haloacid dehalogenase superfamily of enzymes, which are two domain proteins characterised by a modified Rossman fold as the core and variable cap or hood. The soluble forms are further subclassified based on the criterion mentioned above. mdN and cdN are mitochondrial and cytosolic 5'-3'-pyrimidine nucleotidases. cN-I is a cytosolic nucleotidase(cN) characterized by its affinity toward AMP as its substrate. cN-II is identified by its affinity toward either IMP or GMP or both. cN-III is a pyrimidine 5'-nucleotidase. 5'-Nucleotidases are involved in varied functions like cell-cell communication, nucleic acid repair, purine salvage pathway for the synthesis of nucleotides, signal transduction, membrane transport, etc.
== References ==

* Hunsucker, S. A., Mitchell, B. S. and Spychala, J. (2005). "The 5'-nucleotidases as regulators of nucleotide and drug metabolism". ''Pharmacol. Ther.'' 107, 1–30.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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