Nucleoside diphosphate phosphatase ENTPD5
Definition:
Hydrolyzes nucleoside diphosphates with a preference for GDP, IDP and UDP compared to ADP and CDP. In the lumen of the endoplasmic reticulum, hydrolyzes UDP that acts as an end-product feedback inhibitor of the UDP-Glc:glycoprotein glucosyltransferases. UMP can be transported back by an UDP-sugar antiporter to the cytosol where it is consumed to regenerate UDP-glucose. Therefore, it positively regulates protein reglucosylation by clearing UDP from the ER lumen and by promoting the regeneration of UDP-glucose. Protein reglucosylation is essential to proper glycoprotein folding and quality control in the ER (By similarity).
References:
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[1]. J J Mulero, et al. CD39-L4 is a secreted human apyrase, specific for the hydrolysis of nucleoside diphosphates. J Biol Chem. 1999 Jul 16;274(29):20064-7. [Content Brief]
[2]. Deirdre M Murphy-Piedmonte, et al. Bacterial expression, folding, purification and characterization of soluble NTPDase5 (CD39L4) ecto-nucleotidase. Biochim Biophys Acta. 2005 Mar 14;1747(2):251-9. [Content Brief]
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