NTPDase4 (UDPase), encoded by the ENTPD4 gene, is an E-NTPDase family member that localizes to the Golgi membrane and can hydrolyze nucleoside triphosphates UTP, GTP, CTP and TTP to nucleoside diphosphates UDP, GDP, CDP and TDP, respectively, in the Golgi lumen. NTPDase4 hydrolyzes nucleoside triphosphates less efficiently than nucleoside diphosphates. Ca2+ is needed for NTPDase4 activity (Wang and Guidotti 1998).
Guidotti, G, Wang, TF
nucleoside-triphosphatase activity of NTPDase4:Ca2+ [Golgi membrane]
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