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- W2006074652 abstract "Members of the ecto-nucleoside triphosphate diphosphohydrolase (eNTPDase) family exhibit distinctive substrate specificities, but how such specificities are achieved by enzymes with identical putative catalytic domains is unknown. Previously we showed that H59G substitution changes CD39 from an apyrase to an adenosine diphosphatase (ADPase) in a manner that depends on intact associations of both transmembrane domains with the membrane. Here we show that the extracellular domain of CD39L1 ecto-adenosine triphosphatase (ecto-ATPase) has the same 3:1 ATP:ADP hydrolysis ratio as the extracellular domain of CD39, suggesting that the transmembrane domains are required to confer the native substrate specificities on each enzyme. As in CD39, H50G substitution has little effect on the activity of the CD39L1 extracellular domain or solubilized monomers. However, H50G substitution diminishes both ATPase and ADPase activities of native CD39L1, in contrast to its selective effect on ATPase activity in CD39, suggesting that the transmembrane domains confer different ADP hydrolysis mechanisms on CD39 and CD39L1. We then show that the transmembrane domains of CD39L1 can substitute for those of CD39 in conferring native CD39 substrate specificity and regulation of H59 but that the transmembrane domains of CD39 confer neither CD39 nor CD39L1 properties on the CD39L1 extracellular domain. These results suggest that non-apyrase conserved region residues in the extracellular domain contain the information specifying CD39 native properties but have a nonspecific requirement for two transmembrane domains to manifest the information." @default.
- W2006074652 created "2016-06-24" @default.
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- W2006074652 date "2002-01-12" @default.
- W2006074652 modified "2023-10-15" @default.
- W2006074652 title "Transmembrane Domains Confer Different Substrate Specificities and Adenosine Diphosphate Hydrolysis Mechanisms on CD39, CD39L1, and Chimeras" @default.
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- W2006074652 doi "https://doi.org/10.1021/bi015563h" @default.
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