Article: Research from New York University in the area of enzyme research described.

According to recent research published in the journal Molecular Biology of the Cell, "The Ca2+-activated K+ channel KCa3.1 is required for Ca2+ influx and the subsequent activation of T-cells. We previously showed that nucleoside diphosphate kinase beta (NDPK-B), a mammalian histidine kinase, directly phosphorylates and activates KCa3.1 and is required for the activation of human CD4 T lymphocytes."

"We now show that the class II phosphatidylinositol 3 kinase C2 beta (PI3K-C2 beta) is activated by the T-cell receptor (TCR) and functions upstream of NDPK-B to activate KCa3.1 channel activity. Decreased expression of PI3K-C2 beta by siRNA in human CD4 T-cells ...

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