STK38 (also known as NDR) or Nuclear Dbf2-related protein is a serine/threonine kinase in the subgroup of the AGC kinase family that is regulated by Mob proteins. Fas and TNFα receptor stimulation activates human STK38 by promoting phosphorylation at the hydrophobic motif. NDR acts as a novel pro-apoptotic kinase, and is a key member of the RASSF1A/MST1 signaling cascade. STK38 is crucial for the fidelity of mitotic chromosome alignment in mammalian cells. STK38 is incorporated into the HIV-1 particles and is cleaved by the HIV-1 protease. STK38-driven centrosome duplication requires Cdk2 activity, and Cdk2-induced centrosome amplification is affected upon reduction of STK38 activity. Full-length recombinant human STK38 was expressed by baculovirus in Sf9 insect cells using an N-terminal GST tag.

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