Pervanadate induces Mammalian Ste20 Kinase 3 (MST3) tyrosine phosphorylation.
MST3 activity is independent of tyrosine phosphorylation in intact cells.
The Triton concentration and ionic strength of the buffer influence the sensitivity of MST3 activity.
Tyrosine-phosphorylated MST3 may facilitate adaptor recruitment for subsequent signaling.