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Full-length rhTOPK was expressed by baculovirus in Sf9 insect cells using an N-terminal GST tag. TOPK is a MAPK kinase that phosphorylates p38 MAPK and is activated in a cell-cycle-dependent manner in neuronal progenitor cells in vitro. Expression of TOPK is detected in male germ line progenitor cells, activated T-cells and a variety of lymphomas and leukemias. In vitro studies have shown that activated TOPK phosphorylates p38 MAPK but not JNK or ERK. TOPK activation requires phosphorylation by both the M-phase CDK1/CyclinB kinase complex and another unknown kinase, possibly Raf C or Raf A. TOPK may play an important role in linking extracellular signals to an intracellular state, possibly allowing extracellular influence on the cell-cycle-related processes of proliferation or differentiation. Contains: TOPK, 10ug (Human, recombinant full-length). MW: ~68kDa. Substrate: Native Swine Myelin Basic Protein. Reaction Buffer, DTT. TOPK NCBI Database Entry: www.ncbi.nlm.nih.gov/gene/55872/.
